Chiral phosphinite-boranes and their preparation and use
CA 2104013 C · Owner: Laffitte, Jean-Alex · Inventors: Genet, Jean-Pierre; Juge, Sylvain; Laffitte, Jean-Alex
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates, by way of novel industrial products, to the phosphinite-borane compounds of the general formula, (see formula I) in which, R1 and R2, which are identical or different are each a C1-C18-alkyl group, a C5-C18-cycloalkyl group, a C7-C18-aralkyl group or a C6-C14-aryl group it being possible for each of these groups to carry functional groups, R3 is a C1-C18-alkyl C5-C18-cycloalkyl, C7-, C18-aralkyl, C6-C14-aryl C1-C18-alkoxy, C7-C18-cyclo-, alkoxy, C7-C18-aralkoxy or C6-C14-aryloxy group and, Z is a bridge linking the two phosphorus atoms said bridge being (i) a hydrocarbon chain having from 1 to 12 catenary C atoms, or (ii) a heterohydrocarbon chain containing …
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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 February 13, 1992 and granted June 25, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 13, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 13, 2014.
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