Abstract
A procedure is described for finding the DP n of oligomers formed by the condensation of dimethyl pyridines and terephthalaldehyde, whose solubility is insufficient for the use of colligative methods. The proton magnetic resonance (PMR) spectra of such oligomers dissolved in trifluoroacetic acid can show closely grouped signals from the aromatic and CH protons and from the terminal groups CHO and Me. An exact algebraic analysis provides formulae from which the DP n and the fractions of the two kinds of end-groups can be calculated. The method is illustrated by an example and its validity tested by means of a “model” compound of known structure.
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