Patents Represented by Attorney Rich Roberts

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  • Process for the production of 3,5-disubstituted-4-acetoxystyrene
    Patent number: 5072025
    Abstract: 3-substituted-4-hydroxy- and 4-acetoxystyrene compounds, especially 3,5-di(methyl, bromo or chloro)-4-acetoxystyrene as well as a process for its preparation. 2,6-dimethylphenol is acylated with acetic anhydride and HF catalyzed to produce 3,5-dimethyl-4-hydroxy-acetophenone. After subsequent esterification with acetic anhydride and catalyzed hydrogenation to form 1-(3',5'-dimethyl-4'-acetoxyphenyl)ethanol, this intermediate is then dehydrated with an acid and a polymerization inhibitor to produce 3,5-dimethyl-4-acetoxystyrene.
    Type: Grant
    Filed: July 26, 1990
    Date of Patent: December 10, 1991
    Assignee: Hoechst Celanese Corporation
    Inventors: Richard Vicari, Mohammad Aslam, Wilson B. Ray, Kenneth G. Davenport, Ralph Dammel, Juergen Lingnau, Karl-Friedrich Doessel