Patents Prof. Dr. Günter Helmchen

 
G. Helmchen, U. Kazmaier, W. Schäfer, S. Schleich, H. Stahr, V. Wolfart
Preparation of 3,4-dehydroprolines and -piperidines.
Ger. Offen. (2000), 4 pp. CODEN: GWXXBX DE 19913699 A1 20000928 AN 2000:686117 CAPLUS
 
 
Helmchen, Gunther; Murmann, Christoph.
Preparation of optically active diphosphine ligands as asymmetric hydrogenation cocatalyst.
Eur. Pat. Appl. 11 pp. CODEN: EPXXDW EP 885897 A1 981223 CAN 130:66620; AN 1999:12425
 
 
Helmchen, Guenter; Langer, Thomas.
Ruthenium complexes with chiral bidentate phosphinoxazoline ligands for the enantioselective transfer hydrogenation of prochiral ketones.
Eur. Pat. Appl. 9 pp. CODEN: EPXXDW EP 780157 A1 970625 CAN 127:110583; AN 1997:491568.
 
 
Ritter, Kurt; Adam, Geo; Helmchen, Guenter; Sprinz, Juergen.
Preparation of iminoheterocycle-containing ligands.
Ger. Offen. 10 pp. CODEN: GWXXBX DE 4243030 A1 940623 CAN 122:31703; AN 1995:25966.
 
 
Helmchen, Guenter; Poll, Thomas; Hartmann, Horst; Karge, Reinhard.
Preparation of optically active diesters of fumaric acid.
Ger. Offen. 5 pp. CODEN: GWXXBX DE 3702084 A1 870924 CAN 108:111830; AN 1988:111830.
 
 
Helmchen, Guenter; Poll, Thomas.
(R)- and (S)-2-(Alkenoyloxy)alkanoic acid esters and their use as dienophilic components for asymmetric Diels-Alder reactions.
Ger. Offen. 42 pp. CODEN: GWXXBX DE 3409441 A1 850919 CAN 105:42492; AN 1986:442492.
 
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