NMR characterization of cellulose acetate: chemical shift assignments, substituent effects, and chemical shift additivity.
作者： Hiroyuki Kono , Hisaho Hashimoto , Yuuichi Shimizu
DOI: 10.1016/J.CARBPOL.2014.11.004
关键词: Medicinal chemistry 、 Heteronuclear single quantum coherence spectroscopy 、 Chemical shift 、 Organic chemistry 、 Nuclear magnetic resonance spectroscopy 、 Cellulose acetate 、 Substituent 、 Dimethyl sulfoxide 、 Cellulose 、 Carbon-13 NMR 、 Chemistry
摘要: A series of cellulose acetates (CA) with degrees substitution (DS) ranging from 2.92-0.92 dissolved in dimethylsulfoxide (DMSO)-d6 and tetrabutylammonium fluoride (TBAF)/DMSO-d6 were investigated by two-dimensional NMR spectroscopy. The spectroscopic analysis allowed the determination (1)H (13)C chemical shifts eight anhydroglucose units (AGUs) that contain CA: 2,3,6-tri-, 2,3-di-, 2,6-di-, 3,6-di-, 2-mono-, 3-mono-, 6-mono-, unacetylated AGUs. comparative shift data revealed substituent effect acetyl groups at 2-, 3-, 6-positions on nuclei same AGU. In addition, additivity could be applied to CA because diacetylated triacetylated AGUs almost completely explained effects 6-positions.
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