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顺丁烯二酸酐与苯在三氯化铝的存在下,经傅-克反应生成苯甲酰丙烯酸,在强酸性水介质中,若温度高于35℃,则部分发生与水的加成反应生成苯甲酰乳酸。含苯甲酰乳酸的苯甲酰丙烯酸在浓硫酸的存在下与无水乙醇反应,可分别生成苯甲酰丙烯酸乙酯和苯甲酰乳酸乙酯。而苯甲酰乳酸乙酯在二甲苯中回流可脱去一分子水而转变为苯甲酰丙烯酸乙酯,从而使苯甲酰丙烯酸乙酯的纯度从85%提高到93%。
Maleic anhydride and benzene in the presence of aluminum trichloride, Fu - grams reaction of benzoyl acrylic acid, strong acid aqueous medium, if the temperature is higher than 35 ℃, the partial reaction with water occurs Generate benzoyl lactic acid. Benzoylacrylic acid containing benzoyllactate reacted with absolute ethanol in the presence of concentrated sulfuric acid to form ethyl benzoyl acrylate and ethyl benzoyl lactate, respectively. The ethyl benzoyl lactate refluxed in xylene can take off one molecule of water and converted to ethyl benzoyl acrylate, so that the purity of ethyl benzoyl acrylate increased from 85% to 93%.