The hydrosilylation of carbonyl derivatives has been explored by the activation of diphenylsilane in the presence of a catalytic amount of an N-heterocyclic carbene (NHC). Presumably, a hypervalent silicon intermediate featuring strong Lewis acid character allows dual activation of both the carbonyl moiety and the hydride at the silicon center. Reduction under mild conditions could be accomplished using this organocatalytic process. Some interesting selectivities have been encountered.
在存在少量N-杂环卡宾(NHC)的情况下,通过二苯基
硅烷的活化,对羰基衍
生物的氢
硅化反应进行了探索。据推测,一个具有强Lewis酸特性的高价
硅中间体允许对羰基部分和
硅中心的
氢化物进行双重活化。利用这种有机催化过程,可以在温和条件下实现还原。已经遇到了一些有趣的选择性。