Phase transfer catalysts polyethylene glycols immobilized onto metal oxide surfaces

✍ Scribed by Robert A. Sawicki

• Book ID: 104220812
• Publisher: Elsevier Science
• Year: 1982
• Tongue: French
• Weight: 204 KB
• Volume: 23
• Category: Article
• ISSN: 0040-4039
• DOI: 10.1016/s0040-4039(00)87313-x

✦ Synopsis

Catalysts prepared by reacting polyethylene glycol and polyethylcne glycol monomethyl ether with both alumina and silica gel were found to be effective phase transfer agents in displacement and oxidation reactions. The preparation of novel phase transfer catalysts and their application in solving synthetic problems are well documented. 1 Compounds such as quatcrnary ammonium and phosphonium salts, phosphoramides, crown ethers, and cryptands have been used to catalyze a variety of organic transformations including alkylation, oxidation, and displacement reactions. a Recent eEEorts have concentrated on the immobilization of these materials onto both organic polymers3 and metal oxides 4 to simplify, by filtration, the separation and recovery process. We describe herein the preparation OF a new catalyst system with phase transfer properties by reaction of a polyethylene glycol and monomethyl ether with alumina and silica gel.