Comparative Study Of Epoxidation Of Olefins Catalyzed By Chlorine Substituent Metalloporphyrins

Epoxidation of olefins is a reaction that in the carbon-carbon double bond position introduce oxygen atom formed epoxy groups. Epoxy compounds are windly used as organic chemical raw materials and intermediates. In recent years, metalloporphyrins as olefin epoxidation catalyst is a hot research topic in the field of biomimetic oxidation. Epoxidation of olefins has extensively attacted attention by many reseachers, because of its reaction condition is mild, reaction speed and green chemistry. At present, Oxidants of olefins epoxidation are oxygen, H2O2, organic peroxides, NaClO, and so on. Because of molecular oxygen is cheap, low pollution to environment and easy to get. It is the best oxygen source, And using molecular oxygen as the oxygen source of olefins epoxidation has been conducting. H2O2, alkyl hydrogen peroxide is also a kind of green oxidant, and has been made considerable progress in recent years.This paper investigated detailedly metalloporphyrins epoxidation of different olefins catalyzed by the 5,10,15,20-tetrakis-(2,6-dichlorophenyl)porphyrin iron (manganese) Chloride by molecular oxygen and organic peroxide as the oxidant. And focused on Synthesis of the 5,10,15,20-tetrakis-(2,6-dichlorophenyl)porphyrin iron (manganese) Chloride and its metalloporphyrin catalytic olefin epoxidation performance and compared to commonly used, structurally similar chlorine tetraphenyl metalloporphyrin and free substituted tetraphenyl metalloporphyrins. Analyzed the infection and reasons of metalloporphyrins substituted at different positions catalytic olefin epoxidation. discussed effection the different structure of peroxide on the catalytic oxidation reaction. The results show that by improving the Lindsey method, you can get a higher yield. Whether by air or by peroxide as the oxidant, the 5,10,15,20-tetrakis-(2,6-dichlorophenyl)porphyrin iron (manganese) chloride have excellent catalytic properties on the epoxidation of olefins, olefin conversion and epoxide selectivity is better than the tetra-(p-chorophenyl)-porphinato iron (manganese) Chloride, and reaction conditions is mild. This shows that the 5,10,15,20-tetrakis (2,6-dichlorophenyl)porphyrin iron (manganese) chloride is a good kind of industrial value of the green catalyst for olefin epoxidation, and it is worth further research.