Add time:07/22/2019         Source:sciencedirect.com

Ruthenium tetroxide was used as a reagent for the oxidation of several different coals. Significant quantities of aliphatic, di-, tri- and tetracarboxylic acids as well as benzene di-, tri-, tetra- and pentacarboxylic acids were produced in these oxidation reactions. More than 100 products have been identified by g.c.-m.s. The yields of three abundant products, butanedioic acid, 1,2-benzenedicarboxylic and 1,2,4,5-benzenetetracarboxylic acid, were determined quantitatively by an isotope dilution technique and the yields of eleven other relatively abundant products were measured semiquantitatively by g.c.-m.s. A striking array of carboxylic acids are formed in this reaction, which selectively preserves the aliphatic portion of the coal. The product distribution depends upon the rank of the coal. Texas lignite, for example, produces the most diverse group of aliphatic acids, but the higher rank bituminous coals also provide significant quantities of these acids. The structural implications of the observations are discussed.

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