1.
    发明专利
    未知

    公开(公告)号:DE59902100D1

    公开(公告)日:2002-08-29

    申请号:DE59902100

    申请日:1999-09-02

    Applicant: BASF AG

    Abstract: Separation of impurities from 3-(2'-acetoxyethyl)-dihydro-2(3H)-furanone (I) obtained by acetylation of 3-(2'-hydroxyethyl)-dihydro-2(3H)-furanone comprises first separating high boiling impurities and subjecting the recovered distillation head product to a further step in which light and medium boiling components are taken off at the head and recovering pure (I) as the sump product.

    2.
    发明专利
    未知

    公开(公告)号:DE59508867D1

    公开(公告)日:2000-12-28

    申请号:DE59508867

    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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