of n-Bu3SnH across terminal and internal alkynes, including related α,β-unsaturated carboxyl compounds, is reported. The reaction is initiated by the trityl salt [Ph3C]+[B(C6F5)4]− and proceeds through β-tin-stabilized vinyl cations. Their reduction by hydride transfer from n-Bu3SnH explains the high Z-selectivity in the formation of the vinyl stannanes.
对于A无
金属方法抗的-addition Ñ -Bu 3报道,SNH跨越终端和内部
炔烃,包括相关的α,β不饱和羧基化合物。该反应由三苯甲基盐[Ph 3 C] + [B(C 6 F 5)4 ] -引发,并通过β-
锡稳定的
乙烯基阳离子进行。它们通过从n -Bu 3 SnH转移
氢化物而还原,这说明了
乙烯基锡烷的形成具有很高的Z-选择性。