INTERMEDIATE PRODUCTS FOR OBTAINING PYRIDAZINE HERBICIDES AND METHOD FOR PRODUCTION THEREOF Russian patent published in 2021 - IPC C07D237/16 C07D401/12 C07D405/04 C07D405/14 C07D409/04 C07D409/14 C07D213/71 

FIELD: chemistry.

SUBSTANCE: the invention relates to a process for the preparation of compounds of Formula 1, wherein R1 is H, C1-C7 alkyl, C3-C7 alkenyl, C3-C7 alkynyl, C3-C7 cycloalkyl or C4-C7 cycloalkylalkyl; R2 is C1-C7 alkyl, C3-C7 cycloalkyl, C4-C7 cycloalkylalkyl or C2-C7 alkoxyalkyl; X means S; or X is -C (R6) = C (R7) -, wherein the carbon bonded to R6 is also bonded to the carbon bonded to R4 and the carbon bonded to R7 is also bonded to the phenyl ring moiety in Formula 2 ; each R3 independently means H, halogen, C1-C5 alkyl, C3-C5 cycloalkyl, or C1-C5 alkoxy; n is 0, 1, 2 or 3. The process is carried out by hydrolysis of an intermediate of Formula 2. The invention also relates to intermediates of Formulas 2, 4 and methods for their preparation.

EFFECT: The technical result is the production of Formula 1 compounds with herbicidal properties.

9 cl, 10 tbl, 2 ex