公开(公告)号：DE3466678D1

公开(公告)日：1987-11-12

申请号：DE3466678

申请日：1984-11-15

Applicant: DEGUSSA

Inventor： ANDRADE JUAN DR DIPL CHEM ,  PRESCHER GUNTER DR DIPL CHEM ,  SAMSON MARC DR DIPL CHEM

IPC: C07C45/42 ,  B01J31/00 ,  B01J31/24 ,  C07B61/00 ,  C07C41/56 ,  C07C45/00 ,  C07C45/49 ,  C07C45/50 ,  C07C45/51 ,  C07C47/12 ,  C07C47/198 ,  C07C67/00

Abstract: The preparation of 1,4-butandial (succindialdehyde) is obtained using acrolein. The acrolein is first converted with an alkanol into 3,3-dialkoxy-1-propene and this is then hydroformylated in the presence of hydridotristriphenylphosphine-rhodiumcarbonyl mixed with triphenylphosphine or triphenylphosphite as the catalyst. The thereby obtained 4,4-dialkoxy-butanal is removed from the hydroformylation product by means of distillation and is then hydrolyzed to 1,4-butandial.

公开(公告)号：DE3572980D1

公开(公告)日：1989-10-19

申请号：DE3572980

申请日：1985-10-25

Applicant: DEGUSSA

Inventor： ANDRADE JUAN DR DIPL CHEM ,  PRESCHER GUNTER DR DIPL CHEM ,  NAGEL ULRICH DR DIPL CHEM

IPC: B01J31/18 ,  C07D207/12 ,  C07D207/40 ,  C07D207/416 ,  C07F9/572 ,  C07F9/65

Abstract: Optically active 1-benzyl-3,4-bis-(diphenylphosphino)-pyrrolidine is produced in a three-step process from optically active 1-benzyl-2,5-dioxo-3,4-dihydroxy-pyrrolidine. The product is useful as a chiral ligand in rhodium complexes which serve as catalysts for the homogeneous asymmetric hydrogenation of prochiral substrates.

公开(公告)号：DE3565396D1

公开(公告)日：1988-11-10

申请号：DE3565396

申请日：1985-12-17

Applicant: DEGUSSA

Inventor： ANDRADE JUAN DR DIPL CHEM ,  PRESCHER GUNTER DR DIPL CHEM ,  SAMSON MARC DR DIPL CHEM

IPC: C07C47/12 ,  B01J31/00 ,  B01J31/24 ,  C07B61/00 ,  C07C45/00 ,  C07C45/42 ,  C07C45/49 ,  C07C45/50 ,  C07C45/51 ,  C07C67/00

公开(公告)号：DE3482108D1

公开(公告)日：1990-06-07

申请号：DE3482108

申请日：1984-11-07

Applicant: DEGUSSA

Inventor： ANDRADE JUAN DR DIPL CHEM ,  ARNTZ DIETRICH DR DIPL CHEM ,  KRAFT MICHAEL ,  PRESCHER GUENTER DR DIPL CHEM

IPC: C07C41/50 ,  B01J21/00 ,  B01J29/00 ,  B01J31/00 ,  C07B61/00 ,  C07C41/00 ,  C07C41/56 ,  C07C41/58 ,  C07C43/303 ,  C07C67/00

Abstract: A method of preparation for acetals utilizing saturated or unsaturated aldehydes, in particular, the preparation of dimethylacetals of acetaldehyde, acrolein and methacrolein. The production of the acetal takes place in a liquid phase in the presence of a solid acid catalyst, such as a strongly acidic ion exchange resin or zeolite. The conversion mixture is extracted by means of water and by means of water insoluble organic solvents. There is obtained not only the desired acetals, but in addition also the unconverted initial quantities of the starting materials by a simple method and with very good yields.

公开(公告)号：DE3663142D1

公开(公告)日：1989-06-08

申请号：DE3663142

申请日：1986-10-10

Applicant: DEGUSSA

Inventor： ANDRADE JUAN DR DIPL CHEM ,  PRESCHER GUNTER DR DIPL CHEM

IPC: C07D307/20