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DOI: 10.1039/A608205J (Paper) Reference Section for: J. Chem. Soc., Perkin Trans. 2, 1997, 1577-1584

Manganese-porphyrins and -azaporphyrins as catalysts in alkene epoxidations with peracetic acid. Part 2. Kinetics and mechanism[hair space]1

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Stefano Banfi, Marco Cavazzini, Fausta Coppa, Svetlana V. Barkanova and Oleg L. Kaliya

Abstract

cis-Stilbene (cSt) and 1,1-diphenyl-2-picrylhydrazine (DPPH) were used as substrates for kinetic investigations of the catalytic system based on MnIII-porphyrins and peracetic acid in CH3CN. Catalysts employed were tetra-(2,6-dichlorophenyl)-porphyrinatomanganese chloride (TDCPPMnCl) 5, octanitrophthalocyaninatomanganese chloride (NO2PcMnCl) 6 and tetra(tert-butyl)-tetraazaporphyrinatomanganese chloride (TAPMnCl) 7. It was found that for all these catalysts the first step of the reaction mechanism is the formation of an adduct ‘A' between the catalyst and AcOOH in a reversible way (k1/k-1), followed by an irreversible stage (k2) for the formation of MnV-oxo species. The oxidative capability of the adduct ‘A' was found to be dependent on the electronic structure of the catalyst, while the reactivity of Mn-oxo species is only slightly influenced by catalyst structure. The formation of the high-valent Mn-oxo species is the rate-determining step of alkene epoxidations as demonstrated by the same k2 value obtained with catalyst 6 in the epoxidation of cSt and trans-stilbene (tSt). Catalyst stability was found to be dependent on solvent polarity, CH3CN being the best reaction medium.

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