Spectroscopic and Structural Characterization of the CyNHC Adduct of B<sub>2</sub>pin<sub>2</sub> in Solution and in the Solid State
作者:Christian Kleeberg、Andrew G. Crawford、Andrei S. Batsanov、Paul Hodgkinson、David C. Apperley、Man Sing Cheung、Zhenyang Lin、Todd B. Marder
DOI:10.1021/jo202127c
日期:2012.1.6
The Lewis base adduct of B2pin2 and the NHC (1,3-bis(cyclohexyl)imidazol-2-ylidene), which was proposed to act as a source of nucleophilic boryl groups in the β-borylation of α,β-unsaturated ketones, has been isolated, and its solid state structure and solution behavior was studied. In solution, the binding is weak, and NMR spectroscopy reveals a rapid exchange of the NHC between the two boron centers
B 2销2的Lewis碱加合物和NHC(1,3-双(环己基)咪唑-2-基)被提议在α,β-已分离出不饱和酮,并对其固态结构和溶液行为进行了研究。在溶液中,结合很弱,NMR光谱显示两个硼中心之间NHC的快速交换。DFT计算表明,交换涉及NHC的解离和再结合,而不是分子内过程。