Polymer‐supported catalysts—selective hydrogenation of acid chlorides over palladium/polyamide

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Abstract
The catalytic behaviour of palladium supported on aromatic polyamides was studied in the liquid phase hydrogenation of benzoyl chloride at 1 atm total pressure and between 348 and 408 K. The specific activity of the catalysts as a function of palladium concentration was found to increase with metal loading. It is suggested that palladium in a metallic state is the active site for the acid chloride hydrogenation. A decrease in the reaction rate has been observed at the highest temperatures indicating that under these conditions the availability of hydrogen becomes the rate determining step. Results on the liquid phase hydrogenation of acyl‐ and aroyl‐chlorides are reported. No strong influence of the nature of the substituents was observed on reaction parameters.

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