SULFONAMIDE DERIVATIVES AND METHOD OF STRUGGLE AGAINST WEEDS Russian patent published in 1995 - IPC

FIELD: organic chemistry. SUBSTANCE: products: derivatives of sulfonamides of the formula (I) where A CH or N, R₁-C₁-C₄-alkyl or C₁-C₄-alkoxy, R₂-C₁-C₄-alkyl, C₁-C₄-alkoxy, halogen, R₃ hydrogen, C₁-C₆-alkyl, phenyl, benzyl, R₄-C₁-C₆-alkyl, benzyl, thienyl, phenyl possibly substituted with halogen, C₁-C₄-alkyl, C₁-C₄-haloidalkyl, C₁-C₄-haloidalkoxyl, nitro, C₁-C₄-alkoxycarbonyl, and compounds were used at concentration 1-10 kg/ha. Synthesized compounds were used in agriculture. EFFECT: improved method of synthesis. 8 cl