Process for preparing n,n'-bis(hydrocarbyloxycarbonyl) -n,n'-bis (2,2,6,6-tetramethyl-4-piperidyl)diamines
CA 2085090 A1 · Owner: Da Roit, Giovanni · Inventors: Carrozza, Primo; Barzatta, Valerio; Da Roit, Giovanni
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel process for preparing N.N'-bis(hydrocarbyloxycarbonyl)-N.N'-bis(2.2.6.6-tetramethyl-4-piperidyl)diamines Abstract of the disclosure, A process for preparing a compound of the formula (I) (I), in which R1 is e.g. hydrogen, R2 is e.g. C2-C12alkylene and R3 is e.g. C1-C18aLkyl; which process comprises reacting, in water in the absence of an organic solvent, a compound of the formula (II), C1-COOR3(II) wherein R3 is as defined above with a compound of the formula (III) (III), where R1 is e.g. as defined above and R2' is e.g. as defined above for R2 at a temperature, of from 0" to 60°C, 1 to 1.5 mol of the compound of the formula (II) being used per mol -NH- group in the compound of the …
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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 December 10, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 10, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 10, 2014.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.