Process for the production of 6-methylnicotinic acid ester
CA 1237434 A · Owner: Lonza Ltd. · Inventors: Grayson, James I.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the production of 6-methylnicotinic acid ester by oxidation of 2-methyl-5-ethylpyridine at an elevated temperature. Specifically, 2-methyl-5-ethylpyridine is mixed while cooling with at least a molar quantity of sulfuric acid. The mixture is heated to a temperature of 140° to 225°C. At least 3 moles of nitric acid per mole of educt is added to the heated mixture in such a way that water and/or diluted nitric acid are continuously distilled off. The distillation after addition of the nitric acid which is needed for the oxidation is continued until all of the water and all of the nitric acid are removed. Subsequently the reaction mixture is mixed with an alcohol and the alcoholic …
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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 May 31, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 31, 2005.
- 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
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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.