Side reaction of cellulose with common 1-alkyl-3-methylimidazolium-based ionic liquids |
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Authors: | Gerald Ebner |
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Institution: | University of Natural Resources and Applied Life Sciences Vienna (BOKU), Department of Chemistry, Muthgasse 18, A-1190 Vienna, Austria |
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Abstract: | Ionic liquids with 1-alkyl-3-methyl-imidazolium cations react at C-2 with cellulose at its reducing end, forming a carbon-carbon bond. The reaction is strongly catalyzed by bases, such as the commonly present impurities in ILs, imidazole, and 1-methylimidazole. The direct reaction was verified by means of 13C-isotopical labeling and with the help of an IL that carried a fluorescence label which was transferred to cellulose upon the reaction. In solutions of cellulose in alkylmethylimidazolium ILs, both the ionic liquid and the cellulose are evidently not inert. |
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Keywords: | Cellulose Aldopyranose Ionic liquids Imidazolium BMIM Reducing end Isotopic labeling Fluorescence labeling Size exclusion chromatography |
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