H_3PW_6Mo_6O_(40)/SiO_2催化合成苯甲醛1,2-丙二醇缩醛

Catalytic synthesis of benzaldehyde 1,2-propanediol acetal by H_3PW_6Mo_6O_(40)/SiO_2

以二氧化硅负载磷钼钨酸H3PW6Mo6O40/SiO2为催化剂,苯甲醛和1,2-丙二醇为原料合成苯甲醛1,2-丙二醇缩醛.探讨H3PW6Mo6O40/SiO2对缩醛反应的催化活性,较系统地研究了醛醇物质的量比、催化剂用量、带水剂用量、反应时间等因素对产品收率的影响.实验表明:H3PW6Mo6O40/SiO2是合成苯甲醛1,2-丙二醇缩醛的良好催化剂,在n(苯甲醛)∶n(1,2丙二醇)=1∶1.5,催化剂用量为占总反应物质量的1.0%,带水剂环己烷用量10 mL,反应时间45 min的最佳条件下,苯甲醛1,2-丙二醇缩醛的收率可达83.3%.

Benzaldehyde 1,2- propanediol acetal was synthesized from benzaldehyde and 1,2 -propanediol in the presence of H3PW6Mo6O40/SiO2 as catalyst. The factors influencing the synthesis were discussed and the best reaction conditions were found out. Experimental results showed that H3PW6Mo6040/SiO2 is an excellent catalyst. The optimum conditions are ： molar ratio of benzaldehyde to 1,2 - propanediol is 1 ： 1.5, the quantity of catalyst is equal to 1.0% of feed stocks, the volume of cyclohexane as the water - carrying agent is 10 mL and the reaction time is 45 min. Under these conditions, the yield of benzaldehyde 1,2 - propanediol acetal can reach 83.3 %.