Enhancement of interfacial catalysis in a biphasic system using catalyst-binding ligands

摘要: TO avoid the problem of separation products from catalyst in homogeneous catalysis1, two-phase systems have been developed which catalytic complex (usually a water-soluble organo-metallic complex) remains one (generally aqueous) phase while remain second, immiscible phase2. Catalysis relies on transfer organic substrates into aqueous phase; but limited solubility these water leads to reaction rates much lower than those for conventional homo-geneous catalysis. Here we show that catalysis at interface system can be enhanced by using 'promoter ligand' which, although soluble phase, will bind organometallic and thus increase its concentration close phase. We demonstrate this approach hydroformylation 1-octene rhodium-based catalyst. A rate enhancement factor 10–50 is observed when introduce promoter ligand PPh3