Patents by Inventor Anton Hungerbuhler

Anton Hungerbuhler 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).

  • Process for producing 2-halo-4-bromophenols
    Patent number: 4210766
    Abstract: A process for the production of 2-halo-4-bromophenols of the formula ##STR1## in which X represents chlorine or bromine, is disclosed, which process comprises reacting a brominating agent with a 2-halophenol in the presence of a mixed catalyst consisting of a halide of zinc, iron, aluminium or cobalt, and a diphenyl sulfide of the formula ##STR2## in which R represents methyl or halogen, and n represents 0 to 3. The new process substantially avoids the formation of undesired 2,6-isomers and the 2-halo-4-bromophenols of the above formula are obtained in excellent yield and purity.
    Type: Grant
    Filed: August 22, 1978
    Date of Patent: July 1, 1980
    Assignee: Ciba-Geigy Corporation
    Inventors: Tibor Somlo, Anton Hungerbuhler