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首页> 外文期刊>Chemistry: A European journal >Dicationic tellurium analogues of the classic N-heterocyclic carbene
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Dicationic tellurium analogues of the classic N-heterocyclic carbene

机译：经典的N杂环卡宾的阳离子碲类似物

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摘要

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. Carbene analogues: Compounds based on an unsaturated diimine ligand bear two lone pairs of electrons about the central element and can be considered structural mimics of N-heterocyclic carbenes (NHCs; see figure). Heterocycles centered about a saturated diamine carry one stereochemically active lone pair of electrons on tellurium, and are therefore isovalent as well as isostructural to NHCs.
机译：已经报道了在+2和+4氧化态下N-杂环卡宾（NHCs）的首个药用碲类似物的合成和全面表征。对于+2氧化态，将TeCl_2的碱稳定形式用作起始原料。通过卤化物复分解分离指示，并且固态结构证实了先前计算的二亚胺键合布置。对于Te〜（IV），在TeCl_4的高产脱卤化氢偶合反应中使用了二胺。 NHC类似物通过卤化物提取和随后的吡啶配位以碱稳定形式分离。卡宾类似物：基于不饱和二亚胺配体的化合物在中心元素周围带有两个孤对电子，可以视为N-杂环卡宾（NHC）的结构模拟物。以饱和二胺为中心的杂环在碲上带有一个立体化学活性的孤对电子，因此与NHC呈等价结构。

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