A catalyst for asymmetric induction
CA 2087472 A1 · Owner: Inoue, Shohei · Inventors: Inoue, Shohei; Mori, Atsunori
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A catalyst for asymmetric induction is provided which comprises an amino acid amide derivative represented by the formula I:, (I), wherein R' represents an isopropyl group etc. R2 and, R3 are the same or different and each represents a lower alkyl group, etc. R4 represents a chlorine atom etc. R5, R6 and R7 are the same or different and each represents a hydrogen atom, etc. and * denotes an abosolute configuration of S or R, and a titanium (IV) alkoxide. Optically active cyanohydrins are obtained in high yield and at high purity by addition of hydrogen cyanide to aldehyde compounds in the presence of the above mentioned catalyst.
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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 January 18, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 18, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 18, 2015.
- 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.