Department of Chemistry, The University of Western Ontario, 1151 Richmond St. London, Ontario, N6A 5B7 Canada.
Chemistry. 2010 Nov 2;16(41):12454-61. doi: 10.1002/chem.201001447.
The synthesis and comprehensive characterization of the first dicationic tellurium analogues of N-heterocyclic carbenes (NHCs) has been reported, in both the +2 and +4 oxidation states. For the +2 oxidation state, a base-stabilized form of TeCl(2) is used as the starting material. The dications are isolated by means of halide metathesis and the solid-state structures confirm the previously calculated diimine bonding arrangement. For Te(IV), a diamine is used in a high-yielding dehydrohalogen coupling reaction from TeCl(4). The dicationic NHC analogue is isolated in a base-stabilized form through halide abstraction and subsequent coordination by pyridine.
已经报道了首例 N-杂环卡宾（NHC）的二价阳离子碲类似物的合成和综合表征，其中包括+2 和+4 氧化态。对于+2 氧化态，使用 TeCl(2)的碱稳定形式作为起始材料。通过卤素交换反应分离出二阳离子，并且固体结构证实了之前计算的二亚胺键合排列。对于 Te(IV)，在高收率的脱卤偶联反应中使用二胺从 TeCl(4)中获得。通过卤化物的提取以及随后由吡啶配位，以碱稳定的形式分离出二阳离子 NHC 类似物。
