Abstract
Coal extracts prepared using different pyridine extraction methods have been investigated using 13C CP/MAS, 1H CRAMPS and 1H liquid-state nuclear magnetic resonance spectroscopy. The results show that short and straight alkyl groups are transferred preferentially to the extract of the coal, but for the most part, the structural distribution in the extract resembles that of the original coal. Incorporation of the solvents, pyridine and THF, was observed to occur during the extraction procedure and/or the subsequent workup to isolate the extract. The information obtained from the different n.m.r. techniques was complementary.
Published Version
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