FIELD: chemical industry. SUBSTANCE: present invention describes method of preparing substituted 1,4-dihydro-4- oxo-2 and 3-quinolino-carboxylic acid. The claimed method comprises heating ester selected from group consisting of substituted or unsubstituted aniline methylene malonates, aniline fumarates, aniline maleates and mixture thereof in the presence of chlorosulfonic acid, oleum and mixture thereof. EFFECT: more efficient preparation method. 20 cl, 1 tbl
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