Chalcogen Attached Directly To The Nitrogen Of The Imidic Halide Group By Nonionic Bonding (i.e., -x-n=ch-halo, Wherein X Is Chalcogen) Patents (Class 562/804)
  • Process for making 2-aryl benz (ox, thi, imid) azoles and 2-aminoaryl aminobenz (ox, thi, imid) azoles
    Patent number: 6222044
    Abstract: 2-(aryl)-benz(ox, thi, imid)azoles are prepared by reacting an aromatic aldehyde with hydroxylamine to form an aromatic aldehyde oxime, halogenating the oxime to form an aromatic hydroxamoyl halide, and then reacting this halide with certain aromatic amine compounds. The products may be nitrated and then reduced to form the corresponding diamines, which are useful in making PIBX polymers.
    Type: Grant
    Filed: June 10, 1996
    Date of Patent: April 24, 2001
    Assignee: The Dow Chemical Company
    Inventor: Zenon Lysenko
  • Process for making 2-aryl benz (ox, thi, imid)azoles and 2-aminoaryl aminobenz(ox, thi, imid)azoles
    Patent number: 5567843
    Abstract: 2-(aryl)-benz(ox, thi, imid)azoles are prepared by reacting an aromatic aldehyde with hydroxylamine to form an aromatic aldehyde oxime, halogenating the oxime to form an aromatic hydroxamoyl halide, and then reacting this halide with certain aromatic amine compounds. The products may be nitrated and then reduced to form the corresponding diamines, which are useful in making PIBX polymers.
    Type: Grant
    Filed: March 20, 1995
    Date of Patent: October 22, 1996
    Assignee: The Dow Chemical Company
    Inventor: Zenon Lysenko
  • Process for preparing .alpha.-chloro-.alpha.-oximino-4-hydroxyacetophenone
    Patent number: 5292945
    Abstract: A process for the preparation of .alpha.-chloro-.alpha.-oximino-4-hydroxyacetophenone by reacting nitrosyl chloride with a mixture of 4-hydroxyacetophenone and a strong acid catalyst such as hydrogen chloride is disclosed. The nitrosyl chloride is introduced as a gas into the reactor to contact 4-hydroxyacetophenone and said acid catalyst dissolved in a solvent therein.
    Type: Grant
    Filed: February 16, 1993
    Date of Patent: March 8, 1994
    Assignee: Hoechst Celanese Corporation
    Inventors: John R. Durrwachter, Charlet R. Lindley, Graham N. Mott