Polystyrene arsonated, oxidation

SCHEME 163. Baeyer-Villiger oxidation of ketones using arsonated polystyrene and H2O2... 

Boron-containing catalysts have also found application, with a relatively lower stereoselectivity. Cyclohexene oxides can be obtained with a selectivity of 97.5% in the H2O2-AS2O3 system. Arsonated polystyrenes have also been employed as catalysts. Epoxidation of olefins may be attained with hydroperoxide bound on an aluminium oxide surface. ... 

Baeyer-Villiger oxidation of alkyl- and aryl-substituted C -C, cycloalkanones, steroid ketones and branched chain aliphatic ketones is catalysed by arsonated polystyrene resins [53], Larger size cycloalkanones and linear ketones react much slower. Water miscible and immiscible solvents can be used. With the latter, the resin behaves as an effective catalyst and a phase-transfer agent (triphase catalysis). The same compounds are also epoxidation catalysts. More recently, a method for the preparation of phenols by the oxidation of aromatic aldehydes and ketones has been reported. The most convenient catalysts are nitro-substituted arylseleninic acids and corresponding diselenides [54]. 

Table II. Oxidation of Ketones by 90% Hydrogen Peroxide Catalyzed by Arsonated Polystyrene (50% load) (30)...

Jacl979 Jacobson, S.E., Mares, F. and Zambri, P.M., Biphase and Triphase Catalysis. Arsonated Polystyrenes as Catalysts in the Baeyer-Villiger Oxidation of Ketones by aqueous Hydrogen Peroxide, J. Am. Chem. Soc., 101 (1979) 6938-6946. 

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