Bowl-shaped phosphine (BSP) ligands markedly accelerated the rhodium-catalyzedhydrosilylation of ketones and ketimines as compared with the effect of conventional phosphine ligands such as PPh3 and P(t-Bu)3. 31P NMR study of a mixture of [RhCl(C2H4)2]2 and phosphines at various P/Rh ratios revealed that coordination of BSP to the rhodium metal was successfully regulated, and the resultant rhodium
与传统的膦配体(例如PPh 3和P(t- Bu)3)相比,碗形膦(BSP)配体显着促进了铑催化的酮和酮亚胺的氢化硅烷化。[RhCl(C 2 H 4)2 ] 2的混合物的31 P NMR研究磷和各种P / Rh比的膦表明,BSP与铑金属的配位作用得到了成功调节,并且仅带有一种膦配体(单(膦)铑)的铑配合物就起到了促进作用。使用HF / 6-31G(d)-CONFLEX / MM3优化的结构进行了BSP与常规膦的结构比较。分离具有1,5-环辛二烯作为配体的单(膦)铑配合物,并测定其X射线分子结构。
Rate Enhancement with a Bowl-Shaped Phosphane in the Rhodium-Catalyzed Hydrosilylation of Ketones