Purification of 5-pyrimidinecarboxamides
CA 1284641 C · Owner: Brewer, Arthur D. · Inventors: Brewer, Arthur D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is provided for the purification to highly purified states of 5-Pyrimidinecarboxamides which are essentially insoluble in both organic and inorganic solvents. The 5-Pyrimidinecarboxamide to be purified is contacted with an organic base to form an adduct. The adduct is purified through recrystallization and the desired 5-Pyrimidinecarboxamide is regenerated from the adduct in highly purified form with acid. Additionally an adduct resulting from the combination of a 5-Pyrimidinecarboxamide with an organic base is provided which adduct is capable of being purified using recrystallization techniques, where the 5-Pyrimidinecarboxamide is not itself capable of being so purified due to …
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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 June 4, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 4, 2008.
- 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.