Photocyclization of terthiophenes

N Jayasuriya, J Kagan, JE Owens…

Index: Jayasuriya, Nimal; Kagan, Jacques; Owens, John E.; Kornak, Eugene P.; Perrine, Daniel M. Journal of Organic Chemistry, 1989 , vol. 54, # 17 p. 4203 - 4205

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Citation Number: 35

Abstract

The terthiophenes in which thienyl groups are attached to the 2-and 3-positions of a central thiophene ring undergo oxidative photocyclization to benzotrithiophenes. A single product, unsymmetrical benzotrithiophene 5, was obtained from 2, 2': 3 ', 2”-and 2, 2': 3', 3''- terthiophenes, and its symmetrical isomer 6 from 2, 3': 2', 3''-terthiophene. However, a mixture of these two products was produced by irradiation of 3, 2 ': 3 ', 3 “-terthiophene, ...