Insecticidal ester
CA 1263402 C · Owner: Imperial Chemical Industries Plc · Inventors: Whittle, Alan John; Doyle, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is described by which the pair of isomers represented by (R)- ?-cyano-4-fluoro-3-phenoxybenzyl (1R,cis)-3-(Z-2-chloro-3,3,3-trifluoroprop-1-en-1-yl)-2,2dimethylcyclopropane carboxylate and its enantiomer is converted by base catalysed epimerisation in solution into the insecticidally more useful isomer pair represented by (S)-?-cyano-4-fluoro-3-phenoxybenzyl (1R,cis)-3-(Z-2chloro-3,3,3-trifluoroprop-1-en-1-yl)-2,2-dimethylcyclopropane carboxylate and its enantiomer which may then be, caused to crystallise out from the solution.
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
- Granted November 28, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 28, 2006.
- 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.