Two low-rank coals of high content of sulphur and low sulphur content orthocoking coal were chosen as the subject of study. The process of reduction was carried out twice, for raw and demineralised, by the Radmacher method, coals. Elemental and spectral analyses of the initial coals and the products obtained from them were made. The solubility of the coals in dichloromethane and the average molecular weight of the extracts were determined. The degree of conversion of the coals studied to the products soluble in dichloromethane was found to be surprisingly high regarding the low-rank coals. A hypothesis is put forward that the high content of sulphur in low-rank coals can endow them with certain properties typical of coking coals.