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The direct carbonylation of benzene to benzaldehyde, for the first time, was achieved in the presence of chloroaluminate ionic liquids, with relatively high yield (up to 91%) and selectivity (ca. 96%). Under this reaction conditions diphenylmethane was the only by-product. The reuse of the ionic liquids was also studied.
The oxidation of benzyl alcohol to benzaldehyde has been investigated in the absence of solvent using zeolite-supported Au and Au–Pd catalysts. Three zeolites were investigated, ZSM-5, zeolite β and zeolite Y, and these were contrasted with the titanoslicalite TS-1 and TiO2 as supports. For the Au catalysts the best results are obtained with zeolite β as the support and the conversions were comparable...
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