Reactions of ‘pincer’ pyridine dicarbene complexes of Fe(0) with silanes

Pugh, David, Wells, Neil J., Evans, David J. and Danopoulos, Andreas A. (2009) Reactions of ‘pincer’ pyridine dicarbene complexes of Fe(0) with silanes. Dalton Transactions, (35), 7189-7195. (doi:10.1039/b907141p).

Abstract

Reactions of Fe(C-N-C)(N2)2, 1a, or Fe(C-NMe-C)(N2)2, 1b, C-N-C = 2,6-bis(arylimidazol-2-ylidene)pyridine, C-NMe-C = 2,6-bis(arylimidazol-2-ylidene)-3,5-dimethylpyridine, aryl = 2,6-iPr2C6H3, with silanes are described. Complex 1a with excess SiPhH3 and complex 1b with excess Si(tol)H3, Ph = phenyl, C6H5, tol = 2-methylphenyl, gave the complexes [Fe(C-N-C)(SiH2Ph)2(?2-H-SiH2Ph)], 2a, and [Fe(C-NMe-C)(SiH2tol)2(?2-H-SiH2tol)], 2b, respectively. Complex 1b with excess SiPhH3 gave [Fe(C-NMe-C)(SiH2Ph)2(H)2], 3, which was formulated as a dihydride based on the relaxation time T1(min) in the 1H-NMR spectra. Reaction of 1a with SiPh2H2 gave complex [Fe(C-N-C)(SiHPh2)2(?2-H2)], 4, while reaction with Si(mes)H3 gave complex [Fe(C-N-C)(SiH2mes)2(N2)], 5, mes = mesityl, 2,4,6-trimethylphenyl. The comparison of the reactivity with other ‘pincer’ complexes of iron and the mechanism leading to 2a–5 are discussed.

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Contributors

Author: Neil J. Wells

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