【摘要】 探讨磷钨酸对苹果酯合成反应的催化活性,研究了带水剂用量、催化剂用量、乙酰乙酸乙酯与乙二醇的物质的量之比、反应时间等因素对产品收率的影响。实验表明:磷钨酸是合成苹果酯的优良催化剂,在n(乙酰乙酸乙酯):n(乙二醇)为1:1.5,催化剂用量为反应物总量的0.5％,环己烷作带水剂,反应时间为1.0 h的优化条件下,苹果酯的收率可达82.2％。更多还原

【Abstract】 Ethyl acetoacetate ethylene ketal was synthsized from ethyl acetoacetate and glycol in the presence of phosphotungstic acid. The factors influencing the synthesis were discussed and the best conditions were found out. The optimum conditions are: molar ratio of ethyl acetoacetate to glycol is 1:1. 5, the quantity of catalyst is equal to 0. 5% of feed stocks, and the reaction time is 1. 0 h. Phosphotungstic acid is an excellent catalyst for synthesizing ethyl acetoacetate ethylene ketal and its yield can reach over 82. 2 %.更多还原