The 1,4 concerted addition of Me3SnH to the singlet excited penta-1,3-dienes yields cis- and trans- adducts according to a stereochemistry which is incompatible with an allylmethylene relaxed configuration and suggests a doubly state.
1,4 协同加成反应中,Me3SnH 与单重激发态的五-1,3-二烯生成顺式和反式加合物,其立体
化学特点与烯丙基亚甲基松弛构型不符,提示存在双重态结构。