Abstract
High resolution 13C n.m.r. proton noise decoupled (75.5 MHz) spectra have been recorded for a series of nitrated celluloses and denitrated cellulose nitrates. From the detailed spectral assignments an analysis of the partial degrees of substitution and distribution of nitrate groups in the β-D-glucopyranose residues is presented. The data are compared with the predictions of a model based on the constancy of ratio of three equilibrium constants for nitration—denitration at the C2, C3 and C6 positions for differently substituted β-D-glucopyranose residues and it is shown that the situation is considerably more complex than provided for by the model. Analysis of the anomeric 13C carbon region produces some sequence information which indicates non-random distribution of nitrate ester groups.
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