Окиснення циклічних кетонів H2O2, каталізоване координаційними полімерами Cu(II) та Fe(III)

It has been shown that the oxidation of ketones – analogs of cyclohexanone – by hydrogen peroxide in the presence of Cu3(btc)2 (btc3- = 1,3,5-benzenetricarboxylate) occurred mainly by the radical mechanism, rather than by the Baeyer-Villiger reaction mechanism, and led to a mixture of products forme...

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Опубліковано в:Журнал органічної та фармацевтичної хімії
Дата:2025
Том:22
Випуск:4
Сторінки:25-35
ISSN:2518-1548
Автори та афіліації:
  • Emir N. Abdullayev — L.V. Pisarzhevsky Institute of Physical Chemistry of the National Academy of Sciences of Ukraine
  • Andrii M. Mishura — L.V. Pisarzhevsky Institute of Physical Chemistry of the National Academy of Sciences of Ukraine
  • Ievgenii A. Iermolenko — Enamine Ltd.; Institute of Organic Chemistry of the National Academy of Sciences of Ukraine
  • Anton S. Lytvynenko — L. V. Pisarzhevsky Institute of Physical Chemistry of the National Academy of Sciences of Ukraine
  • Maksim O. Kolosov — V. N. Karazin Kharkiv National University — ORCID: 0009-0009-3509-5752
  • Olena G. Shvets — V. N. Karazin Kharkiv National University
  • Kostyantyn S. Gavrilenko — Enamine Ltd.; Taras Shevchenko National University of Kyiv
  • Sergiy V. Kolotilov — L. V. Pisarzhevsky Institute of Physical Chemistry of the National Academy of Sciences of Ukraine
Автори: Abdullayev, Emir N., Mishura, Andrii M., Iermolenko, Ievgenii A., Lytvynenko, Anton S., Kolosov, Maksim O., Shvets, Olena G., Gavrilenko, Kostyantyn S., Kolotilov, Sergiy V.
Формат: Стаття
Мова:Англійська
Опубліковано: National University of Pharmacy 2025
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Назва журналу:Journal of Organic and Pharmaceutical Chemistry
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Journal of Organic and Pharmaceutical Chemistry
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author Abdullayev, Emir N.
Mishura, Andrii M.
Iermolenko, Ievgenii A.
Lytvynenko, Anton S.
Kolosov, Maksim O.
Shvets, Olena G.
Gavrilenko, Kostyantyn S.
Kolotilov, Sergiy V.
author_facet Abdullayev, Emir N.
Mishura, Andrii M.
Iermolenko, Ievgenii A.
Lytvynenko, Anton S.
Kolosov, Maksim O.
Shvets, Olena G.
Gavrilenko, Kostyantyn S.
Kolotilov, Sergiy V.
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author_orcid_str_mv 0009-0009-3509-5752
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container_title Журнал органічної та фармацевтичної хімії
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description It has been shown that the oxidation of ketones – analogs of cyclohexanone – by hydrogen peroxide in the presence of Cu3(btc)2 (btc3- = 1,3,5-benzenetricarboxylate) occurred mainly by the radical mechanism, rather than by the Baeyer-Villiger reaction mechanism, and led to a mixture of products formed due to the ring cleavage and reduction of the hydrocarbon chain length. Unlike aliphatic ketones, α-tetralone hardly underwent conversion in the reaction with H2O2 in the presence of HKUST-1, and the oxidation of the same ketone in the presence of Fe2(OH)3(btc) led to the formation of a number of products; among them, 1,4-naphthoquinone was dominant.
doi_str_mv 10.24959/ophcj.24.315358
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fulltext ISSN 2308-8303 (Print) / 2518-1548 (Online) 25 Original Research http://ophcj.nuph.edu.ua UDC 544.47:547-31/-39:54-39 E. N. Abdullayev1, A. M. Mishura1, I. A. Iermolenko2,3, A. S. Lytvynenko1, M. A. Kolosov4, E. G. Shvets4, K. S. Gavrilenko2,5, S. V. Kolotilov1 1 L. V. Pisarzhevsky Institute of Physical Chemistry of the National Academy of Sciences of Ukraine, 31 Nauky ave., 03028 Kyiv, Ukraine 2 Enamine Ltd., 78 Winston Churchill str., 02094 Kyiv, Ukraine 3 Institute of Organic Chemistry of the National Academy of Sciences of Ukraine, 5, Academician Kukhar str., 02098 Kyiv, Ukraine 4 V. N. Karazin Kharkiv National University, School of Chemistry, 4 Svobody sq., 61022 Kharkiv, Ukraine 5 Taras Shevchenko National University of Kyiv, 12 Pavlo Skoropadskyi str., 01033 Kyiv, Ukraine The Oxidation of Cyclic Ketones by H2O2 Catalyzed by Cu(II) and Fe(III) Coordination Polymers Abstract It has been shown that the oxidation of ketones – analogs of cyclohexanone – by hydrogen peroxide in the presence of Cu3(btc)2 (btc3– = 1,3,5-benzenetricarboxylate) occurred mainly by the radical mechanism, rather than by the Baeyer-Villiger reaction mechanism, and led to a mixture of products formed due to the ring cleavage and reduction of the hydrocarbon chain length. Unlike aliphatic ketones, α-tetralone hardly underwent conversion in the reaction with H2O2 in the presence of HKUST-1, and the oxidation of the same ketone in the presence of Fe2(OH)3(btc) led to the formation of a number of prod- ucts; among them, 1,4-naphthoquinone was dominant. Keywords: catalytic oxidation; cyclic ketones; hydrogen peroxide; porous coordination polymers; copper(II); iron(III) Е. Н. Абдуллаєв1, А. М. Мішура1, Є. А. Єрмоленко2,3, А. С. Литвиненко1, М. О. Колосов4, О. Г. Швець4, К. С. Гавриленко2,5, С. В. Колотілов1 1 Інститут фізичної хімії ім. Л. В. Писаржевського Національної академії наук України, просп. Науки, 31, м. Київ, 03028, Україна 2 ТОВ НВП «Єнамін», вул. Вінстона Черчилля, 78, м. Київ, 02094, Україна 3 Інститут органічної хімії Національної академії наук України, вул. Академіка Кухаря, 5, м. Київ, 02660, Україна 4 Харківський національний університет імені В. Н. Каразіна, майдан Свободи, 4, м. Харків, 61022, Україна 5 Київський національний університет імені Тараса Шевченка, вул. Володимирська, 60, м. Київ, 01033, Україна Окиснення циклічних кетонів H2O2, каталізоване координаційними полімерами Cu(II) та Fe(III) Анотація З’ясовано, що окиснення кетонів – аналогів циклогексанону – перекисом водню в присутності Cu3(btc)2 (btc3– = 1,3,5-бензолтрикарбоксилат) проходило переважно за радикальним механізмом, а не за механізмом реакції Баєра- Віллігера, і призводило до суміші продуктів, що утворювалися внаслідок розщеплення кільця та зменшення довжини вуглеводневого ланцюга. На відміну від аліфатичних кетонів, α-тетралон майже не вступав у реакцію з H2O2 в присут- ності HKUST-1, а окиснення цього кетону в присутності Fe2(OH)3(btc) призводило до утворення низки продуктів, серед яких домінував 1,4-нафтохінон. Ключові слова: каталітичне окиснення; циклічні кетони; пероксид водню; пористі координаційні полімери; мідь(II); залізо(III) ISSN 2308-8303 (Print) / 2518-1548 (Online) 26 Журнал органічної та фармацевтичної хімії 2024, 22 (4) Citation: Abdullayev, E. N.; Mishura, A. M.; Iermolenko, I. A.; Lytvynenko, A. S.; Kolosov, M. A.; Shvets, E. G.; Gavrilenko, K. S.; Kolotilov, S. V. The oxidation of cyclic ketones by H2O2 catalyzed by Cu(II) and Fe(III) coordination polymers Journal of Organic and Pharmaceutical Chemistry 2024, 22 (4), 25 – 35. https://doi.org/10.24959/ophcj.24.315358 Received: 29 September 2024; Revised: 27 November 2024; Accepted: 10 December 2024 Copyright© 2024, E. N. Abdullayev, A. M. Mishura, I. A. Iermolenko, A. S. Lytvynenko, M. A. Kolosov, E. G. Shvets, K. S. Gavrilenko, S. V. Kolotilov. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0). Funding: The authors received no specific funding for this work. Conflict of interests: The authors have no conflict of interests to declare. ■ Introduction Oxidation reactions have been widely used in both high-volume organic industry (for exam- ple, manufacturing of dicarboxylic acids to pro- duce plastics) and in fine organic synthesis for the preparation of substances for pharmaceuti- cals (active pharmaceutical ingredients, APIs) and agrochemistry [1 – 3]. Many currently used methods of organic compounds oxidation involve the application of toxic catalysts based on plati- num group metals [4, 5] or oxidizing agents, which contain toxic metals (chromium, manga- nese, osmium) and, hence, produce toxic wastes [6 – 8]. Residual impurities formed from reagents or catalysts can also cause contamination of the products, which is critical for the production of APIs. For example, the content of platinum me- tals in the substance in some cases should not exceed 10–6  % by weight [9]. The development of new environmentally friendly methods for the oxidation of organic compounds and studies of the pathways of such processes are the tasks of modern organic and physical chemistry. The problem of generating large amounts of waste during oxidation can be solved using en- vironmentally friendly oxidants, such as hydro- gen peroxide, which produces water and oxygen (in the side reaction of decomposition of H2O2) [10, 11]. At the same time, the widespread use of hydrogen peroxide as an oxidant in organic chemistry is limited because of the formation of an unpredictable mixture of products due to mul- tiple parallel processes and/or different mecha- nisms, which can occur simultaneously [11, 12]. Nevertheless, there are many examples of the successful use of H2O2 for the selective oxidation of organic compounds in literature. High selec- tivity is achieved when the reaction proceeds by a single mechanism, unlike radical oxidation. For example, the oxidation of ketones by the Baeyer- Villiger mechanism in the presence of metal-con- taining catalysts usually leads to lactones with high yields [13 – 18]. In contrast, it has been found that hydrogen peroxide can decompose in the pre- sence of Cu3(btc)2 (btc3– is 3,5-benzenetricarboxylate), forming OH radicals, which cause deep oxidation of organic molecules and the formation of a mix- ture of products [19]. It has been noted that ·OH ra- dical is one of the most potent oxidants. Thus, the study of the conditions under which the oxidation reaction involving H2O2 proceeds by the Baeyer- Villiger or radical mechanism is a problem of high importance for selecting catalysts and de- termining the scope of their application. The use of porous coordination polymers (PCP) of the 3d metals as catalysts is of particular in- terest since these compounds may have high ca- talytic performance in oxidation processes [12, 20], and their selectivity can be associated with dif- ferences in the sorption capacity of PCP with respect to reagents [21 – 23]. In addition, the use of PCP allows one to carry out reactions in a he- terogeneous catalytic mode; this feature signifi- cantly simplifies the purification of products from the catalyst (transition metal ions) and makes possible a simple reuse of the catalyst or trans- fer of the reaction to the flow mode. The aim of the study was to determine the catalytic properties of two well-known PCPs – 1,3,5-benzenetricarboxylates (btc3–, also known as an anion of trimesic acid) of copper(II) (known as HKUST-1 [24]) and iron(III) [25] – in the process of cyclic ketone oxidation with hyd- rogen peroxide, and to determine their place among the catalysts used for the oxidation of organic compounds with hydrogen peroxide. The PCPs Cu3(btc)2 and Fe(btc) are widely used and are ma- nufactured and distributed under trademarks Basolite® C300 and Basolite® F300, respectively. Though the synthesis of the first compound is simple and straightforward, the second one usu- ally forms species with a high hydroxide content and corresponds to formula Fe2(OH)3(btc). The use of these PCP made it possible to compare the ca- talytic activity of compounds containing metal ions with different Lewis acidity [26] and oxida- tive capacity [27]. The study used 1,2,3,4-tetrahydro-1-naphtha- lenone (I, α-tetralone) as a carbocyclic ketone. This compound is similar to industrially im- portant cyclohexanone, but less volatile. It has ISSN 2308-8303 (Print) / 2518-1548 (Online) 27 Journal of Organic and Pharmaceutical Chemistry 2024, 22 (4) a simpler NMR spectrum and can be easily ana- lyzed by chromatography without modification. To reveal the peculiarities of oxidation of orga- nic compounds containing several sensitive to oxi- dation fragments, other ketones, including ethyl 4-oxocyclohexane-1-carboxylate (II), tert-butyl 4-oxo- piperidine-1-carboxylate (III), tetrahydro-4H- pyran-4-one (IV), were also studied (Figure 1). ■ Materials and methods Cu3(btc)2 and Fe2(OH)3(btc) were obtained by anodic dissolution of the corresponding metals in a solution of 1,3,5-benzenetricarboxylic acid. The method of obtaining Cu3(btc)2 was described earlier [28]. Fe2(OH)3(btc) was obtained by mod- ification of the known method [29]. Two prelimi- narily cleaned iron rods with a diameter of 2 mm were immersed in a beaker with the electrolyte (0.5 g Bu4NBF4 and 0.2 g H3btc in 20 mL of etha- nol) and 3 F of electricity per 1 mol of trimesic acid was passed through the solution at a tempera- ture of 32 ºC and a current density of 3.8 A dm–2. The contact area of iron with the electrolyte was 107 mm2, current – 40 mA, electrolysis time – 2.2 h. During the reaction, the air was blown through the electrolyte with a peristaltic pump throughout the electrolysis and for an additional 2.5 h after its completion. The reaction mixture was then stirred for 12 h. A beige precipitate fell out during the process, which gradually turned light red. After the process, the precipitate was filtered off, washed with water, and dried at 70 – 80 ºC. The CHN analysis: calculated for Fe2(OH)3(btc)(H2O)1,3: C9H8.6O10.3Fe2, %: C 27.50; H 2.20; found C 27.60; H 2.52. Powder diffraction patterns of the coordina- tion polymers were measured using a DRON-3M X-ray diffractometer, Cu-Kα radiation in the ran- ge of angles 2θ = 5 – 80° with a step of 2θ = 0.05°. The transmission electron microscopy studies were performed using a PEM-125K SELMI mi- croscope with an accelerating voltage of 100 kV. Test samples in the form of alcohol suspensions were applied to copper mesh covered with a film of amorphous carbon and then dried. The CHN analysis was performed using a CarloErba 1106 instrument. Nitrogen adsorption isotherms were measured by the volumetric method using a Sorptomatic 1990 instrument. Optical micro- graphs were obtained using an XY-B2 trinocu- lar microscope (Ningbo Sunny Instruments Co., Ltd., PRC) equipped with the attached PowerShot G6 Canon camera in the mode of illumination of the sample, the light source was a lamp built into the microscope. The composition of the reac- tion mixtures in the ketone oxidation processes was determined by 1H NMR (a Bruker Advan- ce 400 spectrometer), gas chromatography with mass spectrometric detection (an Agilent 7890 A chromatograph) and in individual experiments with mass spectrometry (a Shimadzu GCMS QP- 2020 instrument using a column type HP-5 and a direct sample inlet (DI) into the ion source). Mass spectra of mixtures were obtained by the direct introduction of samples into an ion source (DI) on a Shimadzu GCMS QP-2020 in- strument (ionization energy 70 eV). In addition to DI, an attempt was made to chromatographi- cally separate mixtures of reaction products fol- lowed by the mass spectrometric detection of in- dividual substances (GCMS) using a Shimadzu GCMS QP‑2020 instrument, the carrier gas was helium (99.999 % vol.), the sample solvent – ethyl acetate, the sample volume – 1 μL, the injector temperature – 150 ºC. Column: the stationary phase was 5 % diphenylpolysiloxane, 95 % dime- thylpolysiloxane; the length – 30 m; the inner dia- meter – 0.25 mm; the thickness of the stationa- ry phase film – 0.25 μm. Column temperature control: the initial temperature was 35 ºC; the initial isotherm time – 1 min; the temperature gradient – 15 ºC min–1; the final temperature – 200 ºC; the time of the final isotherm – 5 min (the detector temperature – 200 ºС; the ioniza- tion energy – 70 eV). The NIST 17.0 database was used to assign mass spectra. Ketone oxidation experiments were perfor- med according to the method similar to that de- scribed in the literature [11]. A portion of the appropriate PCP and a portion of a ketone (con- centrations of reaction mixtures are indicated in the Results and discussion section) were added to the solution obtained by mixing acetonitrile with aqueous hydrogen peroxide. In most cases the solutions were prepared by mixing 40 mL of acetonitrile with 7 mL of 35 % aqueous solution of H2O2 (d = 1.1 g cm–1); the solution obtained con- tained 1.7 M H2O2 and 5.9 M water. The resulting O O N Boc O O O COOEt I II III IV Figure 1. Ketones studied in this work ISSN 2308-8303 (Print) / 2518-1548 (Online) 28 Журнал органічної та фармацевтичної хімії 2024, 22 (4) suspension was stirred at 25 °C for 24 h on a mag- netic stirrer. After standing for a certain time, 50 mL of 1.1 M aqueous Na2SO3 solution was added to the reaction mixture, the organic com- pounds were extracted with ethyl acetate (2 por- tions of 75 mL), the extracts were dried over sodium sulfate, and the solvents were removed on a rota- ry evaporator under reduced pressure. The reac- tion products were analyzed as described above. ■ Results and discussion The powder diffraction pattern of the HKUST-1 sample obtained in this work was si- milar to the diffraction pattern of the hydrated form of copper(II) benzenetricarboxylate Cu3(btc)2(H2O)3 · xH2O [30]. In contrast, there were no distinct reflections on the diffraction pat- tern of the coordination polymer Fe2(OH)3(btc), which was a sign of a disordered structure. The results obtained are in good agreement with the literature – copper(II) 1,3,5-benzen- etricarboxylate is almost always characterized by a well-defined crystalline structure, while iron(III) 1,3,5-benzenetricarboxylate, according to X-ray diffraction, is usually referred to as a material with low crystallinity or even amor- phous one [31]. The TEM studies showed that the HKUST-1 sample mainly consisted of particles of ca. 0.5 μm size (Figure 2, a). The particle size of Fe2(OH)3(btc), determined by optical microsco- py, was 0.7 – 0.8 μm (Figure 2, c). Particles of Fe2(OH)3(btc) were unstable in the electron beam of TEM. According to nitrogen adsorption data, HKUST-1 was characterized by the value of SBET = 1435 m2 g–1, the volume of micropores ac- cording to the Dubinin-Radushkevich equation VDR was equal to 0.533 cm3 g–1 [28]. In the case of Fe2(OH)3(btc) the value of SBET was 520 m2 g–1, the volume of micropores according to the Dubinin- Radushkevich equation was VDR = 0.196 cm3 g–1. The distribution of pores by size was calculat- ed using the Saito-Foley method, the sample Fe2(OH)3(btc) had dominating pores size with a diameter of 1.0 nm, and there were pores with a diameter of 1.2 – 1.4 nm. The values of SBET and Figure 2. Images of HKUST-1 obtained by TEM (a) and optical microscopy (b), the image of Fe2(OH)3(btc), obtained by optical microscopy (c) and nitrogen adsorption isotherm of PCP Fe2(OH)3(btc) (d) ISSN 2308-8303 (Print) / 2518-1548 (Online) 29 Journal of Organic and Pharmaceutical Chemistry 2024, 22 (4) VDR for HKUST-1 were close to the upper limit of the range of sorption characteristics typical for these PCPs [24], and in the case of Fe2(OH)3(btc) SBET and VDR were significantly lower than the values published for similar compounds [31]. At room temperature, α-tetralone (I) was not oxidized by hydrogen peroxide in the presence of HKUST-1 (0.1 M of a ketone, 1.7 M of H2O2, 1.5·10–2 M of HKUST-1) as the organic mixture after the experiment contained almost pure star- ting ketone (hereinafter the “effective concentra- tion” of PCP in the reaction mixture is given as the ratio of the amount of PCP expressed in mo- les per 1 mol of a metal ion to the volume of the solution. The PCP is suspended as a fine solid). The interaction of I with hydrogen peroxide in the presence of HKUST-1 for 3 h at 55 ºC also did not lead to the formation of a significant amount of oxidation products: according to the gas chromatography and NMR methods, the re- action mixture contained more than 97 % of the initial ketone I, and among the minor oxidation products a lactone resulting from the Baeyer- Villiger oxidation could be identified. Upon the oxidation of I (0.14 M) with hydro- gen peroxide (1.7 M) in the presence of Fe2(OH)3(btc) (1×10–3 M) at 25 °C in 5 h, ca. 5 – 8 % of quinone was found in the results of two experiments, while about 90 % of the initial ke- tone I remained unchanged. At the same time, the formation of several products was detected by gas chromatography. These products could be attributed to the lactone or the products of the compound I hydroxylation in the aromatic core, the yield of each of these products did not exceed 2 %. Increasing the reaction time to 24 h had lit- tle effect on the formation of oxidation products. The oxidation of organic compounds in the presence of PCPs occurs on the metal ions loca- ted in pores and on the outer surface of the cata- lyst particles. Clearly, not all metal ions are ac- cessible to a substrate in this case. In order to compare the outcome of the oxidation process with the one that occurred in homogeneous con- ditions, a similar reaction was carried out in the presence of soluble copper(II) salt. In order to re- veal if there was any contribution of Lewis aci- dity of the metal ion (in contrast to possible redox activity), the oxidation in the presence of AlCl3 was tested. It was found that in a similar reac- tion of the oxidation of I in the presence of CuCl2 (0.1 M ketone, 1.7 M of H2O2, 1·10–2 M CuCl2, 24 h at 25 ºC), 95 % of the starting ketone and about 3 % of quinone were found in the reaction mixture, and when CuCl2 was replaced with an equimolar amount of AlCl3, 98 % of the starting material were found unchanged. It can be con- cluded that the low yield in the oxidation of I in the presence of HKUST-1 was associated with the intrinsic low catalytic activity of Cu2+ ions rather than their low accessibility. Moreover, the low Lewis acidity does not cause such low cata- lytic activity. The oxidation of ketones II-IV in the presence of HKUST-1 at room temperature led to the for- mation of mixtures of products at the ketone/ H2O2 ratio of 1:2 (0.05 M of ketone, 0.1 M of H2O2, 5·10–3 M of HKUST-1), as well as at a 17-fold ex- cess of H2O2 (0.1 M of II, 1.7 M H2O2, 1·10–2 M of HKUST-1). The mass spectrum (direct injec- tion of the sample into the ion source) of the reaction mixture sample obtained by the oxida- tion of II (0.1 M of II, 1.7 M of H2O2, 1·10–2 M of HKUST-1 for 24 h at 25 ºC with further process- ing) is shown in Figure 3 (a). The mass spec- trum obtained corresponds to cyclic lactone IIa (the Baeyer-Villiger oxidation product, Figure 4) and other substances that could form upon its oxidation by the radical mechanism, which led to a decrease in the carbon chain length [32]. The 1H NMR spectrum of the reaction mixture after the oxidation of II could also be interpre- ted with the assumption that the resulting mix- ture contained lactone IIa and the products of its deeper oxidation (the products were determined by comparing the positions of the signals with the calculated values; the positions of the signals in the NMR spectrum were calculated using ACD Labs 10.08 software pack program), how- ever the quantitative composition of the reaction mixture could not be determined. The possible oxidation products are shown in Figure 3 (b). The GCMS analysis of the reaction mixture obtained in the experiment of the compound II oxidation revealed at least three other compounds with longer retention times compared to II; mo- lar fractions of II and these 3 products had the ratio of 15:23:17:45. The mass spectrum of the second compound in this series corresponded to cyclohexanone IIe (Figure 3, b), which could be formed due to the hydrolysis and the subsequent decarboxylation of II. Taking into account the re- sults of several experiments conducted under dif- ferent conditions, it can be concluded that most of the oxidation products decompose on the co- lumn during chromatographic separation (the re- lease of individual portions of water and CO2 at certain intervals indicates such decomposition). ISSN 2308-8303 (Print) / 2518-1548 (Online) 30 Журнал органічної та фармацевтичної хімії 2024, 22 (4) At the same time, not all possible products, es- pecially di- and polycarboxylic acids, gave peaks in GCMS due to low volatility, the ability to re- arrange and decarboxylation, as well as the ten- dency to form multicharged ions. Thus, it can be concluded that the oxidation of II resulted in the formation of a mixture of products, in which no predominant compounds could be isolated. In a separate experiment, changes in the composition of the reaction mixture in the pro- cess of the oxidation of II (0.1 M) with hydrogen peroxide (1.7 M) in the presence of 2·10–2 M of HKUST-1 at 70 ºC were monitored. The amount of lactone IIa could be estimated by the integral intensity of peak at δ = 4.35 ppm, which corre- sponded to the CH2 group near the oxygen atom in the 7-membered lactone cycle, the amount of acid IId – by the integral intensity of the signal at δ = 3.65 ppm, which corresponded to the CH group in the malonate fragment. Taking into account that the positions of the signals of the CH3 and CH2 groups in the -CO2C2H5 fragment coincided in all oxidation products, the integral intensity of the CH2 group (δ = 4.10 – 4.14) could be considered as an indicator of the total con- tent of unreacted II and all products of its oxi- dation, except the products formed upon the hy- drolysis of the ester and subsequent reactions. The content of other possible reaction products could not be considered in this calculation since there were no signals in their spectra that did not overlap each other. It can be noted that in the period from 60 to 150 min at 70 ºC, the con- tent of lactone IIa and acid IId remained almost unchanged and was equal to 15 and 20-30 %, re- spectively (Figure 4). When the reaction time increased to 180 min, the content of lactone IIa and acid IId increased to 22 and 50 %, respec- tively (the percentage was calculated relative to the total amount of all compounds in the mixture having the ethyl group). The stable level of con- centrations of IIa and IId in the reaction mix- ture over a long period of time can be explained by similar values of the rates of the formation of these substances and subsequent oxidation and agreed well with the above conclusion about the formation of several oxidation products. The formation of lactone IIa was a conse- quence of the Baeyer-Villiger oxidation of the ketone, which took place at the acidic sites of the catalyst [4, 5]. Further oxidation occurred, most likely, by the radical mechanism, and led to a shortening of the hydrocarbon chain [12, 33]. At the same time, it should be noted that the for- mation of carboxylic acids (such as IIc and IId) could take place without the formation of lacto- ne IIa and the product of its hydrolysis IIb as intermediates. (a) O OEtO EtO O O O EtO O OH O OH + EtO O OH O OH O + EtO O O HO O OH + + OH2O2 II IIa IIb IIc IId IIe (b) Figure 3. The mass spectrum of the products of the oxidation of II by H2O2 in the presence of HKUST-1 (a) and the scheme showing the oxidation of products II (b) ISSN 2308-8303 (Print) / 2518-1548 (Online) 31 Journal of Organic and Pharmaceutical Chemistry 2024, 22 (4) The reaction of III with H2O2 in the presence of HKUST-1 under the same conditions as in the case of II (0.1 M of ketone, 1.7 M of H2O2, 1·10–2 M of HKUST-1, 24 h at 25 ºC) led to the formation of a mixture of products. The DI-mass spectrum of this mixture contained several peaks. Some of them could be assigned to 4-piperidinone and lac- tone formed upon oxidation of III and elimination of the tert-butoxycarbonyl group (Figure 5, b). The NMR spectrum of the reaction mixture con- tained signals that could be attributed to the starting material, lactone, and products of the subsequent oxidation with cleavage of the cycle, similar to the oxidation of II. It was not possible to reliably identify all the signals in the NMR spectrum, but several characteristic features of the spectrum could be noted. Thus, the spectrum of the mixture of the reaction products contained at least four signals of the tert-butyl group in the range of δ = 1.44 – 1.53 ppm instead of one signal of such a group in the starting ketone at δ = 1.45 ppm and the similar group in lactone at δ = 1.53 ppm (calculated value; signal of tert- butanol formed upon the hydrolytic cleavage of the Boc group was observed at δ = 1.28 ppm). The increase in the number of signals was an indica- tor of the formation of at least four compounds con- taining the unchanged fragment -N–C(=O)–OtBu, upon the oxidation of III. A signal at δ = 4.6 ppm could be attributed to the CH2 group near the O atom in a 7-membered lactone cycle. In addi- tion, there were new signals at δ = 8.01, 7.25 and 5.14 ppm in the spectrum of the reaction mix- ture, which could be attributed to nitrone IIIc and its tautomer IIId. The reaction of IV with H2O2 in the presence of HKUST-1 under the same conditions led to the formation of a mixture. The DI-mass spec- trum of this mixture corresponded to the lactone formed upon the Bayer-Villiger oxidation of IV (Figure 6). However, the formation of the com- pounds with a lower molecular weight could not be excluded. Higher conversions of II – IV in reactions with H2O2 compared to the conversion of I may be ex- plained by a higher reactivity of the aliphatic ketones, which is possibly due to steric effects (the presence of a bulk benzene ring near the carbonyl group in aromatic ketones) or differen- ces in the electronic structure of such ketones. A similar dependence of the conversion on the nature of the ketone was observed in the process of oxidation of ketones by H2O2 in the presence of tungsten-containing heteropolyacids [34]. The catalytic oxidation of ketones by H2O2 can occur by the Baeyer-Villiger mechanism or by the radical mechanism (Figure 7). However, a clear dependence on the nature of the catalyst can- not be found. Generally, it can be noted that the use of mild Lewis acids like Sn-, Ge-containing silicates, MoO3, or complexes of Pt(II) resulted in the Baeyer-Villiger oxidation. The same effect was also found in the case of strong Lewis acids like AlCl3. All catalysts shown on Figure 7, which fa- vored radical oxidation, contained redox-active Figure 4. The change of 1H NMR spectra of the reaction mixture in the process of oxidation of II (0.1 M) with hydrogen peroxide (1.7 M) in the presence of 2·10–2 M of HKUST-1 at 70 ºC along with the spectrum of the starting compound: (1) starting II, (2) in 60 min, (3) in 90 min, (4) in 120 min, and (5) in 150 min ISSN 2308-8303 (Print) / 2518-1548 (Online) 32 Журнал органічної та фармацевтичної хімії 2024, 22 (4) sites. However, a potentially redox-active cata- lyst Co(III) salen was found to catalyze the Baeyer- Villiger oxidation (probably, as its redox poten- tial falls out of the suitable range for generation of radicals from H2O2) [15]. Notably, the Baeyer- Villiger oxidation can be followed by the radical oxidation [35] in the presence of the same cata- lyst. The PCPs, studied herein, seem to be able to catalyze the Baeyer-Villiger oxidation, but there are evidences of radical oxidation pathway in the presence of such catalysts. Generally, soft Lewis acids are considered as the most efficient catalysts for the Bayer-Villiger oxidation [5, 36]. There are examples of the Bae- yer-Villiger ketone oxidation catalyzed by coor- dination compounds of Cu(II) [23, 37, 38] and (a) N Boc O H2O2 HKUST-1 N Boc O O N O O + N O + O N OH O + III IIIa IIIb IIIc IIId H (b) Figure 5. The mass spectrum of the products of oxidation of III by H2O2 in the presence of HKUST-1 (a) and the scheme showing products of oxidation of III (b) Figure 6. The mass spectrum of the products of oxidation of IV by H2O2 in the presence of HKUST-1 O O O Baeyer-Villiger oxidation AlCl3 [13] MoO3 [17] Ge- or Sn-silicates [16] Al-containing zeolite beta [14] Co(III)(salen) [15] Pt(II) complex with diphosphine [18] OH O HO O HO O OH O HO O OH O Deep oxidation K6P2W18O62 K6P2Mo6W12O62 K7P2Mo5VW12O62 [44] H3-2(x+y)MnxCoyPMo12O40 [45] Cu2(btc)3 [this work] Baeyer-Villiger oxidation followed by thermally activated radical reaction Titanium silicalite-1 [35] Figure 7. The catalytic oxidation of ketones by H2O2 in the presence of different catalysts ISSN 2308-8303 (Print) / 2518-1548 (Online) 33 Journal of Organic and Pharmaceutical Chemistry 2024, 22 (4) Fe(III) by oxygen [39]. Cu(OTf)2 was found to be an efficient catalyst for the Baeyer-Villiger oxi- dation of cyclic ketones by mCPBA [17]. Several Fe- and Cu-containing systems were found to be efficient catalysts of the Baeyer-Villiger oxi- dation in the O2/benzaldehyde system, such as Fe–Sn–O catalysts for the oxidation of cyclohex- anone to ε-caprolactone [40], iron(III)-contain- ing mesoporous silica (MCM-41) [41], a Cu-SiO2 catalyst with highly dispersed copper species and various metal valences for the oxidation of cyclohexanone to ε-caprolactone [42], a bifunc- tional hybrid catalyst originated from copper tetrasulfophthalocyanine (CuPcTs) and hydro- talcite [43] ■ Conclusions The oxidation of cyclohexanone analogs with hydrogen peroxide in the presence of a porous coordination polymer HKUST-1 led to the for- mation of a mixture of products containing the corresponding lactones (formed by the Baeyer- Villiger process) and other compounds formed by a deeper oxidation of the organic compounds with cleavage of the ring and reduction of the hydrocarbon chain length. Unlike aliphatic ke- tones, α-tetralone underwent almost no conver- sion in the reaction with H2O2 in the presence of HKUST-1, and the oxidation of the same ketone in the presence of Fe2(OH)3(btc) led to the for- mation of a number of products with low yields. Among them, 1,4-naphthoquinone was domi- nant (in contrast to cyclic lactone – the expected Baeyer-Villiger oxidation product). The oxida- tion of ketones in the presence of the PCPs stud- ied occurred mainly by the radical mechanism, which can be explained by insufficient Lewis acidity of Cu2+ and Fe3+ ions in the environment of oxygen atoms. ■ References 1. Valange, S.; Vedrine, J. C. General and Prospective Views on Oxidation Reactions in Heterogeneous Catalysis. Catalysts 2018, 8 (10), 483. https://doi.org/10.3390/catal8100483. 2. Trusau, K. I.; Kirillova, M. V.; André, V. A.; Usevich, I.; Kirillov, A. M. Mild Oxidative Functionalization of Cycloalkanes Catalyzed by Novel Dicopper(II) Cores. Mol. 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Abdullayev, Engineer of the Department of Porous Compounds and Materials, L. V. Pisarzhevsky Institute of Physical Chemistry of the National Academy of Sciences of Ukraine. Andrii M. Mishura, Leading Engineer of the Department of Free Radicals, L. V. Pisarzhevsky Institute of Physical Chemistry of the National Academy of Sciences of Ukraine. Ievgenii A. Iermolenko, Ph.D. Student of Institute of Organic Chemistry of the National Academy of Sciences of Ukraine; Chemist, Enamine Ltd. Anton S. Lytvynenko, Ph.D. in Chemistry, Research Fellow of the Department of Porous Compounds and Materials, L. V. Pisarzhevsky Institute of Physical Chemistry of the National Academy of Sciences of Ukraine; https://orcid.org/0000-0001-5528-9989. Maksim O. Kolosov, Ph.D. in Chemistry, Deputy Dean for Research, School of Chemistry, V. N. Karazin Kharkiv National University; https://orcid.org/0000-0002-6714-0513. Olena G. Shvets, Ph.D. in Chemistry, Junior Researcher, School of Chemistry, V. N. Karazin Kharkiv National University; https://orcid.org/0000-0003-4791-2114. Kostyantyn S. Gavrilenko, Ph.D. in Chemistry, Senior Researcher, Faculty of Chemistry, Taras Shevchenko National University of Kyiv; Manager, Enamine Ltd.; https://orcid.org/0000-0001-7487-6660. Sergiy V. Kolotilov (corresponding author), Corresponding Member of the National Academy of Sciences of Ukraine, Dr.Sci. in Chemistry, Deputy Director for Research, L. V. Pisarzhevsky Institute of Physical Chemistry of the National Academy of Sciences of Ukraine; https://orcid.org/0000-0002-4780-4378; e-mail for correspondence: s.v.kolotilov@gmail.com.
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spelling oai:ojs.journals.uran.ua:article-3153582026-08-23T15:46:26Z The Oxidation of Cyclic Ketones by H2O2 Catalyzed by Cu(II) and Fe(III) Coordination Polymers Окиснення циклічних кетонів H2O2, каталізоване координаційними полімерами Cu(II) та Fe(III) Abdullayev, Emir N. Mishura, Andrii M. Iermolenko, Ievgenii A. Lytvynenko, Anton S. Kolosov, Maksim O. Shvets, Olena G. Gavrilenko, Kostyantyn S. Kolotilov, Sergiy V. каталітичне окиснення циклічні кетони пероксид водню пористі координаційні полімери мідь(II) залізо(III) catalytic oxidation cyclic ketones hydrogen peroxide porous coordination polymers copper(II) iron(III) It has been shown that the oxidation of ketones – analogs of cyclohexanone – by hydrogen peroxide in the presence of Cu3(btc)2 (btc3- = 1,3,5-benzenetricarboxylate) occurred mainly by the radical mechanism, rather than by the Baeyer-Villiger reaction mechanism, and led to a mixture of products formed due to the ring cleavage and reduction of the hydrocarbon chain length. Unlike aliphatic ketones, α-tetralone hardly underwent conversion in the reaction with H2O2 in the presence of HKUST-1, and the oxidation of the same ketone in the presence of Fe2(OH)3(btc) led to the formation of a number of products; among them, 1,4-naphthoquinone was dominant. З’ясовано, що окиснення кетонів – аналогів циклогексанону – перекисом водню в присутності Cu3(btc)2 (btc3- = 1,3,5-бензолтрикарбоксилат) проходило переважно за радикальним механізмом, а не за механізмом реакції Байєра-Віллігера, і призводило до суміші продуктів, що утворювалися внаслідок розщеплення кільця та зменшення довжини вуглеводневого ланцюга. На відміну від аліфатичних кетонів, α-тетралон майже не вступав в реакцію з H2O2 у присутності HKUST-1, а окиснення цього кетону в присутності Fe2(OH)3(btc) призводило до утворення низки продуктів, серед яких домінував 1,4-нафтохінон. National University of Pharmacy 2025-02-19 Article Article application/pdf https://ophcj.nuph.edu.ua/article/view/315358 10.24959/ophcj.24.315358 Journal of Organic and Pharmaceutical Chemistry; Vol. 22 No. 4 (2024); 25-35 Журнал органической и фармацевтической химии; Том 22 № 4 (2024); 25-35 Журнал органічної та фармацевтичної хімії; Том 22 № 4 (2024); 25-35 2518-1548 2308-8303 en https://ophcj.nuph.edu.ua/article/view/315358/313484 Copyright (c) 2025 Emir N. Abdullayev, Andrii M. Mishura, Ievgenii A. Iermolenko, Anton S. Lytvynenko, Maksim O. Kolosov, Olena G. Shvets, Kostyantyn S. Gavrilenko, Sergiy V. Kolotilov http://creativecommons.org/licenses/by/4.0
spellingShingle каталітичне окиснення
циклічні кетони
пероксид водню
пористі координаційні полімери
мідь(II)
залізо(III)
Abdullayev, Emir N.
Mishura, Andrii M.
Iermolenko, Ievgenii A.
Lytvynenko, Anton S.
Kolosov, Maksim O.
Shvets, Olena G.
Gavrilenko, Kostyantyn S.
Kolotilov, Sergiy V.
Окиснення циклічних кетонів H2O2, каталізоване координаційними полімерами Cu(II) та Fe(III)
title Окиснення циклічних кетонів H2O2, каталізоване координаційними полімерами Cu(II) та Fe(III)
title_alt The Oxidation of Cyclic Ketones by H2O2 Catalyzed by Cu(II) and Fe(III) Coordination Polymers
title_full Окиснення циклічних кетонів H2O2, каталізоване координаційними полімерами Cu(II) та Fe(III)
title_fullStr Окиснення циклічних кетонів H2O2, каталізоване координаційними полімерами Cu(II) та Fe(III)
title_full_unstemmed Окиснення циклічних кетонів H2O2, каталізоване координаційними полімерами Cu(II) та Fe(III)
title_short Окиснення циклічних кетонів H2O2, каталізоване координаційними полімерами Cu(II) та Fe(III)
title_sort окиснення циклічних кетонів h2o2, каталізоване координаційними полімерами cu(ii) та fe(iii)
topic каталітичне окиснення
циклічні кетони
пероксид водню
пористі координаційні полімери
мідь(II)
залізо(III)
topic_facet каталітичне окиснення
циклічні кетони
пероксид водню
пористі координаційні полімери
мідь(II)
залізо(III)
catalytic oxidation
cyclic ketones
hydrogen peroxide
porous coordination polymers
copper(II)
iron(III)
url https://ophcj.nuph.edu.ua/article/view/315358
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