磷钨酸掺杂聚苯胺催化剂催化合成苹果酯-B

Catalytic synthesis of ethyl acetoacetate 1,2-Propanediol ketal with H_3PW_(12)O_(40)/PAn

报道了磷钨酸掺杂聚苯胺催化剂H3PW12O40/PAn的制备,通过乙酰乙酸乙酯和1,2-丙二醇反应合成了苹果酯-B,探讨了磷钨酸掺杂聚苯胺催化剂对缩酮反应的催化活性,较系统地研究了原料量比,催化剂用量,反应时间诸因素对产品收率的影响.实验表明:磷钨酸掺杂聚苯胺催化剂是合成苹果酯-B的良好催化剂,在n(乙酰乙酸乙酯)∶n(1,2-丙二醇)=1∶1 5,催化剂用量为反应物料总质量的1 0%,环己烷为带水剂,反应时间50min的优化条件下,苹果酯-B的收率可达85 0%.

Ethyl acetoacetate 1,2-propanediol ketal was synthesized from ethyl acetoacetate and 1,2-propylene glycol in the presence of H_3PW_(12)O_(40)/PAn.The factors influencing the synthesis were discussed and the optimum conditions were found out.The optimum conditions are:molar ratio of ethyl acetoacetate to 1,2-propylene glycol was 1∶1.5,the quantity of catalyst was equal to 1.0% of feed stocks,and the reaction time was 50 min.H_3PW_(12)O_(40)/PAn was an excellent catalyst for synthesizing ethyl acetoacetate 1,2-propanediol ketal and its yield can reach over 85.0%.