Department of Chemistry and the Center for Computational Chemistry, The University of Georgia, Athens, Georgia 30602-2556, USA.
J Am Chem Soc. 2010 Oct 20;132(41):14370-2. doi: 10.1021/ja106631r.
The first anionic N-heterocyclic dicarbene, polymeric :C{N(2,6-Pr(i)(2)C(6)H(3))CHCLi(THF)} 1, containing both normal (C2) and abnormal carbene (C4) centers in the same five-membered imidazole ring (III), has been prepared by lithiation of the imidazole monocarbene, :C{N(2,6-Pr(i)(2)C(6)H(3))CH}(2). The dicarbene nature of 1 was unambiguously demonstrated by the formation of the group 13 Lewis acid adducts (THF)(2)Li:C{N(2,6-Pr(i)(2)C(6)H(3))CHC(LA)}, where LA = AlMe(3) [2·(THF)(2)] and BEt(3) [3·(THF)(2)].
第一个阴离子型 N-杂环二卡宾，聚合物:C{N(2,6-Pr(i)(2)C(6)H(3))CHCLi(THF)}1，在同一个五元咪唑环（III）中同时包含正常（C2）和异常卡宾（C4）中心，是通过咪唑单卡宾的锂化制备的，即：C{N(2,6-Pr(i)(2)C(6)H(3))CH}(2)。1 的二卡宾性质通过形成第 13 族路易斯酸加合物（THF）(2)Li：C{N(2,6-Pr(i)(2)C(6)H(3))CHC(LA)}得到了明确证明，其中 LA = AlMe(3)[2·(THF)(2)]和 BEt(3)[3·(THF)(2)]。
