Use of Phospha-Alkynes RC[dbnd]P in Organometallic Chemistry

Abstract
Novel reactions of phospha-alkynes are described. Phospha-alkynes, RC[dbnd]P, are proving to be important building blocks in inorganic and organometallic chemistry. A variety of ligating modes are exhibited by RC[dbnd]P towards transition metal centres but, interestingly, the preferred bonding interaction is with the P[dbnd]C triple bond, rather than via the phosphorus lone-pair electrons. Previously,1,2 we have shown that n1-phospha-alkyne complexes of Mo(0) and Fe(II) can be synthesised in certain compounds, in which linear molecules can approach the metal centre by virtue of the constraints imposed by the attendant diphosphane ligands.

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