Generation of Dicoordinate Boron(I) Units by Fragmentation of a Tetra-Boron(I) Molecular Square
作者:Merle Arrowsmith、Dominic Auerhammer、Rüdiger Bertermann、Holger Braunschweig、Gerhard Bringmann、Mehmet Ali Celik、Rian D. Dewhurst、Maik Finze、Matthias Grüne、Michael Hailmann、Thomas Hertle、Ivo Krummenacher
DOI:10.1002/anie.201608429
日期:2016.11.7
Reduction of carbene‐borane adduct [(cAAC)BBr2(CN)] (cAAC=1‐(2,6‐diisopropylphenyl)‐3,3,5,5‐tetramethylpyrrolidin‐2‐ylidene) cleanly yielded the tetra(cyanoborylene) species [(cAAC)B(CN)]4 presenting a 12‐membered (BCN)4 ring. The analysis of the Kohn–Sham molecular orbitals showed significant borylene character of the BI atoms. [(cAAC)B(CN)]4 was found to reduce two equivalents of AgCN per boron center
卡宾-硼烷加合物[(cAAC)BBr 2(CN)]的还原(cAAC = 1-(2,6-二异丙基苯基)-3,3,5,5-四甲基吡咯烷基-2-亚基)干净地产生四(氰基二甲苯基)物种[(cAAC)B(CN)] 4呈现一个12元(BCN)4环。对Kohn-Sham分子轨道的分析表明,B I原子具有明显的硼烯特征。发现[(cAAC)B(CN)3减少了每个硼中心的两当量AgCN,从而产生了[(cAAC)B(CN)3],然后在与IMeMe(1,3,4,5-四甲基咪唑-2-亚基)反应后破碎成两个坐标的硼(I)单元,得到相应的三坐标混合的cAAC-NHC氰基二甲苯。在过量膦存在下,通过还原[(cAAC)BBr 2(CN)]可制得类似的cAAC-膦氰基甲硼烷。