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乙氧甲叉丙二酸二乙酯是由丙二酸二乙酯和原甲酸三乙酯在乙酸酐和氯化锌催化下缩合而成的,收率97.3％(以丙二酸二乙酯计算)。原甲酸三乙酯的投料量是过量的,没反应的原甲酸三乙酯回收后套用在下一釜反应中。
Diethyl ethoxymethylenemalonate is formed by the condensation of diethyl malonate and triethyl orthoformate catalyzed by acetic anhydride and zinc chloride in a yield of 97.3% (calculated as diethyl malonate). The amount of triethyl orthoformate fed is excessive, and the unreacted triethyl orthoformate is recovered and applied to the next reaction.