5-(2,3-DIPHENYLCYCLOPROPENYLIDENE)-2(5H)-THIOPHENONE CHARACTERIZATION OF A THIOPHENE-INSERTED TYPE COMPOUND OF DIPHENYLCYCLOPROPENONE

Article abstract of DOI:10.1016/S0040-4039(00)81366-0

The title compound 6 has been synthesized and the effect of cyclic ?-system insertion into diphenylcyclopropenone 1 has been discussed.The distribution of positive charge over the 3-membd. ring and phenyl groups slightly predominates in 6 than in parent annulenone 1, in contrast to 5-cycloheptatrienylidene-2(5H)-tiophenone 5 whose 7-membd. ring is more olefinic than parent tropone 2.Electronic spectrum of 6 exhibits a broad absorption band having a C-T character.