Patents Examined by Rosalyn Keys
  • Patent number: 6583313
    Abstract: The methyl and ethyl esters of trifluoroacetic acid or chlorodifluoroacetic acid can be prepared in a technically simple manner from the corresponding acid chlorides and methanol or ethanol, respectively, in the presence of an “onium” salt of the acid as a catalyst. The alcohol is used in a stoichiometric excess, namely the molar ratio of alcohol to acid chloride is selected such that operation is in the region of a two-phase reaction. One of the phases is formed by the desired ester product, which is obtained in a high purity without any distillation.
    Type: Grant
    Filed: July 10, 1998
    Date of Patent: June 24, 2003
    Assignee: Solvay Fluor und Derivate GmbH
    Inventors: Max Braun, Kerstin Eichholz, Werner Rudolph