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 SM ISO690:2012CHIHICHIN, Dmitry, COȚERUBA, Varvara, LEVCHENKO, Olga, GERBELEU, Nicolae, TIMKO, Grigore, GREBENCO, Svetlana, KAMALOV, Gerbert. Oxidation of dibenzyl ether by hydrogen peroxide at the presence of cobalt containing homo- and heteronuclear pivalates. In: Physical Methods in Coordination and Supramolecular Chemistry, 27 septembrie - 1 octombrie 2006, Chişinău. Chisinau, Republic of Moldova: 2006, XVII, p. 105. ISBN 978-9975-62-066-6. |
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| Physical Methods in Coordination and Supramolecular Chemistry XVII, 2006 |
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Conferința "The XV-th International Conference Physical Methods in Coordination and Supramolecular Chemistry : The XVII-th Reading in memory of Acad. A.Ablov" Chişinău, Moldova, 27 septembrie - 1 octombrie 2006 | ||||||
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It was revealed that under the oxidation of dibenzyl ether (DBE) by hydrogen peroxide in the presence of pivalates Сo(Piv)2 ( I), [Co(Piv)2]2 ( II), [Co3OPiv6(Py)3]2Piv2·7HPiv·2H2O (III), Co4Fe2O(Piv)10 (IV), CoCr2OPiv6·3Ppy (V), CoFe2OPiv6·3Ppy (VI) and [Cr3OPiv6]Piv·3Ppy (VII) the reaction products are hydroperoxide of DBE (HP), benzaldehyde (BAld) and benzoic acid (BAc).formulaThe complex (I) is characterized by high HP selectivity (58%), and carboxylates (III) and (IV) exhibit the noticeable selectivity by BAld, 48% and 42% respectively. A selectivity of BAc doesn’t depend on the composition and structure of studied complexes and amounts to 28% on average. It was found that the selectivity of HP and BAld formation depends practically linearly on the fractional conversion of hydrogen peroxide – the symbasis for BAld and slope opposition in case of HP. The selectivity of the process under discussion is compared with a catalytic activity of the complexes I–VII in Н2О2 decomposition and DBE oxidation by air. The assumption is stated that the most part of HP is formed by DBE interaction with hydrogen peroxide, and BAc – by BAld oxidation by oxygen formed at Н2О2 decomposition. On the basis of the kinetics data the eventual reasons of the studied metallocomplex catalysts observable distinctions are discussed. |
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