1-acyl-2-cyclopentenes and 5-acylbicyclo[2.1.0]pentanes: photochemical and thermal isomerizations
作者:Kurt Schaffner
DOI:10.1016/s0040-4020(01)93785-8
日期:1976.1
direct irradiation the aldehyde eliminates carbon monoxide in the singlet excited state, and the aroyl compounds cleave to allyl-aroyl radical pairs both from the singlet and triplet states. In competition to α-cleavage the methyl ketones isomerize in an allylic 1,3-acetyl shift. The lowest-lying reactive triplet of these methyl ketones, characterized as a 3(π, π*) state in the case of the 3-phenyl homologue
1-酰基-2-环戊烯的光化学随酰基的性质而变化。在直接照射下,醛消除了单线态激发态的一氧化碳,并且芳酰基化合物从单线态和三线态裂解成烯丙基-芳酰基对。在竞争α-切割中,甲基酮以1,3-乙酰基的烯丙基移位异构化。这些甲基酮中最低的反应性三重态(在3-苯基同系物的情况下以3(π,π*)状态为特征)经过oxadi-π-甲烷重排,生成内-和外-5-的混合物乙酰基双环[2.1.0]戊烷。