2.
    发明专利
    未知

    公开(公告)号:AT197707T

    公开(公告)日:2000-12-15

    申请号:AT95106153

    申请日:1995-04-25

    Applicant: BASF AG

    Abstract: The prepn. of 1-(Hetero)aryl-3-hydroxy-pyrazoles of formula (I) comprises mixing propiolic acid esters of formula R1C IDENTICAL CCOOR' (II) with (hetero)arylhydrazine derivs. of formula RNHNH2 (III) in an inert solvent; and then treating with a base at 0-60 degrees C. R = opt. substd. aromatic or heteroaromatic; n = 0, 1 or 2; R1 = a gp. which is stable under the reaction conditions; R' = alkyl, cycloalkyl or aryl.

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