公开(公告)号：DE4435176A1

公开(公告)日：1996-04-04

申请号：DE4435176

申请日：1994-09-30

Applicant: BASF AG

Inventor： GROENING CARSTEN DR ,  EBEL KLAUS DR ,  KAIBEL GERD DR ,  THERRE JOERG DR ,  KOOPMANN JUERGEN DR ,  MENIG HELMUTH DR ,  FRITZ GERHARD DR ,  DIETZ RAINER

IPC: B01J31/08 ,  C07B61/00 ,  C07C45/64 ,  C07C45/71 ,  C07C45/84 ,  C07C49/175

Abstract: Prepn. of methyl glyoxal dimethyl acetal comprises reacting methyl glyoxal and methanol in the presence of a catalyst, in which the acetal is recovered by heating in the presence of water to bring about azeotropic distillation.

公开(公告)号：AT253542T

公开(公告)日：2003-11-15

申请号：AT01120387

申请日：2001-08-25

Applicant: BASF AG

Inventor： THERRE JOERG DR ,  KAIBEL GERD DR ,  AQUILA WERNER DR ,  WEGNER GUENTER DR ,  FUCHS HARTWIG

IPC: C07C41/50 ,  C07B61/00 ,  C07C41/56 ,  C07C41/58 ,  C07C43/303

Abstract: Preparation of acetals by reaction of 1 mol. of an unsaturated aldehyde with 1 mol. of an unsaturated alcohol in presence of an acid as catalyst and with separation of the water of reaction is effected by partly reacting the reactants in a column, concentrating the obtained acetal in ≥ 2 sequential evaporation steps and then recycling the recovered reactants to the reaction column. Preparation of acetals (I) by reaction of 1 mol. of an unsaturated aldehyde (II) with 1 mol. of an unsaturated alcohol (III) in presence of an acid as catalyst and with separation of the water of reaction is effected by partly reacting the reactants in a column, concentrating the obtained acetal in ≥ 2 sequential evaporation steps and then recycling the recovered reactants to the reaction column. R - R = H or optionally substituted 1-6C alkyl; and R = H, an optionally mono- or poly-unsaturated, optionally substituted 1-12C alkyl or an optionally substituted 3-12-membered optionally mono- or poly-unsaturated carbon ring.

公开(公告)号：AT232193T

公开(公告)日：2003-02-15

申请号：AT99118458

申请日：1999-09-17

Applicant: BASF AG

Inventor： THERRE JOERG DR ,  KAIBEL GERD DR ,  AQUILA WERNER DR ,  WEGNER GUENTER DR ,  FUCHS HARTWIG

IPC: B01J27/16 ,  C07B61/00 ,  C07C41/28 ,  C07C43/15 ,  C07C45/37 ,  C07C45/51 ,  C07C45/54 ,  C07C45/67 ,  C07C47/21 ,  C07C49/203

Abstract: Preparation of citral (I) comprises thermal decomposition of 3-methyl-2-buten-1-al-diprenylacetal and rearrangement of obtained intermediates cis/trans-prenyl-(methyl-butadienyl)-ether (IV) and 2,4,4-trimethyl-3-formyl-1,5-hexadiene (V). (IV) and (V) are continuously distilled off and converted into (I) before or after removal of by-product prenol. Preparation of 3,7-dimethyl-2,6-octadien-1-al (citral) of formula (I) comprises: (1) thermal decomposition of 3-methyl-2-buten-1-al-diprenylacetal of formula (II) optionally in the presence of an acid catalyst to split off 3-methyl-buten-1-ol (prenol) of formula (III) and form cis/trans-prenyl-(methyl-butadienyl)-ether of formula (IV); (2) Claisen rearrangement of (IV) to give 2,4,4-trimethyl-3-formyl-1,5-hexadiene of formula (V); and (3) Cope rearrangement of (V) to form (I). The transitionally formed (IV) and (V) and the desired citral as well as the prenol (III) are continuously distilled out of the reaction mixture and (IV) and (V), before or after distillative separation of (III) and optional by-products, are subjected to rearrangement to form (I) at 100-200 degrees C.

公开(公告)号：DK0941979T3

公开(公告)日：2002-07-01

申请号：DK99104411

申请日：1999-03-05

Applicant: BASF AG

Inventor： KIEFER MATTHIAS DR ,  SIEGEL WOLFGANG DR ,  THERRE JOERG DR ,  PAHL MELANIE ,  AQUILA WERNER DR ,  SCHAEFER-LUEDERSSEN ULRICH DR

IPC: C07C29/56 ,  C07C29/80 ,  C07C33/02 ,  C07C33/03

Abstract: Continuous production of dimethyl vinyl carbinol (DMVC) comprises reaction of prenol with an aqueous solution of a protonic acid in the bottom or upper part of a rectification column while distilling off the DMVC as an azeotropic mixture with water under specified conditions. Continuous production of dimethyl vinyl carbinol (DMVC) by reaction of prenol with an aqueous solution of a protonic acid in the bottom or upper part of a rectification column while distilling off the DMVC as an azeotropic mixture with water is performed in such a way that (a) the amount of liquid two-phase mixture formed during the reaction is minimized, (b) the DMVC is distilled off with a reflux ratio of at least 2, and (c) the reaction volume (V in ml) and/or the amount of prenol added per hour (P in ml/hour) and/or the proton concentration in the reaction mixture (C in moles/liter) is such that VC/P = 0.001-1 h.mol/l.

公开(公告)号：AT218525T

公开(公告)日：2002-06-15

申请号：AT99104411

申请日：1999-03-05

Applicant: BASF AG

Inventor： KIEFER MATTHIAS DR ,  SIEGEL WOLFGANG DR ,  THERRE JOERG DR ,  PAHL MELANIE ,  AQUILA WERNER DR ,  SCHAEFER-LUEDERSSEN ULRICH DR

IPC: C07C29/56 ,  C07C29/80 ,  C07C33/02 ,  C07C33/03

Abstract: Continuous production of dimethyl vinyl carbinol (DMVC) comprises reaction of prenol with an aqueous solution of a protonic acid in the bottom or upper part of a rectification column while distilling off the DMVC as an azeotropic mixture with water under specified conditions. Continuous production of dimethyl vinyl carbinol (DMVC) by reaction of prenol with an aqueous solution of a protonic acid in the bottom or upper part of a rectification column while distilling off the DMVC as an azeotropic mixture with water is performed in such a way that (a) the amount of liquid two-phase mixture formed during the reaction is minimized, (b) the DMVC is distilled off with a reflux ratio of at least 2, and (c) the reaction volume (V in ml) and/or the amount of prenol added per hour (P in ml/hour) and/or the proton concentration in the reaction mixture (C in moles/liter) is such that VC/P = 0.001-1 h.mol/l.

公开(公告)号：DE19707385A1

公开(公告)日：1998-08-27

申请号：DE19707385

申请日：1997-02-25

Applicant: BASF AG

Inventor： KIEFER MATTHIAS DR ,  SIEGEL WOLFGANG DR ,  THERRE JOERG DR ,  PAHL MELANIE ,  AQUILA WERNER DR ,  SCHAEFER-LUEDERSSEN ULRICH DR ,  RHEUDE UDO DR

IPC: C07C29/56 ,  C07C33/03

Abstract: In the isomerisation of educt allyl alcohols (I) to product allyl alcohols (II) in aqueous solution in the presence of protonic acid (III), the pH of the reaction mixture is adjusted to 2-5 with (III) in a concentration 0.16 mole/l reaction mixture or a buffer containing (III).

公开(公告)号：DE4320820A1

公开(公告)日：1995-01-05

申请号：DE4320820

申请日：1993-06-23

Applicant: BASF AG

Inventor： THERRE JOERG DR ,  SCHWARZ HANS VOLKMAR DR ,  AGAR DAVID DR

IPC: C07C67/14 ,  C07C67/48 ,  C07C269/08

Abstract: The invention relates to a process for reacting corresponding chloroalkyl carboxylates and/or carboxylic dichlorides, dissolved in dialkyl carboxylates, with the corresponding alkanol at temperatures from 60 to 300 DEG C, the hydrogen chloride formed remaining in the reaction mixture.