Patents by Inventor Gudrun Voss

Gudrun Voss has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Production of optically active phospholanes
    Patent number: 6632953
    Abstract: Phospolanes and diphospholanes of the general formula I where: is H, C1-C6-aryl, alkylaryl, SiR32, R2 is alkyl or aryl, A is H, C1-C6-alkyl, aryl, Cl or B is a linker with 1-5 C atoms between the two P atoms, and their use as catalyst in asymmetric synthesis.
    Type: Grant
    Filed: November 15, 2000
    Date of Patent: October 14, 2003
    Assignee: BASF Aktiengesellschaft
    Inventors: Rainer Stürmer, Armin Börner, Jens Holz, Gudrun Voss
  • Asymmetric hydrogenation of &bgr;-keto esters
    Patent number: 6359165
    Abstract: Enantiomerically pure &bgr;-hydroxy esters are prepared by a process in which &bgr;-keto esters are reacted with hydrogen in the presence of catalysts of the formula LRuX2 where X is halogen, acetate, allyl, methallyl, 2-phenylallyl, perchlorate, trifluoroacetate, tetrafluoroborate, hexafluoroantimonate, hexafluorophosphate, hexafluoroarsenate or trichloroacetate, L is a bidentate phospholane of the formula I  where B=a bridging link with 1-5 carbon atoms between the two phosphorus atoms, R1=H, C1-C6-alkyl, aryl, alkylaryl or SiR23, R2=alkyl or aryl, m=0 or 1, R3=H or OR4, and R4=R1, with the proviso that if m=1 then R3=H and if m=0 then R3 ≠ H.
    Type: Grant
    Filed: September 29, 1999
    Date of Patent: March 19, 2002
    Assignee: BASF Aktienegesellschaft
    Inventors: Rainer Stürmer, Martin Jochen Klatt, Armin Börmer, Jens Holz, Gudrun Voss
  • Preparation of optically active phospholanes, their metal complexes and use in asymmetric synthesis
    Patent number: 6043396
    Abstract: Phospholanes and diphospholanes of the formula I ##STR1## where: R.sup.1 and R.sup.2 are, independently of one another, C.sub.1 -C.sub.6 -alkyl, aryl, alkylaryl,R.sup.1 is also hydrogen,A is either R.sup.1 or ##STR2## B is a linker having 1-5 carbon atoms between the two phosphorus atoms, and their use as catalyst in asymmetric synthesis.
    Type: Grant
    Filed: June 8, 1998
    Date of Patent: March 28, 2000
    Assignee: BASF Aktiengesellschaft
    Inventors: Rainer Sturmer, Armin Borner, Jens Holz, Gudrun Voss