Metalloporphyrins and crown ether groups were simultaneously supported on chloromethylated polystyrene resin to produce a series of polymer-supported catalysts. The synthesis of these catalysts has been studied. The i...Metalloporphyrins and crown ether groups were simultaneously supported on chloromethylated polystyrene resin to produce a series of polymer-supported catalysts. The synthesis of these catalysts has been studied. The influence of pH, concentrations of NaOCl and phase transfer catalysts on the epoxidation of styrene catalyzed by these catalysts has also been investigated. The experimental results show that manganese(Ⅲ) porphyrin bound to chloromethylated polystyrene which bears crown ether groups is effective catalysts for the epoxidation of styrene by sodium hypochlorite. The introduction of crown ether groups increases the catalytic efficiency of supported metalloporphyrins. The kinetics of epoxidation catalyzed by supported manganese(Ⅲ) porphyrins obeys Michaelis-Menten equation-the characteristic of enzyme-driven reaction.展开更多
Six quinine-porphyrin Mn? complexes was synthesized by a certain of new chiral quinine-porphyrin.Their catalytic properties for the epoxidation of olefins in two-phase system (CH 2Cl 2/H 2O) were studies.The result in...Six quinine-porphyrin Mn? complexes was synthesized by a certain of new chiral quinine-porphyrin.Their catalytic properties for the epoxidation of olefins in two-phase system (CH 2Cl 2/H 2O) were studies.The result indicated these not only can enhance catalyzing activity,but also showed obvious phase-transfer function.That the reaction condition had affacfed the results of epoxidation.展开更多
文摘Metalloporphyrins and crown ether groups were simultaneously supported on chloromethylated polystyrene resin to produce a series of polymer-supported catalysts. The synthesis of these catalysts has been studied. The influence of pH, concentrations of NaOCl and phase transfer catalysts on the epoxidation of styrene catalyzed by these catalysts has also been investigated. The experimental results show that manganese(Ⅲ) porphyrin bound to chloromethylated polystyrene which bears crown ether groups is effective catalysts for the epoxidation of styrene by sodium hypochlorite. The introduction of crown ether groups increases the catalytic efficiency of supported metalloporphyrins. The kinetics of epoxidation catalyzed by supported manganese(Ⅲ) porphyrins obeys Michaelis-Menten equation-the characteristic of enzyme-driven reaction.
文摘Six quinine-porphyrin Mn? complexes was synthesized by a certain of new chiral quinine-porphyrin.Their catalytic properties for the epoxidation of olefins in two-phase system (CH 2Cl 2/H 2O) were studies.The result indicated these not only can enhance catalyzing activity,but also showed obvious phase-transfer function.That the reaction condition had affacfed the results of epoxidation.