Summary
A facile method to determine the distribution of methyl groups in regioselectively methylated celluloses on anhydroglucose unit was developed using solution 1H-NMR analysis. The determination was deduced from the assignment of the signals of each proton, which directly attached to the glucopyranose ring carbon for partially methylated 2,3-di-O-methylcellulose samples observed in D2O. These data for the distribution of the methyl groups corresponded to those based on the gas-chromatographic analysis. This method using the 1H-NMR spectroscopy can facilitate the measurements of the distribution of methyl groups for randomly substituted and commercially available O-methylcelluloses.
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Received: 24 August 2000/ Revised version: 10 July 2001/ Accepted: 23 December 2001
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Sekiguchi, Y., Sawatari, C. & Kondo, T. A facile method of determination for distribution of the substituent in O-methylcelluloses using 1H-NMR spectroscopy. Polymer Bulletin 47, 547–554 (2002). https://doi.org/10.1007/s002890200020
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DOI: https://doi.org/10.1007/s002890200020