Homogeneous tritylation of cellulose in 1-butyl-3-methylimidazolium chloride
Homogeneous tritylation of cellulose in 1-butyl-3-methylimidazolium chloride
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DOI：
10.1002/mabi.200600253
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发表时间：
2007-04-10
影响因子：
4.6
通讯作者：
Schubert, Ulrich S.
中科院分区：
文献类型：
--
作者：
Erdmenger, Tina;Haensch, Claudia;Schubert, Ulrich S.
研究了以氯离子为抗衡离子的1-烷基-3-甲基咪唑类离子液体对纤维素的溶解性能，并考察了不同烷基链长对纤维素溶解性能的影响。烷基链长度从乙基到癸基逐渐变化，以确定结构溶解性能;观察到短链长度的明显奇偶效应。此外，纤维素的三苯甲基化在1-丁基-3-甲基咪唑氯化物中以吡啶为碱进行。通过元素分析和核磁共振氢谱研究了反应时间和三苯甲基氯与纤维素单体的比例对取代度的影响。使用6倍过量的三苯甲基氯，在3小时反应时间后获得约1的DS。
1-Alkyl-3-methylimidazolium-based ionic liquids, having chloride as a counter ion, were studied for cellulose solubility; and the influence of different alkyl chain lengths was also investigated. The alkyl chain length was incrementally varied from ethyl to decyl to determine structure-dissolution properties; a distinct odd-even effect was observed for short chain lengths. In addition, the tritylation of cellulose was performed in 1-butyl-3-methylimidazoliurn chloride using pyridine as base. The influences of reaction time and the ratio of trityl chloride per cellulose monomer unit on the degree of substitution were investigated in detail by elemental analysis and H-1 NMR spectroscopy. A DS of around 1 was obtained after 3 h reaction time using a six fold excess of trityl chloride.