Photoisomerization of 3-benzoylacrylates on a silica gel surface: Effect of reaction environment on selectivity
作者:Tadashi Hasegawa、Yuko Yamazaki、Michikazu Yoshioka
DOI:10.1002/poc.610080107
日期:1995.1
On irradiation on a dry silica gel surface, 2-(N, N-dialkylamino)ethyl 3-benzoylacrylates undergo selective E-Z isomerization. Competing processes, such as remote-hydrogen abstraction via a charge-transfer state, with the photoisomerization in solution are completely suppressed on the surface. The yield of the Z - from the E- isomer increases with increase in the coverage of the E-isomer on the surface
在干燥的硅胶表面上照射时,3-苯甲酰基丙烯酸2-(N,N-二烷基氨基)乙基酯进行选择性的EZ异构化。溶液中的光致异构化等竞争过程(例如通过电荷转移状态进行的远距离氢提取)在表面上被完全抑制。来自E-异构体的Z-的产率随着表面上E-异构体的覆盖率的增加而增加,达到极限值。当氮原子上的烷基小时,Z-到E-异构体的热异构很容易在硅胶表面发生。没有任何氨基的丙烯酸苄基酯也经历选择性的光异构化。