Patents by Inventor Grety Rihs

Grety Rihs 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).

  • Metallically conducting (2-fluoro-5,6,11,12-tetraselenotetracene).sub.2 -bromide
    Patent number: 4522754
    Abstract: The novel complex of the formula I ##STR1## can be produced for example by electrochemical oxidation of 2-fluoro-5,6,11,12-tetraselenotetracene in the presence of an inert organic solvent and a bromide-containing electrolyte. The novel 2-fluoro-5,6,11,12-tetraselenotetracene can for its part be produced by reacting 2,3-naphthalenedicarboxylic anhydride, in the presence of a Friedel-Crafts catalyst, with fluorobenzene to 2-(4-fluorobenzoyl)-naphthalene-3-carboxylic acid; cyclizing this to 2-fluoro-5,12-naphthacenequinone; reducing the 2-fluoro-5,12-naphthacenequinone to 2-fluorotetracene; reacting the 2-fluorotetracene with sulfuryl chloride to 2-fluoro-5,11- or 2-fluoro-6,12-dichlorotetracene; and finally reacting the last-mentioned at elevated temperature with selenium to obtain 2-fluoro-5,6,11,12-tetraselenotetracene. The complex of the formula I is metallically conducting, and is distinguished by a stable metallic phase down to at least 5.degree. K.
    Type: Grant
    Filed: November 2, 1983
    Date of Patent: June 11, 1985
    Assignee: Ciba Geigy Corporation
    Inventors: Bruno Hilti, Carl W. Mayer, Grety Rihs