Dioxidomolybdenum(VI) and -tungsten(VI) Complexes with Tripodal Amino Bisphenolate Ligands as Epoxidation and Oxo-transfer Catalysts
Hossain, M. K., Schachner, J. A., Haukka, M., Lehtonen, A., Mösch-Zanetti, N. C., & Nordlander, E. (2017). Dioxidomolybdenum(VI) and -tungsten(VI) Complexes with Tripodal Amino Bisphenolate Ligands as Epoxidation and Oxo-transfer Catalysts. Polyhedron, 134, 275–281. https://doi.org/10.1016/j.poly.2017.04.036
© 2017 Published by Elsevier Ltd. This is a final draft version of an article whose final and definitive form has been published by Elsevier. Published in this repository with the kind permission of the publisher.
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 °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.
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