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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
Inventor: MAYWALD DR , HARTMANN HORST , GOETZ DR , REISSENWEBER DR , KOENIG DR
IPC: C07D307/33 , C07D407/04
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.
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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
Inventor: KOENIG DR , GOETZ DR , KIRSTGEN DR , MUELLER DR , OBERDORF DR
IPC: C07D231/18 , C07D231/22
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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