Reactions of Cookson's diketone with potassium halides in the polyphosphoric acid medium - O. V. Gaidai; Ye. Yu. Zhyhadlo; I. A. Levandovskiy; O. G. Sidorenko; O. V. Shishkin; S. V. Shishkina; Yu. V. Rassukana (Journal of organic and pharmaceutical chemistry, 2020)