Process for manufacture of imidazoles
CA 2428857 A1 · Owner: Arduengo, Anthony J. Iii · Inventors: Gentry, Frederick P. Jr.; Arduengo, Anthony J. Iii; Simmons, Howard E. Iii
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Imidazoles may be manufactured by reacting a glyoxal ammonia, an aldehyde, and optionally a primary amine in the presence of a Bronsted acid whose pKa is approximately equal to the pKa of the ammonium cation of the primary amine or if the primary amine is not present to the pKa of the ammonium (NH4+) , cation. The reaction may be used to make in relatively high yields a wide variety of imidazoles using relatively inexpensive starting materials. The imidazoles are useful as chemical intermediates. Formula (V) and formula (IX).
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 November 16, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 16, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 16, 2022.
- 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.