Hirose Daisuke, Wardhana Kusuma Samuel Budi, Nomura Shuhei, Yamaguchi Makoto, Yasaka Yoshiro, Kakuchi Ryohei, Takahashi Kenji
Graduate School of Natural Science and Technology, Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan
Division of Molecular Science, Graduate School of Science and Technology, Gunma University 1-5-1 Tenjin-cho Kiryu 376-8515 Gunma Japan.
RSC Adv. 2019 Jan 31;9(7):4048-4053. doi: 10.1039/c8ra10042j. eCollection 2019 Jan 25.
The role of 1-ethyl-3-methylimidazolium (Emim) carboxylate-type ionic liquid (IL) as the solvent and organocatalyst for transesterification reaction of cellulose was investigated. The reported method using Emim acetate and vinyl ester caused an undesired side reaction: the acetate anion derived from EmimOAc was introduced into cellulose ester. To improve the reaction system, ILs with a high cellulose solubility, a high degree of substitution (DS) value, and low side-reaction were systematically explored. Newly synthesized Emim -anisate and a mixed solvent system achieved the transesterification reaction of cellulose with a high DS value derived from the employed vinyl esters (DS > 2.9), and a low DS value derived from side reaction (selectivity > 99%).
研究了1-乙基-3-甲基咪唑鎓（Emim）羧酸盐型离子液体（IL）作为纤维素酯交换反应的溶剂和有机催化剂的作用。报道的使用乙酸Emim和乙烯基酯的方法会引发不期望的副反应：源自EmimOAc的乙酸根阴离子会引入到纤维素酯中。为改进反应体系，系统地探索了具有高纤维素溶解度、高取代度（DS）值和低副反应的离子液体。新合成的Emim -茴香酸盐和混合溶剂体系实现了纤维素与所用乙烯基酯衍生的高DS值（DS > 2.9）以及副反应衍生的低DS值（选择性> 99%）的酯交换反应。
