Catalysts for the Hydroalkylation of Benzene, Toluene and Xylenes

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The catalytic hydroalkylation of benzene over palladium and fused salt (NaCl-AlCl_3) was examined under hydrogen pressure. The combination catalyst of palladium and fused salt showed good activity for hydroalkylation, providing cyclohexylbenzene as the main product, with a small amount of bicyclohexyl. With 0.24% palladium supported on alumina, suitable reaction conditions were : a temperature of 120-140°, and a reaction time of 5-10 hr in the presence of fused salt (NaCl-AlCl_3 ; molar ratio 1 : 1). Under these conditions, the yields of cyclohexylbenzene and bicyclohexyl were 54.7 and 5.1%, respectively. This catalyst system was applied to the hydroalkylation of toluene, xylenes and trimethylbenzenes. Based on the behavior of the fused salt, we suggest that NaAlCl_4 represents an active species in the hydroalkylation reaction.
公益社団法人日本薬学会の論文
1981-01-25