Patents by Inventor Volker Ka/ ss

Volker Ka/ ss 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 preparing 2-chloro-benzothiazoles or 2-chloro-benzoxazoles
    Patent number: 5502201
    Abstract: The title compounds of the formula ##STR1## in which R.sup.1 and R.sup.2, independently of one another, represent hydrogen, straight-chain or branched C.sub.1 -C.sub.4 -alkyl, straight-chain or branched C.sub.1 -C.sub.4 -alkoxy, nitro, fluorine, chlorine, bromine, SO.sub.2 Cl, cyano or SO.sub.2 -C.sub.1 -C.sub.4 -alkyl, andX represents sulphur or oxygen,can be prepared from the corresponding 2-mercapto-benzothiazoles or 2-mercapto-benzoxazoles by chlorination with thionyl chloride in the presence of phosphorous acid compounds of the formulaYP(OR.sup.5).sub.2 (III),in whichR.sup.5 represents hydrogen, straight-chain or branched, substituted or unsubstituted C.sub.1 -C.sub.12 -alkyl, phenyl or C.sub.7 -C.sub.10 -aralkyl andY represents hydrogen or OR.sup.5.
    Type: Grant
    Filed: April 20, 1994
    Date of Patent: March 26, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventor: Volker Ka/ ss