Polymethacrylate and polystyrene-based resin-supported Pt catalysts in room temperature, solvent-less, oct-1-ene hydrosilylations using trichlorosilane and methyldichlorosilane

A first group of methacrylate-based resins have been prepared with different amine ligands each co-ordinating Pt(H). Evaluation of each of these as room temperature catalysts in the solvent-less hydrosilylation of oct-l-ene by trichlorosilane has identified a supported ethylene diamine derived ligand as providing the most active and stable Pt catalyst. A second group of methacrylate-based resins and third group of styrene-based resins have also been prepared with a variety of morphologies. Each of these has been chemically modified to introduce the same ethylene diamine derived ligand and subsequently Pt(ll) co-ordinated to each of these. Both groups of resin catalysts have been evaluated for activity, selectivity, Pt leaching and recyclability in the hydrosilylation of oct-l-ene by trichlorosilane and methyl-dichlorosilane. Specific samples of resin catalysts have been recycled up to I I times in successive batch reactions. The styrene-based resins have been shown to be more active than the methacrylate-based ones, almost certainly because as a group they are more hydrophobic. Get-type morphologies in the support are totally unsuitable and appear to provide severe mass transport limitations. The various macroporous resin based species are very attractive catalysts and the most likely optimum design criteria are discussed.