lesser crowding of the di-isopropylphosphino-substituted catalysts. Experimentally determined kinetic isotope effects in conjunction with DFT-based analysis support a dehydrogenation mechanism involving initial pre-equilibrium oxidative addition of the amine α-C-H bond followed by rate-determining elimination of the β-C-H bond.
发现
二异丙基膦基取代的夹钳连接的
铱催化剂对于简单叔胺的脱氢以产生烯胺比先前报道的二
叔丁基膦基取代的物种明显更有效。还发现,
二异丙基膦基取代的配合物催化几种β-官能化叔胺的脱氢反应,得到相应的1,2-二官能化烯烃。二
叔丁基膦基取代的物质对这种底物无效;据推测,明显的差异归因于
二异丙基膦基取代的催化剂较少的拥挤。