四氯化锡掺杂聚苯胺催化合成苯甲醛1,2-丙二醇缩醛

Catalytic Synthesis of Benzaldehyde 1,2-Propylene Acetal by using Polyaniline Doped with Stannic Chloride Pentahydrate

以PAn(聚苯胺)-SnCl4(四氯化锡)为催化剂,对苯甲醛和1,2-丙二醇为原料合成苯甲醛1,2-丙二醇缩醛进行了研究。探讨了PAn-SnCl4催化剂对缩醛反应的催化活性,表明PAn-SnCl4是合成苯甲醛1,2-丙二醇缩醛的良好催化剂。系统地研究了原料配比、催化剂用量、带水剂用量、反应时间诸因素对产品收率的影响,在醛醇物质的量比n(苯甲醛)∶n(1,2-丙二醇)=1∶1.8,催化剂用量占反应物料总质量的0.8%,带水剂环己烷用量为10mL,回流时间为2.5h的优化反应条件下,苯甲醛1,2-丙二醇缩醛的收率可达到87%以上。

Benzaldehyde 1.2-propanediol acetal was synthesized from benzaldehyde and 1,2-propanediol as raw materials in the presence of polyaniline doped with stannic chloride pentahydrate. The factors influencing the product yield were discussed and the optimum reaction conditions were found. Experimental result showed that polyaniline doped with stannic chloride pentahydrate was an excellent catalyst. With n（benzaldehyde） ：n（ 1,2- propanediol） = 1：1.8, w（polyaniline doped with stannic chloride pentahydrate） = 0. 8 %,cyclohexane 10mL. and reaction time 2.5h, yield of henzaldehyde 1,2-propanediol acetal was over 87%.