Carbenes more than measure up: Singlet stable carbenes compete with transition metals in the activation of enthalpically strong bonds, as shown by the cleavage of the EH bonds of silanes, boranes, and phosphanes (see scheme). However, in contrast with the electrophilic mode of activation observed with metals, carbenes act as nucleophiles towards these substrates. Dipp=2,6‐diisopropylphenyl.
卡宾超过测量高达:单峰稳定卡宾与过渡
金属在焓强键的激活竞争,如由E的裂解
硅烷,
硼烷的H键,和
磷烷(参见方案)。但是,与
金属观察到的亲电激活方式相反,碳烯对这些底物起亲核作用。浸渍= 2,6-二异丙基苯基。