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Catalytic olefin hydrogenation by platinum(II)/tin(II) systems supported on phosphinated polystyrenes: a solid-state phosphorus-31 NMR study

1987; Elsevier BV; Volume: 322; Issue: 3 Linguagem: Inglês

10.1016/s0022-328x(00)99367-7

1872-8561

H. C. Clark, Colin A. Fyfe, Patrick J. Hayes, Ian J. McMahon, Julian A. Davies, Roderick E. Wasylishen,

Organoboron and organosilicon chemistry

Abstract Polymer-supported platinum(II) phosphine complexes have been prepared by the reaction of phosphinated polystyrenes with [PtCl 2 (NCPh) 2 ] and by the direct terpolymerization of styrene, divinylbenzenes, and cis -[PtCl 2 L 2 ] (L = p -styryldiphenylphosphine). The polymer-supported complexes have been fully characterized by solid-state phosphorus-31 NMR spectroscopy employing cross-polarization, magic angle spinning, and high power proton decoupling techniques and by elemental analysis. Samples of these polymer-supported complexes containing 10, 15, and 30% cross-linking have been employed in the tin(II) chloride co-catalyzed hydrogenation of styrene, using either methylene chloride or acetone as the reaction medium. Following catalysis, the polymer-supported complexes were examined by soild-state phosphorus-31 NMR spectroscopy to determine structural changes. Comparison with spectroscopic data obtained for analogous homogeneous systems allow insight into the catalytic chemistry.