Process for the preparation of optically active secondary amines
CA 1304373 C · Owner: Ciba-Geigy Ag · Inventors: Pugin, Benoit; Ramos, Gerardo; Spindler, Felix
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
6-16608/+, Process for the preparation of optically active secondary amines Abstract, Asymmetric hydrogenation of prochiral N-aliphatic ketimines to give optically active secondary amines at a temperature from -20 to 80°C a hydro-gen pressure of 105 to 107 Pa, with the addition of catalytic amounts of an iridium compound of the formula III or IIIa XIrYZ (III) or XIrY?A? (IIIa), in which X is two olefin ligands or a diene ligand Y is a chiral diphos-, phine the secondary phosphine group of which are attached through 2-4 C atoms and which, together with the Ir atom forms a 5-membered, 6-membered, or 7-membered ring or Y is a chiral diphosphinite the phosphinite groups of which are attached …
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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 June 30, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 30, 2009.
- 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
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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.