Process for the preparation of bisphosphine dioxides
CA 1195343 A · Owner: Shell Canada Limited · Inventors: Van Oort, Aart B.; Van Leeuwen, Petrus W.N.M.; Van Doorn, Johannes A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of a bisphosphine dioxide with formula, in which R1, R2, R3 and R4 being the same or different, re-, present substituted or unsubstituted alkylaryl-, alkaryl- or, aralkyl groups or an alkylene group is formed by R1 and R2 and/or R3 and R4 respectively, R5 represents H R6 represents H, or a substituted or unsubstituted alkylaryl-, alkaryl- or, aralkyl group, or R5 and R6 form an alkylene group by contacting in an aprotic solvent and in the presence of a basic compound, an oxirane with formula: with, one or more phosphine oxides with formula: and/or
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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 15, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 15, 2002.
- 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.