Regioselective hydrosilylation of 1,3-dienes catalyzed by phosphine complexes of palladium and rhodium
作者:Iwao Ojima、Miyoko Kumagai
DOI:10.1016/s0022-328x(00)91720-0
日期:1978.9
The hydrosilylation of isoprene catalyzed by a palladium complex using chlorohydrosilanes proceeded via 1,4-addition to give Z-2-methylbuten-2-yl-silanes exclusively, the stereochemistry of which was determined on the basis of NMR spectroscopy observing the nuclear Overhauser effect (NOE). The result clearly demonstrates that the reaction is highly regioselective and stereo-selective. On the other
钯配合物使用氯代氢硅烷催化的异戊二烯的氢化硅烷化反应通过1,4-加成反应进行,仅得到Z -2-甲基丁烯-2-基硅烷,其立体化学是根据NMR光谱法观察到的核Overhauser效应确定的(NOE)。结果清楚地表明该反应是高度区域选择性和立体选择性的。另一方面,由铑配合物催化的反应得到主要产物3-甲基-丁烯-2-基硅烷,并伴有Z。-2-甲基丁烯-2-基硅烷,即反应的区域选择性与其他催化剂体系相反。在月桂烯和罗曼烯的氢化硅烷化中观察到相似的区域选择性,尽管明显的取代作用是明显的,尤其是在罗曼烯的情况下。提出了这些反应的可能机理。