Abstract
The ditertiary-phosphine 1,2-bis(dicyclohexylphosphino)ethane (dcpe) has been shown to form the mononuclear, square-planar rhodium(I) and iridium(I) complexes [M(COD)(dcpe)]BPh 4 (COD = 1,5-cyclooctadiene), [M(dcpe) 2]BPh 4, and [MCl(CO)(dcpe)], which have been characterized by elemental analyses, infrared, and 1H and 31P{ 1H} NMR spectroscopy. Their behavior toward carbon monoxide in dichloromethane solution at different temperatures was examined, and the nature of the products formed established by IR and 31P{ 1H} NMR spectroscopy. Some of the products, including [M(CO) 2(dcpe)]BPh 4 and [Ir(COD)(CO)(dcpe)]BPh 4, were isolated in the solid state and fully characterized. The catalytic activity of the rhodium derivatives in the decarbonylation of benzaldehyde has been studied, and compared with that of the analogous complexes containing phenyl-substituted diphosphines.
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