Patents by Inventor Albert L. Casalnuovo

Albert L. Casalnuovo 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).

  • Chiral, bidentate organophosphorus ligand
    Patent number: 5510470
    Abstract: A chiral, bidentate organophosphorus ligand containing a dideoxysaccharide used along with zero valent nickel as a catalyst for enantioselective hydrocyanation. The preferred organophosphorus ligand species is phenyl 2,3-bis-O-(3,5-bis(trifluoromethyl)phenyl)phosphine-4,6-O-benzylidene-B-D- glucopyranoside.
    Type: Grant
    Filed: April 19, 1995
    Date of Patent: April 23, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Albert L. Casalnuovo, Thaliyil V. Rajanbabu
  • Organophosphorus saccharide nickel catalyst
    Patent number: 5484902
    Abstract: A composition for the enantioselective hydrocyanation of aromatic vinyl compounds comprising zero valent nickel and a chiral, nonracemic, bidentate organophosphorus ligand. The preferred organophosphorus ligand species is phenyl 2,3-bis-O-(3,5-bis(tri-fluoromethyl)phenyl)phosphino-4,6,0-benzilidene-B-D -glucopy-anoside as shown below.
    Type: Grant
    Filed: February 25, 1994
    Date of Patent: January 16, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Albert L. Casalnuovo, Thaliyil V. Rajanbabu
  • Preparation of triarylborane
    Patent number: 5382697
    Abstract: Preparation of triarylborane from catalyst residues containing nickel complexes with triarylborane by heating the complexes at reduced pressure, and recovering the triarylborane by condensation.
    Type: Grant
    Filed: June 23, 1994
    Date of Patent: January 17, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Albert L. Casalnuovo, Thomas Foo
  • Enantioselective hydrocyanation of aromatic vinyl compounds
    Patent number: 5312957
    Abstract: The invention provides a process for enantioselective hydrocyanation of aromatic vinyl compounds which produces nonracemic mixtures of chiral, arylpropionitriles; novel carbohydrate phosphorus and nickel catalyst compositions; and optically pure (S)-(-)-2-(6-methoxy-2-naphthalene)propionitrile.
    Type: Grant
    Filed: October 15, 1992
    Date of Patent: May 17, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Albert L. Casalnuovo, Thaliyil V. Rajanbabu, Lawrence W. Gosser, Ronald J. McKinney, Nugent, Jr. William A.
  • Enantioselective hydrocyanation of aromatic vinyl compounds
    Patent number: 5175335
    Abstract: The invention provides a process for enantioselective hydrocyanation of aromatic vinyl compounds which produces nonracemic mixtures of chiral, arylpropionitriles; novel carbohydrate phosphorus and nickel catalyst compositions; and optically pure (S)-(-)-2-(6-metehoxy-2-naphthalene)propionitrile.
    Type: Grant
    Filed: November 12, 1991
    Date of Patent: December 29, 1992
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Albert L. Casalnuovo, Thaliyil V. Rajanbabu, Lawrence W. Gosser, Ronald J. McKinney, William A. Nugent, Jr.
  • Process for activation or regeneration of nickel catalyst
    Patent number: 5143873
    Abstract: This invention concerns the use of M[BR.sub.3 H].sub.y reagents for activating or regenerating deactivated or degraded Ni catalyst used in Ni-catalyzed alkene hydrocyanation processes in the presence of an organic phosphorus compound, where M is an electropositive ion excluding nickel, such as, but not limited to, the Group 1A cations, the Group IIA cations, the lanthanide cations and the quaternary ammoniums and R is an organic radical of up to 18 carbon atoms, and where y is equal to the net charge of the cation. The invention also concerns a process for activation or regeneration of Ni-catalysts using MH and a catalytic amount of BR.sub.3.
    Type: Grant
    Filed: December 17, 1990
    Date of Patent: September 1, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Henry E. Bryndza, Albert L. Casalnuovo
  • Aqueous alkylation process
    Patent number: 5043510
    Abstract: This invention relates to a process for alkylation at carbon and phosphorus sites in an aqueous medium using precious metal catalysts containing sulfonated triarylphosphines (STP) of the generic formula P(C.sub.6 H.sub.4 SO.sub.3 --)X(C.sub.6 H.sub.5)Y (X+Y=3).
    Type: Grant
    Filed: March 27, 1989
    Date of Patent: August 27, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Albert L. Casalnuovo, William A. Nugent, Jr.