Halogen exchange reactions and uses thereof
CA 2271379 A1 · Owner: Nazarenko, Tatjana · Inventors: Balhoff, John F.; Bildinov, Igor; Podsevalov, Pavel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A mixture of (i) finely-divided alkali metal fluoride (e.g. KF) (ii) , haloaromatic compound having at least one halogen atom of atomic number greater than 9 on an aromatic ring (e.g. C6Cl6) and (iii) an , aminophosphonium catalyst (e.g. Et2N)4PBr) is heated at a temperature at , which fluorine replaces one or more of the ring halogen atom of the haloaromatic compound. Processes are described wherein fluorinated perhalobenzenes such as C6ClF5 and C6BrF5 formed in this manner are converted efficiently and at low cost to a variety of industrially important products.
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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 November 21, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 21, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 21, 2019.
- 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.