Studies in Chromones and Flavones. Part XI : Synthesis of Some Bichromonyls

Chemistry Department, Faculty of Science, M. S. University of Baroda, Baroda. Manuscript received 8 November 1974; revised 8 November 1975; accepted 10 November 1975. 8, 8' -and 6, 6' -bichromonyl, 8, 8' -and 6,6' -bichromonyl methane, 6, 6'-bichromonyl ketone and 6, 6'-bichromonyl sulfone have been synthesised from 2, 2'-dihydroxy and 4, 4'-dihydroxy-biphenyl, 2, 2`. and 4, 4'-dihydroxydiphenyl methane, 4, 4' -dihydroxybenzophenone and 4, 4'-dihydroxydi­phenyl sulfone respectively through cyanoethylation, hydrolysis of the cyanoethoxy derivatives obtained to the corresponding acids, cyclisation of the acids with PPA to the bichromanonyls and their dehydrogenation. Hydrolysis of the bichromonyls with alkali gave the corresponding phe­nolic ketones