# Rhodium(I) complexes of \alpha-keto-stabilised 1,2-bis(diphenylphosphino)alkane mono ylides

Saravanabharathi, D and Venkatakrishnan, TS and Nethaji, M and Krishnamurthy, SS (2003) Rhodium(I) complexes of \alpha-keto-stabilised 1,2-bis(diphenylphosphino)alkane mono ylides. In: Journal of Chemical Sciences, 115 (5-6). pp. 741-749.

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Rhodium(I) complexes of the hybrid ylide-phosphine ligands, $Ph_2P(CH_2)_nPPh_2(CHC(O)C_6H_5)$ (n = 1: dppm-yl, or 2: dppe-yl) have been synthesized from $[Rh(\mu-Cl)(COD)]_2$ (COD = 1,5-cyclooctadiene) and characterized by NMR spectroscopic and X-ray structural methods. The dppe-yl behaves as an ambidentate ligand; it functions as a monodentate P-donor ligand with a dangling ylidic carbon in the neutral chloro complex, [(COD)Rh(Cl)(dppe-yl)] (1), whereas replacement of the chloride by a non-coordinating counter anion results in the formation of the complexes, $[(COD)Rh(L-L')]^+$ (L-L' = dppe-yl (2) or dppm-yl (3)) respectively in which the ligands are bonded to the metal via the phosphorus and the ylidic carbon atoms. The 1,5- cyclooctadiene (COD), present in the Rh(I) precursor, remains intact in the products. The structures of 1, 2 and 3 have been confirmed by X-ray crystallography.