TAILIEUCHUNG - Biomimetic Based Applications Part 2

Tham khảo tài liệu 'biomimetic based applications part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 2 Biomimetic Oxidation of Hydrocarbons with Air over Metalloporphyrins Guofang Jiang Qiang Liu and Cancheng Guo School of Chemistry and Chemical Engineering Hunan University Changsha 410082 Hunan p. R. China 1. Introduction The oxidation of C-H C-C and c c of hydrocarbons from the syntheses of many fine chemicals to the manufacture of various commodities in large scale plays great important role in transformation of basic materials to useful synthetic building in organic chemistry and in conversion of hydrocarbon to oxy gen-containing industrial production especially the hydroxylation epoxidation degradation of hydrocarbon derivatives 1-6 . Conventional oxidation methodologies often suffer low chemo- and or regio-selectivity with low conversion and low turnover number TON in an unfriendly way from both economical and environmental aspects which the catalyst is very expensive and generates amounts of hazardous waste. Oxidation reactions catalyzed by both non-metal 7-8 and metal 9-14 catalysts have been receiving increasing attention particularly for the highly selective aerobic oxidations catalyzed by metal complexes 15-17 . In nature aerobic oxidation processes are carried out in a highly selective manner by mono- or dioxygenases under mild conditions 18-19 . A well-known type of monooxygenase is cytochrome P-450 CP-450 20-23 which features an iron porphyrin core and can catalyze a wide variety of oxidation reactions including epoxidation hydroxylation dealkylation degradation dehydrogenation and oxidation of amines sulfides alcohols and aldehydes even for unreactive substrates such as unactivated hydrocarbons. This stimulates numerous efforts in developing biomimetic oxidation systems 24-26 . Metalloporphyrins with a core structure closely resembling that of the iron porphyrin core of CP-450 have been extensively studied as catalysts to oxidate a series kind of reactions mimic the natural style 24 27 . In 1979 Groves and co-workers 28 reported the first oxidation

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