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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Migratory insertion in N-heterocyclic carbene-containing Fe carbonyl complexes: an experimental and theoretical study
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Migratory insertion in N-heterocyclic carbene-containing Fe carbonyl complexes: an experimental and theoretical study

机译:在含N-杂环卡宾的Fe羰基配合物中的迁移插入:实验和理论研究

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摘要

The compound [Fe(eta-C5H5)(CO)(2)( Me)] reacts thermally with N-heterocyclic carbenes (L) to give both alkyl, [Fe(eta-C5H5)(L)(CO)(Me)], and acyl, [Fe(eta-C5H5)(L)(CO)(COMe)], derivatives. The reaction temperature has been shown to affect the product distribution. The alkyl and acyl derivatives exist in an equilibrium that is more easily perturbed than in the tertiary phosphine analogues. DFT studies on the reactivity of [Fe(eta-C5H5)(CO)(2)( Me)] with PH3 and dihydroimidazole-2-ylidene (IH) have shown that CO exchange is energetically favoured for IH, and energetically disfavoured for PH3. The products of CO-induced migratory insertion, [Fe(eta-C5H5)(L)(CO)(COMe)], are more stable than the parent alkyl, [Fe(eta-C5H5)(L)(CO)(Me)], compounds. This stabilisation is larger when L = IH than when L = PH3. Stabilisation of the transition state by agostic interactions was seen in both instances, but this was significantly more pronounced for L = IH.
机译:化合物[Fe(eta-C5H5)(CO)(2)(Me)]与N-杂环卡宾(L)热反应,生成两个烷基,[Fe(eta-C5H5)(L)(CO)(Me) ]和酰基[Fe(eta-C5H5)(L)(CO)(COMe)]衍生物。已经表明反应温度影响产物分布。烷基和酰基衍生物以平衡存在,该平衡比叔膦类似物更容易受到干扰。 DFT研究[Fe(eta-C5H5)(CO)(2)(Me)]与PH3和二氢咪唑-2-亚烷基(IH)的反应性表明,CO交换对IH有利,而对PH3不利。 。 CO诱导的迁移插入的产物[Fe(eta-C5H5)(L)(CO)(COMe)]比母体烷基[Fe(eta-C5H5)(L)(CO)(Me)更稳定)],化合物。当L = IH时,该稳定度要大于当L = PH3时的稳定度。在两种情况下,都可以通过摩擦相互作用稳定过渡态,但对于L = IH则更为明显。

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