4-二甲氨基吡啶催化离子液体中纤维素的高效丙酰化和丁酰化。
Highly efficient propionylation and butyralation of cellulose in an ionic liquid catalyzed by 4-dimethylminopyridine.
机构信息
School of Material Science and Engineering, BeiHang University, Beijing 100191, China.
出版信息
Carbohydr Polym. 2013 Jan 30;92(1):307-11. doi: 10.1016/j.carbpol.2012.08.111. Epub 2012 Sep 19.
Using 4-dimethylaminopyridine (DMAP) as the catalyst, highly efficient propionylation and butyralation of cellulose were successfully carried out in an ionic liquid 1-allyl-3-methylimidazolium chloride (AmimCl) under mild conditions. Cellulose propionate (CP) and cellulose butyrate (CB) with a degree of substitution (DS) in the range from 0.89 to 2.89 were synthesized within only 30 min at 30 °C. The DS values of the products could be well controlled just by molar ratio of acid anhydride/anhydroglucose unit (AGU). More interestingly, the conversions of acid anhydrides in both propionylation and butyralation were as high as above 90%, even 96%. Therefore, this work provides a facile and highly efficient way for the synthesis of cellulose esters CP and CB.
使用 4-二甲氨基吡啶（DMAP）作为催化剂，在温和条件下，在离子液体 1-烯丙基-3-甲基咪唑氯化物（AmimCl）中成功地将纤维素进行了高效的丙酸化和丁酸化。在 30°C 下仅 30 分钟内，合成了取代度（DS）在 0.89 到 2.89 范围内的纤维素丙酸酯（CP）和纤维素丁酸酯（CB）。通过酸酐/无水葡萄糖单元（AGU）的摩尔比可以很好地控制产物的 DS 值。更有趣的是，丙酸化和丁酸化中酸酐的转化率均高达 90%以上，甚至高达 96%。因此，这项工作为 CP 和 CB 这两种纤维素酯的合成提供了一种简便、高效的方法。
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