Dioxidomolybdenum(VI) and -tungsten(VI) complexes with tripodal amino bisphenolate ligands as epoxidation and oxo-transfer catalysts

Summary, in English

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.

• Author: Kamal Hossain; Jörg A. Schachner; Matti Haukka; Ari Lehtonen; Nadia C. Mösch-Zanetti; Ebbe Nordlander
• Department/s: Chemical Physics
• Publishing year: 2017-09-25
• Language: English
• Pages: 275-281
• Publication/Series: Polyhedron
• Volume: 134
• Links: http://dx.doi.org/10.1016/j.poly.2017.04.036
• Document type: Journal article
• Publisher: Elsevier
• Topic: Materials Chemistry; Inorganic Chemistry
• Keywords: Epoxidation; Molybdenum; Oxygen atom transfer; Sulfoxidation; Tungsten
• Status: Published
• ISBN/ISSN/Other: ISSN: 0277-5387