Process for preparation of lineatin
CA 1192208 A · Owner: Oehlschlager, Allan C. · Inventors: Johnston, Blair D.; Oehlschlager, Allan C.; Slessor, Keith N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Synthesis of (?)-lineatin (3,3,7-trimethyl-2,9-dioxatricyclo- 3.3.1.04,7nonane) by a four-step sequence from 2,2,4-trimethyl-5,6dihydro-2H-pyran is disclosed. The key step involves the formation of a dichlorocyclobutanone using dichloroketene cycloaddition. Modification of the usual conditions for dichloroketene generation are necessary in order to suppress side reactions in this step. The conversion of the cycloaduct to lineatin are carried out with standard synthetic techniques in an overall yield of 10.12%.
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 August 20, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 20, 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.