Patents by Inventor Alain Nonn

Alain Nonn 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).

  • Process for bromination of biphenyl with BRCL
    Patent number: 5107044
    Abstract: A process for the bromination of biphenyl, particularly for the preparation of 4-bromobiphenyl or of 4,4'-dibromobiphenyl. The process comprises reacting biphenyl with BrCl. The BrCl may be formed in situ in the reaction medium or may be formed before reaction with biphenyl.
    Type: Grant
    Filed: September 20, 1990
    Date of Patent: April 21, 1992
    Assignee: Rhone-Poulenc Chimie
    Inventor: Alain Nonn
  • Process for the purification of dihydroxybiphenyls
    Patent number: 5087768
    Abstract: A process for the purification of dihydroxybiphenyls, preferably 4,4'-dihydroxybiphenyl, by acylation of the preparation medium of the dihydroxybiphenyl and selective precipitation of the biphenyl diester (diacetylbiphenyl), followed by conversion of the biphenyl diester to dihydroxybiphenyl.
    Type: Grant
    Filed: October 1, 1990
    Date of Patent: February 11, 1992
    Assignee: Rhone-Poulenc Chimie
    Inventor: Alain Nonn
  • Preparation of 4,4'-dibromobiphenyl
    Patent number: 5015792
    Abstract: 4,4'-Dibromobiphenyl is selectively produced in high yields by actively brominating biphenyl in a reaction medium containing at least one strong acid having a pKa of at most 4, e.g., a carboxylic or sulfonic acid, and, optionally, a reaction solvent.
    Type: Grant
    Filed: April 24, 1989
    Date of Patent: May 14, 1991
    Assignee: Rhone-Poulenc Chimie
    Inventor: Alain Nonn
  • Preparation of 4-bromobiphenyl
    Patent number: 4990705
    Abstract: 4-Bromobiphenyl is selectively produced in high yields, and in high conversions, by monobrominating biphenyl in a solvent reaction medium containing at least one organosulfur compound, amide, nitrile or acid having a pKa of at least 3.
    Type: Grant
    Filed: April 24, 1989
    Date of Patent: February 5, 1991
    Assignee: Rhone-Poulenc Chimie
    Inventor: Alain Nonn
  • Process for the preparation of 4,4'-dibromobiphenyl in a solvent medium and with a catalyst
    Patent number: 4983781
    Abstract: The preparation of 4,4'-dibromobiphenyl. A biphenyl is reacted with bromine in a solvent in the presence of a catalytic system based on at least one component selected from the group consisting of Lewis acids and iodine.
    Type: Grant
    Filed: February 23, 1989
    Date of Patent: January 8, 1991
    Assignee: Rhone-Poulenc Chimie
    Inventors: Jean-Roger Desmurs, Alain Nonn
  • Process for the preparation of hydroxybiphenyls
    Patent number: 4891452
    Abstract: A process for preparing hydroxybiphenyls. A bromobiphenyl is contacted with a base in aqueous liquid phase at a temperature less than or equal to 230.degree. C. in the presence of a copper-based catalyst. The hydroxyl ion concentration of base ranges from 0.1 to about 1.6 molar equivalents per liter. At temperatures less than 215.degree. C., a cocatalyst is preferably added.
    Type: Grant
    Filed: February 10, 1988
    Date of Patent: January 2, 1990
    Assignee: Rhone-Poulenc Chimie
    Inventors: Alain Nonn, Jean R. Desmurs
  • Process for the preparation of hydroxybiphenyls
    Patent number: 4853487
    Abstract: A process for the production of a hydroxybiphenyl by the hydrolysis of a bromobiphenyl, at a temperature below 300.degree. C., in the presence of both a copper-based catalyst and a separate cocatalyst selected from amongst halides, phosphates, nitrates, alcoholates, silicates, alcohols, carboxylic acids, sulfonic acids, organic sulfur-containing compounds, carbon monoxide, quinolines, tertiary amines, ammoniums, phosphines, phosphoniums, cyanides and palladium.
    Type: Grant
    Filed: January 20, 1988
    Date of Patent: August 1, 1989
    Assignee: Rhone-Poulenc Chimie
    Inventor: Alain Nonn