CAS Key Laboratory of Engineering Plastics and CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China; College of Chemistry, University of Chinese Academy of Sciences, Beijing 100049, China.
CAS Key Laboratory of Engineering Plastics and CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
Carbohydr Polym. 2022 Jun 15;286:119301. doi: 10.1016/j.carbpol.2022.119301. Epub 2022 Mar 1.
Herein, a striking anion-tunnel transfer effect was demonstrated in 1-butyl-3-methylimidazolium benzoate (BmimPhCOO) ionic liquid, so a rapid, mild and efficient benzoylation of cellulose is accomplished under catalyst-free condition in BmimPhCOO. In a wide temperature range of 20-80 °C, the equilibrium of reaction is reached within only 15 min, which is much faster than the reported acylation of cellulose. Furthermore, the resultant cellulose tribenzoates have excellent solubility in conventional organic solvents, thus they can be used to accurately reflect the molecular weight and dispersity index of cellulose raw materials by gel permeation chromatography. This method is suitable for various cellulose. Therefore, we found a new principle to realize the extremely-rapid acylation of cellulose, and proposed an effective approach to accurately determine the molecular weight parameters of cellulose.
在此，在 1-丁基-3-甲基咪唑苯甲酸盐（BmimPhCOO）离子液体中证明了一种显著的阴离子隧道转移效应，因此在无催化剂条件下，纤维素在 BmimPhCOO 中可快速、温和、高效地进行苯甲酰化。在 20-80°C 的较宽温度范围内，反应平衡仅在 15 分钟内达到，这比报道的纤维素酰化反应快得多。此外，所得的纤维素三苯甲酸酯在常规有机溶剂中具有极好的溶解性，因此它们可以通过凝胶渗透色谱法准确反映纤维素原料的分子量和分散指数。该方法适用于各种纤维素。因此，我们发现了一种实现纤维素极快速酰化的新原理，并提出了一种准确确定纤维素分子量参数的有效方法。
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