Patents by Inventor Heinz Dralle

Heinz Dralle 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 veratryl cyanide
    Patent number: 4661610
    Abstract: Veratryl cyanide is prepared by chloromethylating veratrol in solution in toluene and then reacting the resulting veratryl chloride with from 1 to 5 moles of an alkali metal cyanide, by a process in which the toluene from the chloromethylation is not removed for the reaction with cyanide, and from 3 to 25% by weight, based on veratryl chloride, of water, from 5 to 50% by weight, based on toluene, of a ketone of 3 to 6 carbon atoms and from 0.1 to 10% by weight, based on veratryl chloride, of a phase transfer catalyst are added before the reaction with cyanide.
    Type: Grant
    Filed: July 22, 1986
    Date of Patent: April 28, 1987
    Assignee: BASF Aktiengesellschaft
    Inventors: Josef Muller, Walter-Wielant Wiersdorff, Wolfram Burst, Heinz Dralle, Ernst Schaffner, Rolf Steinkamp