Process for the preparation of derivatives of 4, 5-dihydrooxazoles
CA 1256109 A · Owner: Chemie Linz Aktiengesellschaft · Inventors: Binder, Dieter; Rovenszky, Franz; Ferber, Hubert P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for the preparation of novel derivatives of 4,5-dihydrooxazoles of the formula I, I, in which, A denotes -CH=CH- or -S- R1, R3 and R4, independently of one another denote, hydrogen or lower alkyl, R2 denotes hydrogen or lower alkoxy and, n denotes 0 or 1, in which a compound of the formula II, II, in which A has the meaning given in formula I is reacted, with a compound of the formula III III, in which X represents chlorine or bromine and R1 R2, R3, and R4 have the meaning given in formula I in the presence, of a strong base, and the product is subsequently oxidized if appropriate, to form a sulfoxide. The compounds of the formula I cause a blockage 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 June 20, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 20, 2006.
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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.