Patents by Inventor Knud Lawrenz

Knud Lawrenz 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).

  • Chloropyridinium chlorides and process for their preparation
    Patent number: 5675010
    Abstract: The present invention relates to new chloropyridinium chlorides of the general formula (I) ##STR1## in which R.sup.1 represents in each case optionally substituted alkyl, alkenyl, alkinyl, cycloalkyl, cycloalkylalkyl, arylalkyl or heteroarylalkyl,R.sup.2 represents optionally substituted alkyl, andR.sup.3 represents hydrogen, halogen or optionally substituted alkyl,to a process for their preparation and to their use for the preparation of chloropyridines.
    Type: Grant
    Filed: May 8, 1996
    Date of Patent: October 7, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Reinhard Lantzsch, Klaus Jelich, Carl Casser, Christoph Mannheims, Knud Lawrenz
  • Chloropyridinium chlorides and process for their preparation
    Patent number: 5541332
    Abstract: A process for the preparation of a chloropyridine of the formula ##STR1## which comprises reacting an enamide of the formula ##STR2## with a chlorinating agent in the presence of a di-substituted formamide ##STR3## in which R.sup.4 and R.sup.5 each individually is alkyl or cycloalkyl or together are alkanediyl, at a temperature between about -30.degree. C. and 100.degree. C., thereby to produce a compound of the formula ##STR4## and subjecting said compound to thermal cleavage. Compounds I are novel. Compounds IV are known intermediates for agrochemicals and pharmaceuticals.
    Type: Grant
    Filed: January 4, 1995
    Date of Patent: July 30, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Reinhard Lantzsch, Klaus Jelich, Carl Casser, Christoph Mannheims, Knud Lawrenz