A Thermomorphic Polymeric Catalyst for Alcoholic Oxidation
H. Hamamoto, Y. Suzuki, Y. M. A. Yamada, H. Tabata, H. Takahashi, S. Ikegami*
Teikyo University, Japan
21 September 2005 (online)
Aquacatalytic oxidation of secondary and primary alcohols using a thermomorphic PNIPAAm polymer-supported phosphotungstate under emulsive conditions is described. The oxidation of secondary alcohols was carried out with 1.5 equivalents of a 10% aqueous H2O2 solution in the presence of the catalyst (0.1-0.2 mol%) at 90 ºC to give the corresponding ketones in 88-93% yield (5 entries). The oxidation of primary alcohols gave the corresponding carboxylic acids in 84-89% yield (2 entries). The catalyst was recycled and reused three times.