FIELD: organic chemistry, chemical technology. SUBSTANCE: invention relates to method for preparing 4-methyl-5-formylthiazole by oxidation of 4-methyl-5-(2- hydroxyethyl)-thiazole with chrome oxide or inorganic bichromates an aqueous solution in the presence of sulfuric acid. Oxidation is carried out in two-phase system water organic solvent at temperature 20-50 C. Diethyl ether, benzene, chloroform and methylene chloride are used as an organic solvent. Invention provides the new method for preparing 4-methyl-5-formylthiazole. EFFECT: improved preparing method. 3 cl, 12 ex
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