Tetrahedron Letters

5-(2, 3-diphenylcyclopropenylidene)-2 (5H)-thiophenone characterization of a thiophene-inserted type compound of diphenylcyclopropenone

K Takahashi, K Nishijima, K Takase, S Katagiri

Index: Takahashi, Kazuko; Nishijima, Kazumi; Takase, Kahei; Katagiri, Shigeyoshi Tetrahedron Letters, 1983 , vol. 24, # 2 p. 205 - 208

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Citation Number: 9

Abstract

Abstract The title compound 6 has been synthesized and the effect of cyclic π-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)-thiophenone 5 whose 7- membd. ring is more olefinic than parent tropone 2. Electronic spectrum of 6 exhibits a ...