Process for producing 2-isocyanato-2,3-dehydro carboxylic esters
CA 1269396 C · Owner: Drauz, Karlheinz · Inventors: Kuhlwein, Jurgen; Effenberger, Franz; Drauz, Karlheinz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
2-isocyanato-2,3-dehydrocarboxylic acid esters having the general formula, wherein R1 represents a straight-chain or branched (C1-C4)alkyl radical, a phenyl radical or a benzyl radical and R2 represents, hydrogen or a methyl radical and R3 represents a straight-chain or branched (C1-C16)alkyl radical, a (C3-C8)cycloalkyl radical a (C1-C6)alkyl-mercapto radical or a phenyl radical are pro-, duced by reacting 2-azido-carboxylic acid esters having the general formula, (II), in an inert solvent at a temperature of between 0 and 150°C in the presence of a perrhenate with phosgene or diphosgene. The compounds having the general formula (I) can be converted with benzyl alcohol or with tert-butyl …
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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 May 22, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 22, 2007.
- 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.