Resolution of racemic pantolactone
CA 1056388 A · Owner: Basf Aktiengesellschaft · Inventors: Von Fraunberg, Karl; Paust, Joachim; Himmele, Walter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for resolving racemic .alpha.-hydroxy-.beta..beta.-dimethyl-?-butyrolactone referred to as D,L-, pantolactone, into its optical antipodes based on the sepa-, ration of diastereomeric salts of D,L-pantoic acid (.alpha.?-dihydroxy- .beta..beta.-dimethylbutyric acid), produced from D,L-pantolactone by, means of (-)-3-aminomethylpinane, (+)-3-aminomethylpinane or one of their acid addition salts, as a new resolving agent.
Read the whole patent
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 12, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 12, 1996.
- 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.