Separation of p-fluoroaniline from the unsubstituted derivative
CA 1270855 C · Owner: Wevers, Jan H. · Inventors: Gilkerson, Terence; Prillwitz, Peter E.; Wevers, Jan H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a process for separating a para- fluoro aniline from a corresponding para-unsubstituted aniline characterised by dissolving a starting mixture of a para- fluoro aniline of general formula I, (I), wherein one of R1 R2, R3 and R4 is a hydrogen atom, a halogen atom, a C1-3alkyl group or a CF3 group the others being, independently selected from hydrogen atoms halogen atoms and, C1-3 alkyl groups, and R5 and R6 are selected from hydrogen and alkyl groups, and a corresponding para-unsubstituted aniline of general formula II, (II), wherein R1, R2 R3, R4, R5 and R are the same as in formula I BX39.007, in an aqueous solution of a non-oxidising acid and cooling the, solution …
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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 June 26, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 26, 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
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.