过氧乙酸
催化作用
化学
单体
锰
三聚体
高分子化学
有机化学
药物化学
二聚体
过氧化氢
聚合物
作者
Andrew Murphy,T. Daniel P. Stack
出处
期刊:Journal of Molecular Catalysis A-chemical
[Elsevier]
日期:2006-05-01
卷期号:251 (1-2): 78-88
被引量:90
标识
DOI:10.1016/j.molcata.2006.01.042
摘要
Twenty-two MnII complexes were screened for the catalytic epoxidation of terminal olefins using peracetic acid as the oxidant. A limited number of these complexes are efficient catalysts using peracetic acid solutions generated with H2SO4 (PAAC), but most complexes are effective at 1 mol% catalyst loading using peracetic acid generated with strongly acidic resins (PAAR). Under the less acidic conditions of PAAR, [MnII(phen)2(CF3SO3)2] has the highest activity of the catalysts screened, and epoxides terminal olefins using as little as 0.02 mol% catalyst within 5 min. The dimeric species [MnIII,IV2(phen)4(O)2](ClO4)3 is also a viable epoxidation catalyst with PAAR, but the dimeric species is reduced by the residual H2O2 to monomeric MnII species under the reaction conditions. By comparison, a similar dimeric complex [MnIII,IV2(R,R-mcp)2(O)2](ClO4)3, is not reduced by H2O2 under the reaction conditions and is not catalytically active, supportive of the notion that the catalytically relevant species is monomeric.
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