A novel substitution reaction by photoinduced electron-transfer between pyridine derivatives and alkyltin compounds
作者:Francesco Minisci、Francesca Fontana、Tullio Caronna、Lihua Zhao
DOI:10.1016/s0040-4039(00)79851-0
日期:1992.5
Photolysis of pyridine derivatives in the presence of SnBu4 or Sn2Bu6 leads to butyl derivatives in the α and γ positions. With 2,4-dicyanopyridine ipso-substitution of the cyano groups with the butyl groups exclusively occurs. With 4-cyanopyridine both ipso-substitution and substitution at the 2-position take place. A photo-induced electron-transfer mechanism is suggested.
在SnBu 4或Sn 2 Bu 6的存在下吡啶衍生物的光解作用会在α和γ位置产生丁基衍生物。在2,4-二氰基吡啶上,仅发生氰基与丁基的异丙基取代。用4-氰基吡啶在2位上都进行了ipso取代和取代。提出了光诱导的电子转移机理。