Journal
POLYHEDRON
Volume 134, Issue -, Pages 275-281Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2017.04.036
Keywords
Molybdenum; Tungsten; Sulfoxidation; Epoxidation; Oxygen atom transfer
Categories
Funding
- COST Action [CM1003]
- European Commission
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The molybdenum(VI) and tungsten(VI) complexes [MO2(L)] (M = Mo (1), W (2), H2L = bis(2-hydroxy-3,5-di-tert-butybenzyl)morpholinylethylamine) were synthesized and the complexes were used to catalyze oxotransfer reactions, viz. sulfoxidation, epoxidation and benzoin oxidation. For comparison, the same reactions were catalyzed using the known complexes [MO2(L')] (M = Mo (3), W (4), H2L' = bis(2-hydroxy-3,5-di-tert-butybenzyl)ethanolamine) and [MO2(L)] (M = Mo (5), W (6), H2L bis(2-hydroxy-3,5-di-tert-butybenzyl)diethyleneglycolamine). The oxo atom transfer activity between DMSO and benzoin at 120 degrees C was identical for all studied catalysts. Reasonable catalytic activity was observed for sulfoxidation by the molybdenum complexes, but all tungsten complexes were found to be inactive. Similarly, the molybdenum complex 1 exhibited relatively good epoxidation activity, while the corresponding tungsten complex 2 catalyzed only the epoxidation of cis-cyclooctene with low activity. (C) 2017 Published by Elsevier Ltd.
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