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Expired Canadian patentCanada

Electrophilic fluorination of organic compounds

CA 1064475 A · Owner: Research Institute For Medicine And Chemistry Inc. · Inventors: Hesse, Robert H.; Barton, Derek H.R.

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Abstract From the Canadian patent

Saturated organic compounds containing a hydrogen atom bound to a tertiary carbon atom may be electrophilically fluorinated by reacti?n with an electrophilic fluorinating agent such as molecular fluorine or trifluoromethyl hypofluorite under conditions whereby the formation of free fluorine radicals is suppressed, e.g. by the presence of a free radical inhibitor such as oxygen or nitrobenzene the reactants, being substantially homogeneously dispersed in a liquid medium, e.g. A solvent medium such as fluorotrichloromethane or chloroform/fluorotrichloromethane. so that the said hydrogen atom is electrophilically replaced by a fluorine atom. The fluoroination is highly selective and, in the …

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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 October 16, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 16, 1996.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedOctober 16, 1979
Term endedOctober 16, 1996
Patent numberCA 1064475 A
Classification (IPC)C07C23/20 +2 more

Timeline

Timeline From CIPO dates

198019821984198619881990199219941996Patent grantedOct 16, 1979Term endedOct 16, 1996

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.