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。