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Issue 22, 2004
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Transition metal complexes of the chelating phosphine boraneligand Ph2PCH2Ph2P·BH3

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Abstract

Chromium and ruthenium complexes of the chelating phosphine borane H3B·dppm are reported. Addition of H3B·dppm to [Cr(CO)4(nbd)] (nbd = norbornadiene) affords [Cr(CO)41-H3B·dppm)] in which the borane is linked to the metal through a single B–H–Cr interaction. Addition of H3B·dppm to [CpRu(PR3)(NCMe)2]+ (Cp = η5-C5H5) results in [CpRu(PR3)(η1-H3B·dppm)][PF6] (R = Me, OMe) which also show a single B–H–Ru interaction. Reaction with [CpRu(NCMe)3]+ only resulted in a mixture of products. In contrast, with [Cp*Ru(NCMe)3]+ (Cp* = η5-C5Me5) a single product is isolated in high yield: [Cp*Ru(η2-H3B·dppm)][PF6]. This complex shows two B–H–Ru interactions. Reaction with L = PMe3 or CO breaks one of these and the complexes [Cp*Ru(L)(η1-H3B·dppm)][PF6] are formed in good yield. With L = MeCN an equilibrium is established between [Cp*Ru(η2-H3B·dppm)][PF6] and the acetonitrile adduct. [Cp*Ru(η2-H3B·dppm)][PF6] can be considered as being “operationally unsaturated”, effectively acting as a source of 16-electron [Cp*Ru(η1-H3B·dppm)][PF6]. All the new compounds (apart from the CO and MeCN adducts) have been characterised by X-ray crystallography. The solid-state structure of H3B·dppm is also reported.

Graphical abstract: Transition metal complexes of the chelating phosphine borane ligand Ph2PCH2Ph2P·BH3

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Article information


Submitted
03 Sep 2004
Accepted
07 Oct 2004
First published
25 Oct 2004

Dalton Trans., 2004, 3883-3892
Article type
Paper

Transition metal complexes of the chelating phosphine borane ligand Ph2PCH2Ph2P·BH3

N. Merle, G. Koicok-Köhn, M. F. Mahon, C. G. Frost, G. D. Ruggerio, A. S. Weller and M. C. Willis, Dalton Trans., 2004, 3883
DOI: 10.1039/B413650K

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