Process for the preparation of o-substituted hydroxylamines
CA 2035405 A1 · Owner: Ciba-Geigy Ag · Inventors: Schneider, Hans-Dieter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PS/5-l7917/=, Process for the preparation of O-substituted hydroxylamines Abstract, O-substituted hydroxylamines of the formula I H2NOR1 (I), in which, R1 is C1-C6alkyl C1-C6haloalkyl,-CH2CR2=CR3R4 or -CH2C=CR5; R2 is hydrogen, halogen or methyl;, R3 is hydrogen halogen or methyl;, R4 is hydrogen, halogen or methyl; and R5 is hydrogen, methyl or ethyl, are prepared by reacting a nitrile of the formula II R6-CN (II), in which R6 is C1-C4alkyl, phenyl or benzyl is reacted with an alcohol of the formula III R7-OH (III), in which R7 is C1-C5alkyl benzyl or C1-C4alkoxyethyl, in an organic solvent which is only sparingly miscible with water or not at all in the presence of hydrogen halide HX, the …
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 January 31, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 31, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 31, 2013.
- 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.