壳聚糖负载单质碘催化合成环己酮1,2-丙二醇缩酮

室温下合成壳聚糖负载单质碘,经红外光谱、X射线衍射和热重分析进行表征,并对壳聚糖负载单质碘催化环己酮与1,2-丙二醇的缩酮化反应进行研究。考察了反应时间、醇酮物质的量比、催化剂质量、带水剂体积等因素对环己酮1,2-丙二醇缩酮收率的影响。实验结果表明,在回流条件下,环己酮物质的量为0.1mol,醇酮物质的量比为1.3,催化剂质量为0.4g,带水剂环己烷体积为8mL,反应时间为60min,缩酮收率可达到96.3%。催化剂重复使用5次后,催化效果未见明显降低。

Catalytic Synthesis of Cyclohexanone 1,2-Propylene Ketal by Chitosan Supported With Iodine

Chitosan supported with Iodine was synthesized at room temperature and the structure was characterized by IR, XRD,and TGA.Ketalization of cyclohexanone and 1,2-propanediol catalyzed by chitosan supported with iodine was studied. The effect of reaction time,the ratio of alcohol and ketone,catalyst amount,and the volume of water-carrying agent on the yield of cyclohexanone 1,2-propylene ketal were investigated.The results show that the suitable condition for the reaction are as follows:the amount of cyclohexanone is 0.1 mol,the molar ratio of 1,2-propanediol and cyclohexanone is 1.3,the amount of catalyst is 0.4 g,the volume of cyclohexane used as the wate-carrying agent is 8 mL,reaction time is 60 min.The ketal yield is up to 96.3%.The catalyst could be reused five times without significant declining of catalytic activity.