Patents by Inventor Thaliyil V. Rajanbabu

Thaliyil V. Rajanbabu 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).

  • Enantioselective hydroformylation
    Patent number: 5574171
    Abstract: Enantioselective hydroformylation of vinyl compounds using a catalyst composition of a chiral carbohydrate phosphorous ligand with a Rh, Pt, Co or Ir metal, to produce chiral 2-substituted propanals, wherein the phosphorous of the ligand is substituted with electron withdrawing groups.
    Type: Grant
    Filed: April 24, 1995
    Date of Patent: November 12, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Timothy A. Ayers, Thaliyil V. Rajanbabu
  • 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
  • Selective asymmetric hydrogenation of dehydroamino acid derivatives using rhodium and iridium diphosphinite carbohydrate catalyst compositions
    Patent number: 5510507
    Abstract: A process and catalyst composition are provided for the highly efficient enantioselective hydrogenation of dehydroamino acid derivatives. The catalyst composition comprises rhodium or iridium and a diphosphinite carbohydrate ligand, wherein the phosphorous atoms are attached to aromatic groups substituted with electron-donating substituents. Also provided is a means to selectively produce .alpha. amino acids in either the L or the D form, based upon use of a sugar in the ligand with phosphinites attached in an absolute Right-Left or Left-Right configuration, respectively.
    Type: Grant
    Filed: April 24, 1995
    Date of Patent: April 23, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Timothy A. Ayers, 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
  • Selective asymmetric hydrogenation of dehydroamino acid derivatives using rhodium and iridium diphosphinite carbohydrate catalyst compositions
    Patent number: 5481006
    Abstract: A process and catalyst composition are provided for the highly efficient enantioselective hydrogenation of dehydroamino acid derivatives. The catalyst composition comprises rhodium or iridium and a diphosphinite carbohydrate ligand, wherein the phosphorous atoms are attached to aromatic groups substituted with electron-donating substituents. Also provided is a means to selectively produce .alpha. amino acids in either the L or the D form, based upon use of a sugar in the ligand with phosphinites attached in an absolute Right-Left or Left-Right configuration, respectively.
    Type: Grant
    Filed: January 11, 1994
    Date of Patent: January 2, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Timothy A. Ayers, Thaliyil V. Rajanbabu
  • Enantioselective hydroformylation
    Patent number: 5475146
    Abstract: Enantioselective hydroformylation of vinyl compounds using a catalyst composition of a chiral carbohydrate phosphorous ligand with a Rh, Pt, Co or Ir metal, to produce chiral 2-substituted propanals, wherein the phosphorous of the ligand is substituted with electron withdrawing groups.
    Type: Grant
    Filed: September 2, 1993
    Date of Patent: December 12, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Timothy A. Ayers, Thaliyil V. Rajanbabu
  • 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.
  • Nitroaryl carbonyl compounds, nitrodihydroaryl carbonyl intermediates thereto, and processes
    Patent number: 5164499
    Abstract: Nitroaryl carbonyl Formula (IIA) compounds, their nitrodihydroaryl carbonyl Formula (I) intermediates, processes for preparing Formula (II) compounds, and a process for preparing Formula (I) compounds, wherein each process comprises the reaction of a nitroaryl compound with a silane.
    Type: Grant
    Filed: January 2, 1990
    Date of Patent: November 17, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Thaliyil V. Rajanbabu
  • Process for preparation of alkoxycarbonyloxystyrene
    Patent number: 5082965
    Abstract: The present invention provides a process for the preparation of alkoxycarbonyloxystyrene comprising reacting acyloxystyrene with a strong base to yield a phenolate to which is added an alkoxycarbonylating agent in an organic solvent and a phase transfer catalyst to yield the desired product in the organic phase.
    Type: Grant
    Filed: October 29, 1990
    Date of Patent: January 21, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Allan E. Nader, Thaliyil V. Rajanbabu
  • Processes for making nitroaryl carbonyl compounds and nitrodihydroaryl carbonyl intermediates thereto
    Patent number: 4912220
    Abstract: Nitroaryl carbonyl Formula (IIA) compounds, their nitrodihydroaryl carbonyl Formula (I) intermediates, processes for preparing Formula (II) compounds, and a process for preparing Formula (I) compounds, wherein each process comprises the reaction of a nitroaryl compound with a silane.
    Type: Grant
    Filed: February 3, 1988
    Date of Patent: March 27, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Thaliyil V. Rajanbabu
  • Nitroaryl carbonyl compounds, nitrodihydroaryl carbonyl intermediates thereto, and processes
    Patent number: 4743690
    Abstract: Nitroaryl carbonyl Formula (IIA) compounds, their nitrodihydroaryl carbonyl Formula (I) intermediates, processes for preparing Formula (II) compounds, and a process for preparing Formula (I) compounds, wherein each process comprises the reaction of a nitroaryl compound with a silane.
    Type: Grant
    Filed: January 16, 1987
    Date of Patent: May 10, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Thaliyil V. Rajanbabu
  • Process of preparing nitrodihydroaryl carbonyl compounds
    Patent number: 4659862
    Abstract: Nitroaryl carbonyl Formula (IIA) compounds, their nitrodihydroaryl carbonyl Formula (I) intermediates, processes for preparing Formula (II) compounds, and a process for preparing Formula (I) compounds, wherein each process comprises the reaction of a nitroaryl compound with a silane.
    Type: Grant
    Filed: May 3, 1984
    Date of Patent: April 21, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Thaliyil V. Rajanbabu