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首页> 外文期刊>Journal of Applied Polymer Science >REACTION OF 6-BROMO-6-DEOXYCELLULOSE WITH THIOLS IN LITHIUM BROMIDE-N,N-DIMETHYLACETAMIDE
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REACTION OF 6-BROMO-6-DEOXYCELLULOSE WITH THIOLS IN LITHIUM BROMIDE-N,N-DIMETHYLACETAMIDE

机译：6-溴-6-脱氧纤维素与硫醇在溴化-N，N-二甲基乙酰胺酸锂中的反应

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摘要

Nucleophilic substitution reactions of 6-bromo-6-deoxycelluloses of high degrees of substitution with eight thiols having functional groups such as carboxyl and amino groups were studied under homogeneous conditions in LiBr-N,N-dimethylacetamide in the presence of triethylamine. The reactions under the homogeneous conditions proceeded more extensively than those run under heterogeneous conditions in aqueous alkaline solutions. The reactivity of thiols was found to increase with increasing acidity of the mercapto groups of the thiols. Reaction products with 2-mercaptobutanedioic acid and with 2-mercaptobenzoic acid were soluble in alkaline and neutral water but not in 1 N HCl, while the reaction products with 2-aminoethanethiol did not dissolve even in 1 N HCl. The reaction products with cysteine showed amphoteric behavior. (C) 1996 John Wiley & Sons, Inc. [References: 24]
机译：在三乙胺的存在下，在均相条件下，研究了高取代度的6-溴-6-脱氧纤维素与具有羧基和氨基等官能团的八个硫醇的亲核取代反应。在均相条件下的反应比在非均相条件下在碱性水溶液中进行的反应更广泛地进行。发现硫醇的反应性随硫醇的巯基的酸性增加而增加。与2-巯基丁二酸和2-巯基苯甲酸的反应产物可溶于碱性和中性水，但不溶于1 N HCl，而带有2-氨基乙硫醇的反应产物甚至不溶于1 N HCl。与半胱氨酸的反应产物表现出两性行为。 （C）1996 John Wiley＆Sons，Inc. [参考：24]

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