Unsupported boron–carbon σ-coordination to platinum as an isolable snapshot of σ-bond activation

Holger Braunschweig (), Peter Brenner, Rian D. Dewhurst, Ivo Krummenacher, Bernd Pfaffinger and Alfredo Vargas
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Holger Braunschweig: Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland
Peter Brenner: Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland
Rian D. Dewhurst: Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland
Ivo Krummenacher: Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland
Bernd Pfaffinger: Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland
Alfredo Vargas: Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland

Nature Communications, 2012, vol. 3, issue 1, 1-6

Abstract: Abstract σ-Complexes of transition metals—key intermediates in metal-mediated bond activation and homogeneous catalysis—have traditionally been isolable only when chelating or when one of the participating atoms is hydrogen. Here, by treating the Lewis-basic transition metal complex [Pt(PEt3)4] with an electron-poor borirene, we isolate a complex with an unsupported borirene ligand bound, not through the unsaturated C=C bond, but exclusively via a B–C single bond. Using NMR spectroscopy, X-ray crystallography and density functional theory calculations, we show, herein, that coordination of the borirene ligand is based on electron donation from the B–C σ bond to the metal, aided by a strong Pt-to-B dative interaction. The complex is the first isolable non-agostic σ-complex featuring two p-block elements and has broad implications as a model for the metal-mediated activation of strong p-block-p-block σ-bonds.

Date: 2012
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DOI: 10.1038/ncomms1884

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