Process for the preparation of 2-alkylthiobenzonitrile derivatives
CA 2295910 A1 · Owner: Truchon, Alain · Inventors: Bernard, Didier; Truchon, Alain
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a process for preparing compounds of formula (I) wherein R1 represents C1-6alkyl; R2 represents C1-6haloalkyl C1-6alkyl, C1-, 6haloalkoxy, C1-6alkoxy SOnR5 or halogen; R4 represents hydrogen C1-, 6haloalkoxy, C1-6alkoxy, SOnR5 or halogen; or a 5 or 6-membered heterocyclic ring (which may be unsaturated or partially saturated) containing 1 to 3 hetero atoms selected from oxygen, nitrogen and sulphur optionally , substituted by halogen, C1-6haloalkyl C1-6alkyl, C1-6haloalkoxy, C1-6alkoxy, SOnR5 nitro or cyano; R5 represents C1-6alkyl; and n represents 0 1 or 2; , which comprises reacting a compound of formula (II) wherein R2 and R4 are as hereinbefore and R3 …
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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
- Filed July 3, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 3, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 3, 2020.
- 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.