Process for the preparation of 5-fluorotoluene-2,4- disulphochloride
CA 1283424 C · Owner: Diehl, Herbert · Inventors: Kasbauer, Josef; Diehl, Herbert; Wedemeyer, Karlfried
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the preparation of 5-fluorotoluene-2,4disulphochloride, ABSTRACT OF THE DISCLOSURE 5-Fluorotoluene-2,4-disulphochloride is prepared by chlorosulphonation of 3-fluorstoluene by first reacting the 3-fluorotoluene with chlorosulphonic acid and then with an inorganic acid chloride at temperatures up to 130°C until the evolution of gas is complete and, then heating the reaction mixture at temperatures of up to 200°C and, after ehe completion of the gas evolution reacting the product at a lower temperature with further inorganic acid chloride, or reacting the 3-fluorotoluene with powerful sulphonating agents at an elevated temperature, if appropriate in the presence of inert solvents …
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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 April 23, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 23, 2008.
- 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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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.