Epoxidation of styrene with hydrogen peroxide in the presence of polymer-supported quaternary ammonium salts and peroxo complexes of W(VI)

✍ Scribed by Krassimir Vassilev; Rayna Stamenova; Christo Tsvetanov

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 130 KB
• Volume: 46
• Category: Article
• ISSN: 1381-5148
• DOI: 10.1016/s1381-5148(00)00058-4

✦ Synopsis

Quaternary ammonium salts immobilized onto poly(2-N,N-dimethylaminoethyl) methacrylate and a mixed network of 1 poly(oxyethylene) and poly(4-vinylpyridine) were prepared. These salts were characterized by an elemental analysis, IR, H 13 and C NMR spectroscopy. The catalytic activity of the polymeric complexes was studied in the epoxidation of styrene as a model reaction. The system under study consisted of a water-immiscible solvent, aqueous hydrogen peroxide and Na WO / H PO . The catalytic activity of the polymeric ammonium salts depends on the kind of support employed, as well 2 4 3 4

as on the length of hydrocarbon radicals and the nature of the anion. An increase in the selectivity of the reaction as compared to a system with non-immobilized salts is observed.