Patents by Inventor Helmut Goerth

Helmut Goerth 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).

  • Preparation of 1-alkyl-2-chloro-5-nitrobenzene-4-sulfonic acids
    Patent number: 4427600
    Abstract: A process for the preparation of compounds of the formula I ##STR1## where R is alkyl, by sulfonation, chlorination and nitration starting from an alkylbenzene, wherein the alkylbenzene is sulfonated with from 2.5 to 3, preferably from 2.65 to 2.75, moles of concentrated sulfuric acid per mole of alkylbenzene, the reaction product is then reacted with from about 1.1 to 1.3 moles of chlorine in the absence of a catalyst, the product is subsequently nitrated with highly concentrated nitric acid at elevated temperatures and the nitro compound is isolated.
    Type: Grant
    Filed: January 29, 1982
    Date of Patent: January 24, 1984
    Assignee: BASF Aktiengesellschaft
    Inventors: Peter Tonne, Elisabeth R. Mueller, Helmut Goerth