Dimethyl malonate useful as intermediates for medicines,agrochemicals and dyes,were pre-pared by old methods in out country.The yield of dimethyl malonate(based on Cl CH2COOH)was 65%.

• 丙二酸二甲酯是医药、农药和染料的中间体，目前国内老方法生产收率只有65%25（以氯乙酸为基础）。