长链烷氧基取代金属卟啉／H2O2体系催化烯烃环氧化反应研究

长链烷氧基取代金属卟啉／Ｈ_２Ｏ_２体系催化烯烃环氧化反应研究肖友发，游劲松，余孝其，虞小华，蓝仲薇（四川大学化学系成都６１００６４）关键词长链烷氧基金属卟啉，过氧化氢，烯烃，环氧化反应具有疏水结合部位的金属卟啉，如甾体一金属卟啉［１］、环糊精一金属卟...

EPOXIDATION OF STYRENE WITH HYDROGEN PEROXIDE CATALYZED BY LONG CHAIN ALKOXYL-SUBSTITUTED METALLOPORPHYRINS

Styrene can be epoxidized with 30% H_2O_2 under H_2O-CH_2Cl_2 two-phase conditions.Reactions are catalyzed by long chain alkoxyl-substituted metalloporphyrins(P) and are strongly accelerated by the addition of catalytic amounts of benzoic acid (A) and lipophilic imidazole (L):pH values are adjusted to the range of 4.5-5.0.The fastest reaction rates are found for L/P=12 and A/P=1.The long chain alkaxyl- substituted metalloporphyrins show higher catalytic activity than the simple metalloporphyrins. This is beause the hydrophobic microenvironment provided by the long chain alkoxyl plays an important role in the epoxidation of styrene.