triethyl-, tripropyl-, tributyl-, and triphenyltin hydrides has been studied. The hydrostannation reactions, in all the cases studied, provided adducts with the organotin moiety at the β-carbon position; there was no indication of adducts with the organotin moiety at the α-carbon position. The reaction rate of tributyltin hydride with VTDB was accelerated by azobis(isobutyronitrile) (AIBN), retarded by
已经研究了2-
乙烯基-4,4,6-三甲基-1,3,2-二氧杂
硼烷(VTDB)与三甲基,三乙基,三丙基,三丁基和三苯基
锡氢化物的氢化
锡烷基化。在所研究的所有情况下,氢化
锡烷反应都提供了加合物,其中加合物的
有机锡部分位于β-碳位置;没有迹象表明
有机锡部分位于α-碳位置的加合物。氢化三丁
锡与VTDB的反应速率通过偶氮二(
异丁腈)(AIBN)加快,受加尔维氧基自由基阻滞,且不受溶剂极性变化的影响。这些观察结果证实了三
有机锡氢化物对VTDB进行氢化的自由基过程。