Issue 11, 1999

Monomeric alkali metal complexes of a sterically demanding, donor-functionalised secondary phosphide ligand

Abstract

The novel sterically demanding, amino-functionalised secondary phosphine (2-Me2NCH2C6H4)RPH [R = CH(SiMe3)2] was synthesized by the reaction of RPCl2 with [Li{C6H4CH2NMe2-2}], followed by reduction with LiAlH4. The compound is readily metallated with BunLi to yield the lithium phosphide [Li{PR(C6H4CH2NMe2-2)}(THF)2] 1·2THF, in which the ligand binds to Li through both its N and P. Metathesis between 1 and NaOBut or KOBut yielded the sodium and potassium phosphides [M{PR(C6H4CH2NMe2-2)}] (M = Na 2 or K 3), respectively. Compound 2 crystallises as the monomeric adduct [Na{PR(C6H4CH2NMe2-2)}(tmen)], in which the formally four-co-ordinate Na exhibits a short contact with one of the ipso-carbons of the phosphide ligand. Compound 3 crystallises in the presence of pmdien as the mononuclear adduct [K{PR(C6H4CH2NMe2-2)}(pmdien)] in which the potassium centre is only five-co-ordinate, although again showing a short K  · · ·  Cipso contact. The compounds have been characterised by multinuclear NMR spectroscopy, and 1–3 by X-ray crystallography.

Supplementary files

Article information

Article type
Paper

J. Chem. Soc., Dalton Trans., 1999, 1825-1830

Monomeric alkali metal complexes of a sterically demanding, donor-functionalised secondary phosphide ligand

W. Clegg, S. Doherty, K. Izod, H. Kagerer, P. O’Shaughnessy and J. M. Sheffield, J. Chem. Soc., Dalton Trans., 1999, 1825 DOI: 10.1039/A900869A

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