A biomimetic system of cytochrome P450, constituted by [5-(4-(I-methylpyridinium))-10,15,20-triphenylporphyrinato] manganese(III) dichloride (Mn1) included in cetylpyridinium chloride (CPyCl) micellar phase, features good catalytic activity in the NaClO promoted epoxidation of styrene. A closely related system, i.e. [5-(4-(3-trimethylammonium) propyloxyphenyl)-10,15,20-tryphenyl-porphyrinato] manganese(ID) dichloride (Mn2) in cetyltrimethylammonium bromide (CTAB), presents a lower reactivity, similar to that achieved in ethanol-water solvent mixture. A crossover experiment, i.e. that carried out with Mn1/CTAB system, shows intermediate degree of conversion. These findings indicate that the catalytic properties of the investigated systems are deeply influenced by the specific non-covalent interactions established among the catalyst, substrate, and surfactant. (C) 2002 Elsevier Science B.V. All rights reserved.
Structural effects on the NaOCl epoxidation of styrene in micellar media catalysed by amphiphilised Mn(III)metalloporphyrins / Monti, D; Pastorini, A; Mancini, G; Borocci, S; Tagliatesta, P. - In: JOURNAL OF MOLECULAR CATALYSIS. A: CHEMICAL. - ISSN 1381-1169. - 179:1-2(2002), pp. 125-131. [10.1016/S1381-1169(01)00406-X]
Structural effects on the NaOCl epoxidation of styrene in micellar media catalysed by amphiphilised Mn(III)metalloporphyrins
Monti D;
2002
Abstract
A biomimetic system of cytochrome P450, constituted by [5-(4-(I-methylpyridinium))-10,15,20-triphenylporphyrinato] manganese(III) dichloride (Mn1) included in cetylpyridinium chloride (CPyCl) micellar phase, features good catalytic activity in the NaClO promoted epoxidation of styrene. A closely related system, i.e. [5-(4-(3-trimethylammonium) propyloxyphenyl)-10,15,20-tryphenyl-porphyrinato] manganese(ID) dichloride (Mn2) in cetyltrimethylammonium bromide (CTAB), presents a lower reactivity, similar to that achieved in ethanol-water solvent mixture. A crossover experiment, i.e. that carried out with Mn1/CTAB system, shows intermediate degree of conversion. These findings indicate that the catalytic properties of the investigated systems are deeply influenced by the specific non-covalent interactions established among the catalyst, substrate, and surfactant. (C) 2002 Elsevier Science B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
