Process for the preparation of 1,1-dihalo-4-methyl-1, 3-pentadienes
CA 1107300 A · Owner: Fmc Corporation · Inventors: Scharpf, William G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel processes for the preparation of 1,1-dihalo-4methyl-1,3-pentadienes, key intermediates in the synthesis of dihalovinylcyclopropanecarboxylates are described. The, processes begin with the condensation of a vinylidene halide and an isobutyryl halide in the presence of a Lewis acid catalyst, followed by reduction of the 1,1-dihalo-4-methyl- 1-penten-3-one produced thereby, and dehydration of the resulting 1,1-dihalo-3-hydroxy-4-methyl-1-pentene.
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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 August 18, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 18, 1998.
- 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.