H_4SiW_(12)O_(40)-PAn催化合成异丁醛-1,2-丙二醇缩醛

Synthesis of iso-Butyraldehyde-1,2-Propanediol Acetal Using H_4SiW_(12)O_(40)-PAn as Catalyst

制备了H4SiW12O40(硅钨酸)-PAn(聚苯胺)催化剂。通过异丁醛和1,2-丙二醇为原料合成异丁醛-1,2-丙二醇缩醛,探讨了H4SiW12O40-PAn催化剂对缩醛反应的催化活性,较系统地研究了原料配比、催化剂用量、反应时间诸因素对产品收率的影响。实验结果表明,H4SiW12O40-PAn是合成异丁醛-1,2-丙二醇缩醛的良好催化剂,在n(1,2-丙二醇)/n(异丁醛)=1 5/1、催化剂用量为反应物料总质量的1 2%、环己烷为带水剂、反应时间1 0h的优化条件下,异丁醛-1,2-丙二醇缩醛的收率可达94 6%。

A new environmental benign catalyst,H_4SiW_(12)O_(40)-PAn was prepared.Iso-butyraldehyde-1,2-propanediol acetal was synthesized from iso-butyraldehyde and 1,2-propanediol in the presence of (H_4SiW_(12)O_(40)-PAn.)Factors influencing the synthesis were discussed.Optimum conditions were:mole ratio of 1,2-propanediol to iso-butyraldehyde(r),1.5/1;quantity of catalyst,1.2% of feed stock,and reaction time,1.0 h.H_4SiW_(12)O_(40)-PAn is an excellent catalyst for synthesizing iso-butyraldehyde-1,2-propanediol acetal,the yield can reach 94.6%.