The nucleophilicity parameters (N) of 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene borane and 1,3-dimethylimidazol-2-ylidene borane are 9.55 and 11.88. This places N-heterocyclic carbene boranes (NHC-boranes) among the most nucleophilic classes of neutral hydride donors. Reductions of highly electron-poor C═N and C═C bonds provide hydrogenation products along with new, stable borylated products
1,3-双(2,6-二异丙基苯基)
咪唑-2-亚
硼烷和1,3-二甲基
咪唑-2-亚烷基
硼烷的亲核参数(N)为9.55和11.88。这使N-杂环卡宾
硼烷(NHC-
硼烷)成为最亲核的中性
氢化物供体类别。高度贫电子的C═N和C═C键的还原提供了氢化产物以及新的稳定的
硼化产物。结果表明,NHC-
硼烷作为中性有机还原剂具有相当大的尚未开发的潜力。