作者:P.S. Mariano、D.G. Watson、E. Bay
DOI:10.1016/0040-4020(77)80425-0
日期:1977.1
di-π-methane rearrangement, producing the endo- and exo-3,7-dimethyl-8-phenybicyclo[5.1.0]oct-2-enes, and cis -trans isomerization, interconverting the 1,4-diene containing substrates. Triplet sensitized photolysis of both substituted cyclohexenes leads exclusively to cis-trans isomerization. Results from low conversion direct irradiations of the cis- and trans-β-styrylcyclohexenes indicate that the singlet
立体异构的1,3-二甲基-3-(2-苯基乙烯基)环己烯的光化学已经探索了直接照射顺式-和反式-β-styrylcyclohexenes导致二-π-甲烷重排,产生内切-和外切-3 ,1,7-二甲基-8-苯并双环[5.1.0]辛-2-烯和顺式-反式异构化,相互转化含1,4-二烯的底物。两个取代的环己烯的三重态敏化光解仅导致顺反异构化。顺式和反式低转换直接照射的结果-β-苯乙烯基环己烯表明单峰重排是立体特异性的,并分别导致形成8- exo和8-内-苯基双环辛烯。讨论了二-π-甲烷结构与三重态反应效率之间的关系,以及构象对重排立体化学的影响。