Dual Regioselectivity in the Photoallylation of Electron-Deficient Alkenes by Allylic Silanes
作者:Kazuhiko Mizuno、Munehiro Ikeda、Yoshio Otsuji
DOI:10.1246/cl.1988.1507
日期:1988.9.5
The photoreaction of 1-aryl-2,2-dicyanoethenes with allylic silanes in the presence of phenanthrene gave 4-aryl-5,5-dicyano-1-pentenes in high yields. In this photoreaction, the allylic groups were introduced regioselectively at the β-position to cyano group. In contrast, the photoreaction of alkylidenepropanedinitriles with allylic silanes gave products allylated at the α-position to cyano group along with their reduction products.
Cope; Hofmann; Hardy, Journal of the American Chemical Society, 1941, vol. 63, p. 1855
作者:Cope、Hofmann、Hardy
DOI:——
日期:——
Photoallylation and Photoreduction of Cyclohexylidenepropanedinitrile by Use of Allyltrimethylsilane via Photoinduced Electron Transfer: Control of the Product Ratio Depending on p<i>K</i><sub>a</sub> Values of Additives
[GRAPHICS]Irradiation of an acetonitrile solution containing cyclohexylidenepropanedinitrile (1) and allyltrimethylsilane (2) in the presence of phenanthrene afforded two kinds of allylated products (3, 4) and a reduction product (5). The product ratio of 3, 4, and 5 dramatically changed depending on the pK(a) values of additives.