Upper Freeport coal was extracted using a mixture of carbon disulfide and N-methyl-2-pyrrolidinone (CS2/NMP) under ultrasonic irradiation at room temperature. The CS2/NMP-soluble fraction (CS2/NMP-S) was further extracted with THF, leading to THF-soluble fraction (THF-S) and -insoluble fraction (THF-IS). The thermal reactivity of these extracts from coal was evaluated by flash pyrolysis at 170-764 degreesC under an inert atmosphere using a Curie-point pyrolyzer (CPP). The volatile yield for the soluble fraction after CS2/NMP extraction, as well as THF extraction, was higher than that for the insoluble fraction. The CS2/NMP-soluble fraction was hydrogenated using a Ru/Al2O3 catalyst at 120 degreesC at a hydrogen pressure of 10 MPa. The aromatic structures in extracts were partially hydrogenated and the acetic acid was introduced into extracts without significant decomposition of the structure during the catalytic hydrogenation. The thermal reactivity of extracts was enhanced by this catalytic hydrogenation. This can be explained by the conversion of C=C bonds to C-C bonds in aromatic structure and the release of compounds with carboxy groups introduced into extracts.