K_5CoW_(12)O_(40)·3H_2O催化合成环己酮1,2—丙二醇缩酮

研究了杂多化合物K_5CoW_(12)O_(40)·3H_2O作为催化剂对环己酮和1,2-丙二醇缩酮的催化活性。系统考察了酮醇物质的量比、催化剂质量、带水剂体积、反应时间和催化剂重复使用性等因素对产品收率的影响。实验结果表明,杂多化合物K_5CoW_(12)O_(40)·3H_2O是合成环己酮1,2-丙二醇缩酮的良好催化剂,在酮醇物质的量比为1:1.4、催化剂质量为0.5 g、带水剂环己烷体积为9 mL、反应时间为70 min的最佳条件下,环己酮1,2-丙二醇缩酮的收率最高可达94.2%。

Synthesis of Cyclohexanone1,2-Propylene Ketal Catalyzed by Potassium Dodecatungstocobaltate Trihydrate

The catalytic activity of potassium dodecatungstocobaltate trihydrate(K_5CoW_(12)O_(40)·3H_2O) on the reaction between cyclohexanone and 1,2-propylene ketal.The effects of the cyclohexanone/1,2-propylene alcohol molar ratio,the amount of the catalyst agent and water-carrying agent,the reaction time,the using regenerated catalyst on the yield of Cyclohexanone1,2-propylene ketal were systematically investigated.The results show that potassium dodecatungstocobaltate trihydrate(K_5CoW_(12)O_(40)·3H_2O) is a good water-carrying agent for the reaction between cyclohexanone and 1,2-propylene ketal.The results showed that the suitable condition for the reaction are as follows:benzaldehyde/1,2-propylene molar ratio is 1:1.4,the amount of potassium dodecatungstocobaltate trihydrate(K_5CoW_(12)O_(40)·3H_2O) is 0.5 g,the volume of cyclohexane is 9 mL,and reaction time is 70 min.The maximum yield of benzaldehyde 1,2-propylene ketal is up to 94.2%.