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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Synthesis and characterisation of an N-heterocyclic carbene with spatially-defined steric impact
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Synthesis and characterisation of an N-heterocyclic carbene with spatially-defined steric impact

机译:具有空间确定的空间影响的N杂环卡宾的合成与表征

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摘要

The synthesis and co-ordination chemistry of a new 'bulky yet flexible' N-heterocyclic carbene ("IPaul") is reported. This carbene has spatially-defined steric impact; steric maps show that two quadrants are very bulky while the other two are quite open. The electronic properties of this carbene are very similar to those of other 1,3-diarylimidazol-2-ylidenes. Copper, silver, iridium, and nickel complexes of the new ligand have been prepared. In solution, the ligand adopts two different conformations, while X-ray crystallographic analyses of the transition metal complexes suggest that the syn-conformer is preferred in the solid state due to intermolecular interactions. The copper(I) chloride complex of this new ligand has been shown to be highly-active in the hydrosilylation of carbonyl compounds, when compared to the analogous IPr, IMes, IPr* and IPr*(OMe) complexes.
机译:据报道,一种新的“大而灵活”的N-杂环卡宾(“ IPaul”)的合成和配位化学。卡宾具有空间确定的空间影响;立体图显示两个象限非常庞大,而其他两个象限则非常开放。该卡宾的电子性质与其他1,3-二芳基咪唑-2-亚烷基的电子性质非常相似。已经制备了新配体的铜,银,铱和镍络合物。在溶液中,配体采用两种不同的构象,而过渡金属配合物的X射线晶体学分析表明,由于分子间的相互作用,顺式构象异构体在固态时是优选的。与类似的IPr,IMes,IPr *和IPr *(OMe)配合物相比,该新配体的氯化铜(I)配合物在羰基化合物的氢化硅烷化中具有很高的活性。

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