公开(公告)号：ES2078279T3

公开(公告)日：1995-12-16

申请号：ES90116033

申请日：1990-08-22

Applicant: BASF AG

Inventor： KOBER REINER DR ,  SEELE RAINER DR ,  ZIERKE THOMAS DR ,  ISAK HEINZ DR ,  KARBACH STEFAN DR ,  WEGNER GUNTER DR

IPC: C07B49/00 ,  C07F3/02 ,  C07F7/08

Abstract: Preparation of ether solutions of arylmethylmagnesium halides… Ar-CH2-Mg-Hal I… (Aryl = unsubstituted or substituted aryl; Hal = Cl, Br) by the Grignard process from arylmethyl halides II… Ar-CH2-Hal II… with magnesium in an ether as a solvent, by using III… tert-butyl-O-R III… (R = C1-C3-alkyl) for this purpose.

公开(公告)号：ES2192006T3

公开(公告)日：2003-09-16

申请号：ES99118458

申请日：1999-09-17

Applicant: BASF AG

Inventor： THERRE JORG DR ,  KAIBEL GERD DR ,  AQUILA WERNER DR ,  WEGNER GUNTER DR ,  FUCHS HARTWIG

IPC: C07B61/00 ,  C07C41/28 ,  B01J27/16 ,  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：ES2210073T3

公开(公告)日：2004-07-01

申请号：ES01120387

申请日：2001-08-25

Applicant: BASF AG

Inventor： THERRE JIRG DR ,  KAIBEL GERD DR ,  AQUILA WERNER DR ,  WEGNER GUNTER 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：ES2186267T3

公开(公告)日：2003-05-01

申请号：ES99105126

申请日：1999-03-26

Applicant: BASF AG

Inventor： BROCKER FRANZ JOSEF DR ,  KAIBEL GERD DR ,  AQUILA WERNER DR ,  FUCHS HARTWIG ,  WEGNER GUNTER DR ,  STROEZEL MANFRED

IPC: B01J23/44 ,  B01J8/20 ,  B01J8/22 ,  B01J19/24 ,  B01J23/46 ,  C07B61/00 ,  C07C45/62 ,  C07C47/21 ,  C07C49/04

Abstract: Production of saturated carbonyl compounds (I) by selective liquid-phase hydrogenation of alpha , beta -unsaturated carbonyl compounds (II) is carried out in a packed bubble column with the product recycled and by circulating hydrogen gas. Production of saturated carbonyl compounds of formula R1-CH(R2)-CH(R3)-C(R4)=O (I) by selective liquid-phase hydrogenation of alpha , beta -unsaturated carbonyl compounds of formula R1-C(R2)=C(R3)-C(R4)=O (II) in the presence of a particulate palladium and/or rhodium catalyst and a base is carried out in a packed bubble column with the product recycled and by circulating hydrogen gas. R1 = H or an organic group; R2-R4 = H or 1-4C alkyl.