Lacunary Keggin polyoxotungstate as reaction-controlled phase-transfer catalyst for catalytic epoxidation of olefins

✍ Scribed by Ming-Qiang Li; Xi-Gao Jian; Yong-Qiang Yang

• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 288 KB
• Volume: 22
• Category: Article
• ISSN: 0256-7660
• DOI: 10.1002/cjoc.20040220823

✦ Synopsis

Abstract

A new reaction‐controlled phase‐transfer catalyst system, lacunary Keggin polyoxotungstate [C~7~H~7~N(CH~3~)~3~]~9~PW~9~O~34~ has been synthesized and used for catalytic epoxidation of olefins with H~2~O~2~ as the oxidant. Infrared spectra were used to analyze the behavior of the phase transfer of catalyst. In this system, the catalyst not only can act as homogeneous catalyst but also as heterogeneous catalyst to be easily filtered and reused. The epoxidation reaction is clean and exhibits high conversion and selectivity as well as excellent catalyst stability.