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M. H. Habibi et al.
obtained in high to excellent yields under simple experimental conditions. The
catalyst can be reused with only low loss of activity.
Experimental
K5CoW12O40 Á 3H2O was prepared according to Refs. [30±33].
General procedure for the conversion of alcohols to their corresponding acetates
In a typical procedure, 108mg ꢀ1 mmol) benzyl alcohol and 153 mg ꢀ1.5 mmol) Ac 2O were added to
a stirred solution of 32 mg K5CoW12O40 Á 3H2O ꢀ0.01 mmol) in 3 cm3 CH3CN. The mixture was
stirred at room temperature for 5 min. After completion of the reaction ꢀmonitored by GC or TLC)
the catalyst was ®ltered and the reaction mixture was washed with 10% NaHCO3. Diethyl ether was
added, and after separation of phases the organic solution was dried over Na2SO4. Evaporation of the
organic solvent was followed by column chromatography on silica gel using petroleum ether as
eluent. Benzyl acetate was obtained in 98% yield ꢀTable 1, entry 1). The catalyst was reused seven
times and then showed a small loss of activity ꢀyield: 85%).
Acknowledgements
We are grateful to the Isfahan University Research Council for partial support of this work.
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