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首页> 外文期刊>Organometallics >A Transient Vanadium(III) Neopentylidene Complex. Redox Chemistry and Reactivity of the V=(CHBu)-Bu-t Functionality
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A Transient Vanadium(III) Neopentylidene Complex. Redox Chemistry and Reactivity of the V=(CHBu)-Bu-t Functionality

机译:瞬态钒(III)新戊叉基配合物。 V =(CHBu)-Bu-t官能团的氧化还原化学和反应性

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摘要

The vanadium(III) bis(neopentyl) complex (PNP)V((CH2Bu)-Bu-t)(2) (PNP = N[4-Me-2-((PPr2)-Pr-i)C6H3](2)(-)), a complex readily prepared from alkylation of (PNP)VCl2 with 2 equiv of LiCH2'Bu, serves as a precursor to the transient vanadium(III) alkylidene complex "(PNP)V=(CHBu)-Bu-t". Two-electron oxidation of the intermediate [(PNP)V=CH'Bu] with chalcogen sources results in formation of the vanadium(V) chalcogenide series (PNP)V=(CHBu)-Bu-t(X) (X = O, S, Se, Te). This family of chalcogenide-alkylidenes has been studied via V-51 NMR spectroscopy in combination with DFr computational methods. The redox chemistry of [(PNP)V=CH'Bu] and the reactivity of the alkylidene ligand are explored with the substrates N3SiMe3, N -(CBu)-Bu-t, N-2, and azobenzene. It was discovered that N=N cleavage of the last substrate can be achieved without oxidation of the metal.
机译:钒(III)双(新戊基)络合物(PNP)V((CH2Bu)-Bu-t)(2)(PNP = N [4-Me-2-((PPr2)-Pr-1)C6H3](2 )(-)),是由(PNP)VCl2与2当量的LiCH2'Bu烷基化而制备的络合物,是瞬态钒(III)亚烷基络合物“(PNP)V =(CHBu)-Bu- t”。用硫属元素源对中间体[(PNP)V = CH'Bu]进行两电子氧化导致形成钒(V)硫族化物系列(PNP)V =(CHBu)-Bu-t(X)(X = O ,S,Se,Te)。该硫族化物-亚烷基家族已通过V-51 NMR光谱结合DFr计算方法进行了研究。用底物N3SiMe3,N-(CBu)-Bu-t,N-2和偶氮苯研究了[(PNP)V = CH'Bu]的氧化还原化学和亚烷基配体的反应性。已经发现,可以在不氧化金属的情况下实现最后衬底的N = N裂解。

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