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.

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.

公开(公告)号：DE59701168D1

公开(公告)日：2000-04-06

申请号：DE59701168

申请日：1997-12-22

Applicant: BASF AG

Inventor： GLUECK DR ,  GOETZ DR ,  GRUTKE DR ,  LAUN DR ,  WARZELHAN DR

IPC: C08G69/08 ,  C08G69/14 ,  C08G69/36