Abstract
An appreciable amount of acidic substances was extracted from a Japanese lignite using concentrated sodium hydroxide. Long-chain alkanes were found in their hydrogenated products. Their structure and reactivity for the hydrogenolysis suggested that the precursors of n-alkanes were the long-chain alkyl groups bound directly and through ketones to aromatic rings, the presence of which was confirmed in the extracts. In contrast, fatty acids could be excluded as the source of n-alkanes. Thus, the source for n-alkanes found in the coal liquid is elucidated.
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