Ethynylbenzenes
CA 1113125 A · Owner: Rorer (William H.), Inc. · Inventors: Douglas, George H.; Campbell, Henry F.; Darkes, Paul R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is disclosed a novel process for preparing anti-inflammatory ethynylbenzene derivatives represented by the general formula I:, I, wherein Y is hydrogen halogen or loweralkyl of 1 to 3 carbon atoms; R may stand for a ring of the structure: wherein x is 1 to 3, or a ring of the structure: wherein Y' is hydrogen. halogen. loweralkyl of 1-3 carbon atoms and loweralkoxy of 1-3 carbon atoms; Y" is hydrogen or halogen; and Y''' is hydrogen or halogen, provided Y Y', Y" and Y''' are, not all hydrogen at the same time by reacting a benzyl alcohol, of formula V: V, with a sulfonyl chloride, reducing the sulfonate VI of the formula:, VI, and dehydrohalogenating the formed .beta.-halostyrene of …
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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 November 24, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 24, 1998.
- 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.