The role of central bond torsional motions in the direct cis⇌trans-photoisomerization of conjugated dienes
作者:William J. Leigh、J. Alberto Postigo
DOI:10.1039/c39930001836
日期:——
The photochemistry of the E,E- and E,Z-geometric isomers of 1,2-bis(ethylidene)-cyclopentane and -cyclobutane, and 2,3-bis(ethylidene)norbornane has been studied in hydrocarbon solution at room temperature; the results are inconsistent with the classical theoretical models for diene cisâtrans photoisomerization and ring closure, which assume that both processes involve only simple torsional motions about (one or both of) the termini of buta-1,3-diene.
在室温下的碳氢化合物溶液中,研究了 1,2-双(亚乙基)环戊烷和环丁烷以及 2,3-双(亚乙基)降冰片烷的 E,E- 和 E,Z- 几何异构体的光化学过程;研究结果与二烯顺反光异构化和闭环的经典理论模型不一致,后者假定这两个过程都只涉及丁-1,3-二烯端部(一个或两个)的简单扭转运动。