Process for the manufacture of 3-acylazo-propionic acid esters and isomers thereof
CA 1162926 A · Owner: Schering Aktiengesellschaft · Inventors: Kruger, Hans-Rudolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
3-Acylazo-propionic acid esters of the general formula I, (I), and isomers thereof (in which R1 represents C1-C6-alkyl and R2 represents alkoxy or amino), suitable as starting materials for the manufacture of 1,2,3-thiadiazole-5-carboxylic acid derivatives, are prepared by a process which comprises reacting an acrylic acid ester of the general formula H2C = CH - COOR1 with a hydrazine derivative of the general formula H2N - NH - CO -R2 to form a 3-acylhydrazino-propionic acid ester of the general formula and oxidizing this ester in an inert solvent with an oxidizing agent.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted February 28, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 28, 2001.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.