Abstract
The structures and the hydroformylation catalytic activity of complexes of rhodium(I) with di- or triphosphines, or with tertiary phosphine anchorsites on polymers, have been studied. Substitution of one PPh 3 ligand of the parent complex, RhH(CO) 2(PPh 3) 2, by one phosphine group of a di- or triphosphine gives a bridged complex of higher catalytic activity than the parent complex, but substitution for all PPhs ligands gives a complex of lower activity. Immobilisation of Rh I at phosphine anchor-sites on polymeric supports gives square—planar or trigonal—bipyramidal complexes in which Rh I is coordinated to one or a maximum of two anchor-sites. The square—planar bis-(phosphine) complexes are normally trans. The structures adopted by these systems depend upon (a) the separation between anchor-sites, and (b) the flexibility of the side-chain containing the anchor-site. Polymeric supports containing the following anchor-sites have been investigated: ▪
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