Catalytic synthesis of cinnamic esters with solid acids

Syntheses of cinnamic esters catalyzed by solid acids such as sulphate and ion-exchanged resin were surveyed.Studies indicated,the cerium sulphate is the excellent catalyst in sulphates,the suitable molar ratio of cinnamic acid to ethanol is 1:5,the weight percentage of catalyst is 15%,the reaction time is 5h,and the conversion of cinnamic acid is above 92%.D072 is the excellent catalyst in ion-exchanged resins,the suitable molar ratio of cinnamic acid to ethanol is 1:6.25,the weight percentage of catalyst is 18%,the reaction time is 5h,and the conversion of cinnamic acid is above 92%.On the suitable conditions,the conversions of cinnamic acid are 92%～ 96% in the preparation of other esters such as methyl ester,propyl ester and butyl ester et al.Cerium sulphate could be reused three times and D072 could be resused more than eight times.