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:
Sep. 08, 2026
Filed:
Apr. 26, 2022
Applicant:
Dsm Ip Assets B.v., Heerlen, NL;
Inventors:
Werner Bonrath, Kaiseraugst, CH;
Rolf Kuenzi, Kaiseraugst, CH;
Meltem Tirpanci, Kaiseraugst, CH;
Thomas Netscher, Kaiseraugst, CH;
Assignee:
DSM IP ASSETS B.V., Maastricht, NL;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D 311/72 (2006.01); C07D 311/92 (2006.01);
U.S. Cl.
CPC ...
C07D 311/72 (2013.01); C07D 311/92 (2013.01);
Abstract
The present invention relates to the formation of compound of the formula (I) by a ring closure reaction of the compound of the formula (II) in the presence of a catalytic amounts of a base. It has been found that this reaction is very efficient and offers for example an efficient pathway for the synthesis of 3,4-dehydro-α-tocotrienol respectively α-tocotrienol and α-tocopherol.