Patents by Inventor Bernd Schaeffer

Bernd Schaeffer 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 .alpha.-chloro phosphorus ylides
    Patent number: 5132448
    Abstract: .alpha.-Chloro phosphorus ylides of the formula I ##STR1## where the Ar radicals are identical or different aryl groups, and E is a substituent which stabilizes the ylide (I), are prepared by reacting a phosphonium salt of the formula II ##STR2## where Hal is chlorine, bromine or iodine, with a chlorinating agent, using bleaching powder as chlorinating agent.
    Type: Grant
    Filed: September 11, 1990
    Date of Patent: July 21, 1992
    Assignee: BASF Aktiengesellschaft
    Inventor: Bernd Schaeffer