The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 12, 1998
Filed:
Feb. 28, 1996
Applicant:
Inventors:
Rainer Hamprecht, Odenthal, DE;
Claudia Muller, Koln, DE;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
558423 ;
Abstract
A process for the preparation of compounds of the formula ##STR1## wherein the substituents X, Y and Z have the meaning given in the description, by reaction of compounds of the formula ##STR2## with a cyanide and an oxidizing agent other than Br.sub.2 in the presence of halides which offers industrial hygiene advantages and renders possible large-scale industrial access to dyestuff syntheses has been found.