作者:Takuzo Funabiki、Yasuyuki Yamazaki、Yoshihiro Sato、Satohiro Yoshida
DOI:10.1039/p29830001915
日期:——
[Co(CN)3(bipy)H]–. The preliminary formation of a [π-acetylene–Co(CN)4]3– complex is assumed to explain the fact that the complex is active only at CN : Co < 5 : 1. Hydrocyanation is explained by the reductive coupling of the vinyl and cyano ligands of [σ-vinyl–Co(CN)5]3– which is formed by the reaction of the π-acetylene complex, rather than acetylene itself, with [Co(CN)5H]3–.
乙炔通过在CN:Co <5:1处制备的氰基钴酸盐进行区域选择性氢氰化,通过不饱和腈通过不使用氰化氢的方法生成饱和仲腈,然后将其部分氢化为烯烃或饱和烃。在2,2'-联吡啶存在下,乙炔的氢化作用占主导地位,反映出高活性氢化物络合物[Co(CN)3(bipy)H] –的形成。假定[π-乙炔-Co(CN)4 ] 3-配合物的初步形成是为了解释该配合物仅在CN:Co <5:1时才有活性。和[σ-乙烯基–Co(CN)5 ] 3–的氰基配体它是由π-乙炔络合物(而不是乙炔本身)与[Co(CN)5 H] 3–反应形成的。