Process for the production of 2-chloro-5-chloromethyl-pyridine
CA 2095953 A1 · Owner: Lonza Ltd. · Inventors: Studer, Philipp; Werbitzky, Oleg
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the production of 2-chloro-5chloromethyl-pyridine of the formula:, I from 6-hydroxynicotinic acid of the formula: II, In a first step, 6-hydroxynicotinic acid (II) is reacted with an acid chloride to produce 6-hydroxynicotinoyl chloride of the formula:, III, The latter is then catalytically hydrogenated with hydrogen to produce 6-hydroxynicotinic acid aldehyde of the formula: IV, The latter is then catalytically hydrogenated with hydrogen to produce 2-hydroxy-5-hydroxymethylpyridine of the formula:, V, which is then chlorinated to produce 2-chloro-5chloromethyl-pyridine according to formula I.
Read the whole patent
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
- Filed May 11, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 11, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 11, 2015.
- 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.