Support for key steps of the mechanism for the transition metal catalyzed hydroboration reaction is provided by the characterization and reactions of 1, a cis-(boryl)(aryl) complex of osmium(II). This compound readily eliminates o-tolylBcat to give the osmium(0) intermediate 2, which in the presence of HBcat reestablishes the osmium-boron bond by forming 3. R=o-tolyl, H2 cat=catechol=1,2-(HO)2 C6 H4
1,(II)的顺式(
硼基)(芳基)配合物1的表征和反应,为过渡
金属催化的
硼氢化反应机理的关键步骤提供了支持。该化合物可轻松消除o-tolylBcat生成the(0)中间体2,该中间体在HBcat存在下通过形成3来重新建立-
硼键。R = o-
甲苯基,H2 cat =
儿茶酚= 1,2-(HO )2 C6 H4。