Synthesis of new sulfur heteroaromatics isoelectronic with dibenzo [g, p] chrysene by photocyclization of thienyl-and phenyl-substituted ethenes

…, J Larsen, JB Christensen, M Fourmigué…

Index: Fischer, Erik; Larsen, Jan; Christensen, Jorn B.; Fourmigue, Marc; Madsen, Hans G.; Harrit, Niels Journal of Organic Chemistry, 1996 , vol. 61, # 20 p. 6997 - 7005

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Citation Number: 38

Abstract

A series of new sulfur heteroarenes, isoelectronic with dibenzo [g, p] chrysene, have been prepared by double photocyclization of the corresponding tetraaryl substituted ethenes. The first step proceeds efficiently in each case, and the corresponding intermediate sulfur heteroarenes, isoelectronic with phenanthrene, have been isolated. The second ring closure is only efficient when one of the participating aryl substituents is thienyl, which thus ...