Oxidation of sulfides in aqueous media catalyzed by pyrazole-oxidoperoxido-molybdenum(VI) complexes
authors Bruno, SM; Amarante, TR; Paz, FAA; Pillinger, M; Valente, AA; Goncalves, IS
nationality International
journal INORGANICA CHIMICA ACTA
author keywords Molybdenum; Peroxido complexes; Pyrazole; Hydrogen peroxide; Sulfoxidation; Water
keywords MOLYBDENUM(VI) COMPLEXES; MOLECULAR-STRUCTURE; METAL DERIVATIVES; OXYGEN-TRANSFER; SULFOXIDES; CHEMISTRY; PYRAZOLE; CRYSTAL; POLY(PYRAZOLYL)ALKANES; COORDINATION
abstract The complex [MoO(O-2)(2)(pyrazole)(2)] (1) is an effective catalyst for the oxidation of organic sulfides (methyl-phenylsulfide and diphenylsulfide). Reactions can be run in water as the only medium, at low temperature (25 degrees C), with low catalyst loadings (0.2 mol%) and excellent H2O2 efficiency with no significant non-productive decomposition of the oxidant. Under conditions that favor sulfone formation, the overall process, including isolation of the precipitated product (by filtration or centrifugation) and recycling of the aqueous phase con-taining the catalyst, can be performed in the absence of organic or ionic liquid solvents. Catalytic results with the recycled aqueous phase were the same as those obtained in the first cycle. With water as the sole solvent, 1 is a superior catalyst to the 3,5-dimethylpyrazole complexes [MoO(O-2)(2)(dmpz)(2)] (2) and [Hdmpz](4)[Mo8O25.8(O-2)(0.2)(dmpz)(2)]center dot 4H(2)O (3). Crystal structures for 1 and 3 are presented.
publisher ELSEVIER SCIENCE SA
issn 0020-1693
year published 2020
volume 511
digital object identifier (doi) 10.1016/j.ica.2020.119814
web of science category Chemistry, Inorganic & Nuclear
subject category Chemistry
unique article identifier WOS:000552643400003
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