Patents Represented by Attorney R. H. Hammer

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  • Method of preparing 7,8-difluoro-2,3-dihydro-3-methyl-4H-1, 4-benzoxazine
    Patent number: 5644056
    Abstract: A method of preparing 7,8-difluoro-2,3-dihydro-3-methyl-4H-1,4 benzoxazine. The method includes the steps of reacting 2,3,4-trifluoroaniline or trifluoronitrobenzene with hydroxyacetone or a derivative thereof under reducing conditions to yield N-(3-hydroxy-2-propyl)-2,3,4 trifluoroaniline. The N-(3-hydroxy-2-propyl)-2,3,4-trifluoroaniline is treated with a base to yield the above-mentioned benzoxazine.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: July 1, 1997
    Assignee: Hoechst Celanese Corporation
    Inventor: John C. Saukaitis