Preparation of conjugated dienes
CA 2003568 A1 · Owner: Goodall, Brian L. · Inventors: Cornelis, Jacob; Sar, Van D.; Terlouw, Willem
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of a compound of general formula, (I), in which R1 represents a hydrogen atom or a methyl group, one of R2 and R3 represents a hydrogen atom and the other of R2 and R3 is the same as R1 which, comprises reacting a compound of general formula R1-CH=C=CH2 (II), with a salt of formic acid in the presence of a catalyst system comprising a palladium salt and a phosphorus compound of general formula P(OX)n(X)3-n (III), in which n is 0,1,2 or 3 and each X independently represents an alkyl, alkenyl, aryl, aralkyl alkaryl, or cycloalkyl group, and recovering the desired compound of formula (I). PS11010
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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 22, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 22, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 22, 2011.
- 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.