Patents by Inventor Alain Roustan

Alain Roustan 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).

  • Noncatalyzed synthesis of 4-hydroxyquinolines and/or tautomers thereof
    Patent number: 6465653
    Abstract: The 4-hydroxyquinoline compounds and/or tautomers thereof, notably 4-hydroxy-5,7-dichchloroquinoline, are synthesized in very high yields by hydrolyzing/decarboxylating a 4-hydroxyquinolinecarboxylic acid ester in the presence of water, whether in liquid or vapor state, but in the absence of any catalyst for such reaction(s).
    Type: Grant
    Filed: March 23, 2001
    Date of Patent: October 15, 2002
    Assignee: Rhodia Chimie
    Inventors: Taun-Phat Dang, Alain Roustan
  • Noncatalyzed synthesis of 4-hydroxyquinolines and/or tautomers thereof
    Publication number: 20020007067
    Abstract: The 4-hydroxyquinoline compounds and/or tautomers thereof, notably 4-hydroxy-5,7-dichchloroquinoline, are synthesized in very high yields by hydrolyzing/decarboxylating a 4-hydroxyquinolinecarboxylic acid ester in the presence of water, whether in liquid or vapor state, but in the absence of any catalyst for such reaction(s).
    Type: Application
    Filed: March 23, 2001
    Publication date: January 17, 2002
    Inventors: Tuan-Phat Dang, Alain Roustan
  • Use of an aniline depleted in electron to release hydrochloric acid present in a reaction mixture and method for displacing, at least partially, an aniline from its chlorhydrate
    Patent number: 6225502
    Abstract: The invention concerns a method for displacing, at least partially, an aniline from its chlorhydrate, characterized in that said aniline is selected among anilines whereof the conjugate acid has a pKa not more than 6 and in that it consists in a step wherein it is subjected at a temperature not less than 50° C., advantageously about 70° C. to a reaction medium containing said chlorhydrate at least partially dissolved in a weakly polar solvent. The invention is applicable to organic synthesis.
    Type: Grant
    Filed: December 9, 1999
    Date of Patent: May 1, 2001
    Assignee: Rhodia Chimie
    Inventors: Alain Roustan, Philippe-Jean Tirel
  • Preparation of fluorobenzonitriles
    Patent number: 4351777
    Abstract: Fluorobenzonitriles are prepared by reacting their corresponding chlorobenzonitriles with at least one alkali metal fluoride, in an aprotic solvent reaction medium, in the presence of at least one tertiary amine sequestering agent having the structural formula:N--CHR.sub.1 --CHR.sub.2 --O--(CHR.sub.2 --CHR.sub.4 --O).sub.n R.sub.5 ].sub.3.
    Type: Grant
    Filed: September 22, 1981
    Date of Patent: September 28, 1982
    Assignee: Rhone-Poulenc Industries
    Inventors: R. Ramanadin, Alain Roustan, Gerard Soula