Structural Characterization of the Solvate Complexes of the Lithium Salts of Diorganophosphides and Phosphinideneborates; A Pathway to Phosphorus-Boron Double Bonds
- 1 March 1987
- journal article
- research article
- Published by Taylor & Francis in Phosphorus and Sulfur and the Related Elements
- Vol. 30 (1-2) , 245-248
- https://doi.org/10.1080/03086648708080568
Abstract
The structures of several solvated lithium diorganophosphides are described. These may take a variety of structures including chain-like polymers with alternating Li+ and PR2 − groups, dimeric species with PR2 − groups bridging two Li+ ions or mononuclear species having terminal −PR2 groups which have pyramidal geometries at phosphorus. The Li+ ions in all structures are solvated by either THF or Et2O bases. Separation of the Li+ can be effected using 12-crown-4 to coordinate Li+ as [Li(12-crown-4)2]+ affording free [PR2]− counterions. An extension of these techniques has led to the synthesis of the first compounds which have B-P double bonds. These are the compounds [Li(Et2O)2PRBMes2] and [Li(12-crown-4)2][PRBMes2](R=Ph, C6H11,Mes) which have B-P bond lengths of 1.82 – 1.83Å.Keywords
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