Catalytic activity of a dinuclear manganese complex (MnMeTACN) on the oxidation of ethyl linoleate

Z.O. Oyman, W. Ming, R. Linde, van der

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Catalytic activity of a dinuclear manganese-based complex [Mn2IV(ì-O)3L2](PF6)2 (MnMeTACN) (L = 1,4,7-trimethyl-1,4,7-triazacyclononane), and its combination with a polyamine, 1,1,4,7,10,10-hexamethyltriethylenetetramine (HMTETA), was investigated on the oxidation of ethyl linoleate (EL). When MnMeTACN was molecularly mixed with EL in a co-solvent (methanol), MnMeTACN alone was found to be a very active catalyst for the oxidation of unpurifed EL (containing a small amount of hydroperoxides), similar to the catalytic activity of a Co-based catalyst. For purified EL (free of hydroperoxides), the addition of tert-butyl hydroperoxide was necessary to rapidly initiate the EL oxidation. A tentative catalytic cycle for MnMeTACN was proposed on the basis of electrospray ionization mass spectrometry (ESI-MS) investigation. The existence of HMTETA significantly accelerated the decomposition of the formed hydroperoxides into alkoxy free radicals, which in turn led to a high level of volatile aldehyde byproducts due to â-scission reactions.
Original languageEnglish
Pages (from-to)191-196
JournalApplied Catalysis. A, General
Issue number2
Publication statusPublished - 2007

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