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The Lightest Element Phosphoranylidene: NHC-Supported Cyclic Borylidene-Phosphorane with Significant B=P Character
Alfredo Rosas-Sánchez1, Isabel Alvarado-Beltran1, Antoine Baceiredo1
1Université de Toulouse, UPS, CNRS, LHFA UMR 5069, 118 route de Narbonne, 31062, Toulouse, France.
Angewandte Chemie (International Ed. in English)
|April 4, 2017
Abstract:
A borylidene-phosphorane, the lightest phosphoranylidene, which is stabilized by an N-heterocyclic carbene ligand, was synthesized and fully characterized. Experimental electron density analysis and DFT calculations indicate an enhanced ylene character (rather than an ylide character) with an exceptionally strong B→P π-back bonding related to the less electronegative boron compared to phosphorus.