Thermal cis-trans rearrangement of semirigid polyenes as a model for the anticarcinogen. beta.-carotene: an all-trans-pentaene and an all-trans-heptaene

WE Doering, T Kitagawa

Index: Von Doering; Kitagawa Journal of the American Chemical Society, 1991 , vol. 113, # 11 p. 4288 - 4297

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Citation Number: 58

Abstract

Abstract To assess the possible role of a 15, 15'90-twisted, singlet diradical in the anticarcinogenicity of 8-carotene, activation parameters for the thermal, cis-trans interconversion of all-trans-@-carotene (1) and 15, 15'-cis-@-carotene (2), polyenes of order 11, are needed. Indirect achievement of this goal is initiated here by determining activation parameters for cis-trans rearrangement in a set of semirigid, all-trans-polyenes of order 3, ...