Process for preparing beta-ketoester fragrance pro-accords from 1,3-dioxan-4,6-diones
CA 2304779 A1 · Owner: Wos, John August · Inventors: Wos, John August; Schectman, Lee Arnold; Ortiz, Rafael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to methods for preparing .beta.-ketoester fragrance pro-accords from activated acyl units 1,3-dioxan-4,6-diones and , fragrance raw material alcohols. The first step of the disclosed process involves contacting an activated acyl unit preferably an acid chloride, with , a 1,3-dioxan-4,6-dione an example of which is Meldrum's acid, to form a 2acyl 1,3-dioxan-4,6-dione which is then reacted with a fragrance raw material alcohol to form the final .beta.-ketoester fragrance pro-accord. The resulting .beta.-ketoester fragrance pro-accords are suitable for use in laundry detergent, personal care, and other formulations wherein aesthetic fragrance materials are …
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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
- Filed August 28, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 28, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 28, 2020.
- 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.