2-甲基萘酰基化制备2-甲基-6-丙酰基萘工艺研究
The reaction process of 2-methylnaphthaloylation to synthesize 2-methyl-6-propionyl naphthalene
以2-甲基萘(2-MN)为原料,系统探究了AlCl3、FeCl3和ZnCl2等一系列路易斯酸催化剂对酰基化反应的影响,同时对反应条件进行优化,考察反应温度、反应时间对酰基化反应产物中2-甲基-6-丙酰基萘(2,6-MPN)选择性的影响。结果发现,AlCl3表现出了较好的催化活性,在反应温度为20℃,反应时间为5 h,2-MN、丙酰氯(PC)、AlCl3的摩尔比为1∶1.4∶1.7时,2-MN转化率为100%,2,6-MPN选择性达92%,且2,6-MPN与2-甲基-7-丙酰基萘(2,7-MPN)的选择性之比可达到11.5∶1。进一步采用连续减压精馏装置,通过减压精馏和重结晶相结合的方法对反应产物进行分离提纯,结果发现,此方法显著提高了2,6-MPN分离效率,提升了2,6-MPN收率,经重结晶提纯后2,6-MPN纯度可达到99%。
In this paper,2-methylnaphthalene (2-MN) was used as raw material to systematically explore the effects of a series of Lewis acid catalysts such as AlCl3,FeCl3 and ZnCl2 on the acylation reaction,at the same time,the reaction conditions were optimized,and the effects of reaction temperature and reaction time on the selectivity of 2-methyl-6-propionylnaphthalene (2,6-MPN) in the acylation reaction products were investigated.The results showed that AlCl3 exhibited good catalytic activity,when the reaction temperature is 20℃,the reaction time is 5 h,and the molar ratio of 2-MN,propionyl chloride(PC),and AlCl3 is 1∶1.4∶1.7,the conversion rate of 2-MN was 100%,the selectivity of 2,6-MPN was 92%,and the selectivity ratio of 2,6-MPN to 2-methyl-7-propionyl naphthalene (2,7-MPN) could reach 11.5∶1.Furthermore,the continuous vacuum distillation device was used to separate and purify the reaction products by combining vacuum distillation and recrystallization.The results showed that this method significantly improved the separation efficiency and yield of 2,6-MPN,and the purity of 2,6-MPN could reach 99% after recrystallization purification.
2-甲基萘 / 减压精馏与重结晶 / 路易斯酸 / 2-甲基-6-丙酰基萘 / Friedel-Crafts酰基化反应
2-methylnaphthalene / vacuum distillation and recrystallization / Lewis acid / 2-methyl-6-propionyl naphthalene / Friedel-Crafts acylation reaction
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国家自然科学基金资助项目(22378026)
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