Patents by Inventor Ulrich Pittelkow

Ulrich Pittelkow 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).

  • Catalytic hydrogenation of carbon-heteroatom double bonds
    Patent number: 7446236
    Abstract: Process for catalytically hydrogenating carbon-heteroatom double bonds, in particular for asymmetrically catalytically hydrogenating simple ketones, which includes the step of reacting the substrate with hydrogen in the presence of a hydrogenation catalyst and of a base, characterized in that the hydrogenation catalyst is a 5-coordinate ruthenium complex which in each case has a monophosphine ligand and a bidentate P-N ligand.
    Type: Grant
    Filed: November 27, 2003
    Date of Patent: November 4, 2008
    Assignee: Solvias AG
    Inventors: Frédéric Maurice Naud, Ulrich Pittelkow
  • Catalytic hydrogenation of carbon-heteroatom double bonds
    Publication number: 20060106247
    Abstract: Process for catalytically hydrogenating carbon-heteroatom double bonds, in particular for asymmetrically catalytically hydrogenating simple ketones, which includes the step of reacting the substrate with hydrogen in the presence of a hydrogenation catalyst and of a base, characterized in that the hydrogenation catalyst is a 5-coordinate ruthenium complex which in each case has a monophosphine ligand and a bidentate P-N ligand.
    Type: Application
    Filed: November 27, 2003
    Publication date: May 18, 2006
    Inventors: Frederic Naud, Ulrich Pittelkow
  • Hydrogenation catalyst, process for the preparation thereof and hydrogenation process
    Patent number: 6218559
    Abstract: Reaction products of an iridium(III) salt or a hydrate thereof, a diphosphine having secondary phosphine groups and a metal or ammonium chloride, bromide or iodide are excellent hydrogenation catalysts for ketimine. Using chiral diphosphines and prochiral ketimines, diastereoisomeric secondary amines are obtained in high optical yields.
    Type: Grant
    Filed: March 11, 1999
    Date of Patent: April 17, 2001
    Assignee: Novaritis Corporation
    Inventors: Felix Spindler, Ulrich Pittelkow
  • Hydrogenation catalyst, process for the preparation thereof and hydrogenation process
    Patent number: 5912375
    Abstract: Reaction products of an iridium (III) salt or a hydrate thereof, a diphosphine having secondary phosphine groups and a metal or ammonium chloride, bromide or iodide are excellent hydrogenation catalysts for ketimine. Using chiral diphosphines and prochiral ketimines, diastereoisomeric secondary amines are obtained in high optical yields.
    Type: Grant
    Filed: June 9, 1997
    Date of Patent: June 15, 1999
    Assignee: Novartis Corporation
    Inventors: Felix Spindler, Ulrich Pittelkow
  • Process for the preparation of optically active aliphatic hydroxycarboxylic acids
    Patent number: 5198569
    Abstract: The asymmetric hydrogenation of aliphatic .alpha.-keto esters in the presence of rhodium catalysts which contain as chiral ligand a diphosphine of formula IV(R.sub.3).sub.2 P--Q--P(R.sub.3)hd 2 (IV)wherein R.sub.3 is phenyl, C.sub.1 -C.sub.6 alkylphenyl or C.sub.1 -C.sub.6 alkoxyphenyl, and Q is [2,2,1]-bicyloheptan-1,2-ylene or [2,2,1]-bicyclohept-4,5-en-1,2-ylene, gives the corresponding (R)- or(S)-.alpha.-hydroxycarboxylic acid esters in high rates of chemical conversion and in high enantiomer excesses.
    Type: Grant
    Filed: September 11, 1991
    Date of Patent: March 30, 1993
    Assignee: Ciba-Geigy Corporation
    Inventors: Hans-Ulrich Blaser, Ulrich Pittelkow, Felix Spindler