Patents Represented by Attorney Craig L. Hillemann

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  • Hydroxylation of ?-dicarbonyls with zirconium catalysts
    Patent number: 8258345
    Abstract: The present invention pertains to a process for preparing a compound of Formula I that is achiral, racemic or enantiomerically enriched at the hydroxylation center indicated by * comprising contacting a compound of Formula II with an oxidant selected from oxygen, hydrogen peroxide, peracids or alkyl hydroperoxides in the presence of a zirconium complex, wherein R1, R2 and R3 are as defined in the disclosure. This invention also pertains to zirconium complexes useful in this procedure comprising zirconium and a ligand of Formula III or its enantiomer wherein J, R6 and n are as defined in the disclosure. This invention further pertains to a compound of Formula III or its enantiomer.
    Type: Grant
    Filed: March 16, 2011
    Date of Patent: September 4, 2012
    Assignee: E I du Pont de Nemours and Company
    Inventor: Albert Loren Casalnuovo
  • Hydroxylation of ?-dicarbonyls with zirconium catalysts
    Patent number: 7939685
    Abstract: The present invention pertains to a process for preparing a compound of Formula I that is achiral, racemic or enantiomerically enriched at the hydroxylation center indicated by * comprising contacting a compound of Formula II with an oxidant selected from oxygen, hydrogen peroxide, peracids or alkyl hydroperoxides in the presence of a zirconium complex, wherein R1, R2 and R3 are as defined in the disclosure. This invention also pertains to zirconium complexes useful in this procedure comprising zirconium and a ligand of Formula III or its enantiomer wherein J, R6 and n are as defined in the disclosure. This invention further pertains to a compound of Formula III or its enantiomer.
    Type: Grant
    Filed: March 29, 2010
    Date of Patent: May 10, 2011
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Albert Loren Casalnuovo
  • Hydroxylation of beta-dicarbonyls with zirconium catalysts
    Patent number: 7718818
    Abstract: The present invention pertains to a process for preparing a compound of Formula I that is achiral, racemic or enantiomerically enriched at the hydroxylation center indicated by * comprising contacting a compound of Formula II with an oxidant selected from oxygen, hydrogen peroxide, peracids or alkyl hydroperoxides in the presence of a zirconium complex, wherein R1, R2 and R3 are as defined in the disclosure. This invention also pertains to zirconium complexes useful in this procedure comprising zirconium and a ligand of Formula III or its enantiomer wherein J, R6 and n are as defined in the disclosure. This invention further pertains to a compound of Formula III or its enantiomer.
    Type: Grant
    Filed: June 24, 2008
    Date of Patent: May 18, 2010
    Assignee: E.I. du Pont de Nemours and Company
    Inventor: Albert Loren Casalnuovo