Olefination and group transfer reactions of an electron deficient tantalum methylidene complex

Sarah M. Mullins; Robert G. Bergman; John Arnold

doi:10.1039/B512741F

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Dalton Transactions

Issue 1, 2006

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Olefination and group transfer reactions of an electron deficient tantalum methylidene complex

Sarah M. Mullins , Robert G. Bergman and John Arnold

Dalton Trans., 2006, 203-212

DOI: 10.1039/B512741F
Received 09 Sep 2005, Accepted 19 Oct 2005
First published on the web 14 Nov 2005

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Abstract
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The reactivity of an electronically unsaturated tantalum methylidene complex [TolC(NSiMe₃)₂]₂Ta(CH₂)CH₃ (1) supported by [TolC(NSiMe₃)₂] amidinate ligands is described. Electrophilic addition and olefination reactions of the Ta [double bond, length as m-dash] CH₂ functionality are reported. Alkylidene 1 participates in group-transfer reactions not observed in sterically similar, but electronically saturated, analogues. Reactions with substrates containing unsaturated C–X (X = C, N, O) bonds yield [Ta]X compounds and vinylated organic products; carbon–sulfur cleavage reactions to produce tantalum thioformaldehyde and tantalum sulfido complexes.

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Dalton Transactions

Olefination and group transfer reactions of an electron deficient tantalum methylidene complex

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