Comparative study of the catalytic activity of a series of β-brominated Mn–porphyrins in the oxidation of olefins and organic sulfides: Better catalytic performance of the partially brominated ones

Autor:	Elaheh Bohloulbandi, Majid Jafarian, Saeed Zakavi, Saeed Rayati, Mehdi Rashvand avei
Rok vydání:	2012
Předmět:	Reaction conditions chemistry.chemical_classification Olefin fiber Sulfide Chemistry Phenyl sulfide Mn porphyrins Periodate Homogeneous catalysis Medicinal chemistry Catalysis Inorganic Chemistry chemistry.chemical_compound Materials Chemistry Organic chemistry Physical and Theoretical Chemistry
Zdroj:	Polyhedron. 34:102-107
ISSN:	0277-5387
Popis:	The oxidation of olefins and organic sulfides with tetra-n-butylammonium periodate (TBAP) in the presence of a Mn(III) complex from a series of partially and fully brominated meso-tetraphenylporphyrins, MnTPPBrx(OAc) (x = 0, 2, 4, 6 and 8) has been studied in a comparative manner. With the exception of MnTPPBr2(OAc), the half-wave potential for the Mn(III)/Mn(II) metal-centered process was gradually shifted to higher values on going from MnTPP(OAc) to MnTPPBr8(OAc). However, a complex order has been observed for the catalytic activity of the complexes; while the stability of the Mn–porphyrins towards oxidative degradation under the reaction conditions decreases in the order MnTPPBr8(OAc) > MnTPP(OAc) > MnTPPBr6(OAc) > MnTPPBr2(OAc) > MnTPPBr4(OAc), their catalytic activity has been found to follow the order MnTPPBr8(OAc) ≪ MnTPP(OAc) ⩽ MnTPPBr6(OAc) MnTPP(OAc) > MnTPPBr2(OAc) ⩾ MnTPPBr6(OAc) ≫ MnTPPBr8(OAc). The highest methyl phenyl sulfide conversion is 69% at room temperature.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e9d82b1b397afa7b1deafd03170cf988 https://doi.org/10.1016/j.poly.2011.12.021 Zobrazit plný text záznamu Full Text from ScienceDirect