PROCESS FOR PREPARATION OF SUBSTITUTED PYRIDAZON DERIVATIVES

    公开(公告)号:KR820001237B1

    公开(公告)日:1982-07-07

    申请号:KR790000582

    申请日:1979-02-24

    Applicant: BASF AG

    Abstract: Title compds. [I; R,R1 = lower alkoxy, R2 = difluoromethyl, fluoro, chloro, X-R4 (X = O, S; R4 = C1-3 haloalkyl); R3 = H, fluoro: A = halogen, alkoxy; Hal = halogen; B = Na, K , useful as active component of herbicide, were prepd. by reaction of pyridazone derivs.(II) and alcoholate(III) in the presence of org. liquid. Thus, 30 wt% sodium methylate soln. 7.2 parts was condensed under the vacuum, made in slurry with toluene 250 parts, 1-(3-trifluoromethylthiophenyl)-4-methoxy-5-chloropyridazone-6 was added, refluxed 2 hr, filtered, recrystallized to give 1-(3-trifluoromethylthiophenyl)-4,5-dimethoxypyridazone-6 5.9 parts.

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