A process for producing an aromatic compound by electrophilic reaction and aromatic compound derivatives
CA 2098239 C · Owner: Ohtani, Takashi · Inventors: Takaishi, Hideo; Hamaguchi, Hiroshi; Ohtani, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There are disclosed a process for producing an aromatic compound of the formula (I) which comprises reacting an electrophilic reagent with a compound of the formula (II) shown below:, wherein X1 and X2, which may be the same or different are, each a halogen atom; R is a group represented by the formula: (wherein R1 and R2, which may be the same or different are, each a hydrogen atom or a C1-C6 alkyl group Z is a cyano, group, -CO-OR3 (wherein R3 is a hydrogen atom or a C1-C6 alkyl group) or -CO-NR4R5 (wherein R4 and R5 which may be, the same or different, are each a hydrogen atom or a C1-C6 alkyl group)); and Y is a nitro group, a halogen atom a, C1-C6 haloalkyl group or a group represented …
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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 June 11, 1993 and granted November 2, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 11, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 11, 2015.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.