Process for the preparation of branched 1,3-glycols and their monoesters
CA 2001968 A1 · Owner: Rahkola, Hakan · Inventors: Sjoberg, Kjell; Rahkola, Hakan; Ankner, Kjell
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process for the preparation of diols of the general formulae I, (I) and/or its monoesters of the general formulae II (II), and/or the general formulae III, ( III) wherein R1 and R2 are the same or different and each denotes a lower alkyl having 1 to 4 carbon atoms preferably a methyl, whereby aldehydes containing a hydrogen atom in alfa position are condensed in a multi phase reaction environment and having the general formulae IV, (IV), wherein R1 and R2 have the meanings given above in the presence, of a catalytic system consisting of a phase transfer catalyst and an alkaline substance.
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
- Filed November 1, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 1, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 1, 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.