Insoluble ligands and their applications. II. Polysiloxane-phosphine ligands, their complexes, and hydrogenation catalysts

Article abstract of DOI:10.1016/0022-328X(81)80003-4

Solid polysiloxane ligands containing phosphine groups have been prepared by the hydrolytic condensation of (EtO)3Si(CH2)_nPPh2 (n=2,3) with Si(OEt)4.They have been characterised by solid-state NMR spectroscopy and by reaction with cobalt(II) and nickel(II).Both metals formed complexes of the type MCl2n-S>2 (where S is the polysiloxane matrix), but it was not usually possible to complex all the phosphine groups.The ligands were also treated with 2 (cod=cyclo-octa-1,5-diene), which gave reproducible complexes having significant activity as hydrogenation catalysts.The system appears to be analogous to the homogeneous complex