The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 31, 1991
Filed:
Jun. 15, 1990
Karl-Heinrich Schulte-Elte, Onex, CH;
Roger L Snowden, Viry, FR;
Claudio Tarchini, Carouge, CH;
Beatrice Baer, Grand-Lancy, CH;
Christian Vial, Le Lignon, CH;
Firmenich SA, Geneva, CH;
Abstract
Process for the preparation of polycyclic ethers of formula ##STR1## wherein X represents --(CH.sub.2).sub.n --, index n stands for integer 0 or 1, symbol R.sup.4 designates a hydrogen atom or a methyl radical, symbols R.sup.1 and R.sup.2, identical or different, represent each a hydrogen atom or a lower alkyl radical from C.sub.1 to C.sub.3 and R designates either a C.sub.1 to C.sub.6 linear or branched alkyl radical, or a substituted or unsubstituted alkylene radical having 2 or 3 carbon atoms in the main chain, said alkylene radical forming a ring such as indicated by the dotted line, which process comprises the cyclization by means of an acidic agent of an unsaturated compound: