...
首页> 外文期刊>Macromolecular Symposia >Comparison of Benzyl Celluloses Synthesized in Aqueous NaOH and Dimethyl Sulfoxide/Tetrabutylammonium Fluoride†
【24h】

Comparison of Benzyl Celluloses Synthesized in Aqueous NaOH and Dimethyl Sulfoxide/Tetrabutylammonium Fluoride†

机译:NaOH和二甲基亚砜/四丁基氟化铵合成的苄基纤维素的比较†

获取原文
获取原文并翻译 | 示例
           

摘要

Cellulose was benzylated starting from the dissolved polymer in dimethyl sulfoxide (DMSO)/tetrabutylammonium fluoride trihydrate (TBAF) and heterogeneously in aqueous NaOH as reaction media. Differences in the distribution of benzyl moieties within the anhydroglucose unit in dependence on the synthesis pathway couldn't be found. However, as revealed by means of 1H-NMR spectroscopy, significant differences in the distribution of substituents along the cellulose chains occurred. Conventionally synthesized samples (in aqueous NaOH), even in the presence of a phase transfer catalyst, possess a block-wise distribution of substituents, while a dissolution of cellulose in DMSO/TBAF prior to the reaction gives products that are uniformly substituted along the cellulose chains.
机译:从溶于二甲基亚砜(DMSO)/四丁基氟化铵三水合物(TBAF)中的溶解的聚合物开始,然后在作为反应介质的NaOH水溶液中进行异构化,对纤维素进行苄基化。找不到依赖于合成途径的脱水葡萄糖单元内苄基部分的分布差异。但是,如通过 1 1H-NMR光谱所揭示的,取代基沿纤维素链的分布发生了显着差异。常规合成的样品(在NaOH水溶液中),即使在相转移催化剂存在下,也具有取代基的逐段分布,而反应前纤维素在DMSO / TBAF中的溶解会产生沿纤维素均匀取代的产物链。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号