HYDROXAMIC ACID DERIVATIVES AND ACID ADDITION SALTS THEREOF (VARIANTS) Russian patent published in 1997 - IPC

FIELD: chemical industry. SUBSTANCE: hydroxamic acid derivatives of general formula given in the specification in which m=0 and 2; x is halogen; R is phenyl which is substituted by (C_I- C₄) alkoxy, or pyridyl; R¹ is hydrogen of (C_I-C₅)-alkyl; R² is (C_I- C₅) alkyl, (C₅-C₇) cycloalkyl or R¹ and R² taken together with nitrogen atom to which they are attached form heterocyclic radical, and acid addition salts thereof are prepared either by treatment of compound of general formula VII given in the specification, wherein R¹- R² are as defined above, with halogenaling agent followed by hydrolysis in aqueous alkaline medium and recovery of the desired product in the form of base or acid addition salt, or by diazotization of compound of general formula (II) given in the specification followed by decomposition of the resulting diazonium salt and recovery of the desired product in the form of base ar acid addition salt. EFFECT: more efficient preparation methods. 4 cl