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通过Perkin法合成肉桂酸,主要考察苯甲醛与乙酸酐的物质的量比、反应时间、苯甲醛与催化剂物质的量比及催化剂种类对合成肉桂酸产率的影响。结果表明,当苯甲醛和乙酸酐的物质的量比为1.0∶3.0、回流时间为80min、苯甲醛与催化剂物质的量比为1.0∶1.0、催化剂为无水碳酸钾、反应温度为160～170℃时,肉桂酸的产率达75.4%。故选取合适的溶剂和工艺条件,用苯甲醛和乙酸酐作为原料可以得到较高产率。
Perkin method was used to synthesize cinnamic acid. The effects of the ratio of benzaldehyde to acetic anhydride, the reaction time, the ratio of benzaldehyde to catalyst and the type of catalyst on the yield of cinnamic acid were investigated. The results showed that when the molar ratio of benzaldehyde and acetic anhydride was 1.0: 3.0, the reflux time was 80 min, the molar ratio of benzaldehyde to catalyst was 1.0:1.0, the catalyst was anhydrous potassium carbonate and the reaction temperature was 160-170 ℃, the yield of cinnamic acid reached 75.4%. Therefore, select the appropriate solvent and process conditions, with benzaldehyde and acetic anhydride as raw materials can be a higher yield.