Patents by Inventor Achim Noak

Achim Noak 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 the preparation of 2-(4-chlorophenylethyl)-2-tert.-butyl-oxirane
    Patent number: 4988829
    Abstract: A process for making the known fungicide intermediate 2-(4-chlorophenyl ethyl)-2-tert.-butyloxirane of the formula ##STR1## comprising (a) mixing a solution of trimethylsulphonium bromide of the formula(CH.sub.3).sub.3 S.sup..sym. Br.sup..crclbar. (II)in a methanol/toluene mixture with preheated toluene and simultaneously distilling off a methanol/toluene mixture at a temperature between 65.degree. and 110.degree. C. until a suspension having a solids content between 10 and 70% by weight is formed, and(b) reacting the suspension of trimethylsulphonium bromide in toluene thus obtained with 1-(4-chlorophenyl)-4,4-dimethylpentan-3-one of the formula ##STR2## in the presence of solid potassium hydroxide, diethylene glycol and water at a temperature between 20.degree. and 120.degree. C.
    Type: Grant
    Filed: June 30, 1989
    Date of Patent: January 29, 1991
    Assignee: Bayer Aktiengessellschaft
    Inventors: Paul Fiedler, Martin Littmann, Manfred Lenthe, Achim Noak, Gerd Siekmann