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:
Aug. 14, 2018
Filed:
Dec. 09, 2015
Applicant:
Dsm Ip Assets B.v., Heerlen, NL;
Inventors:
Ulla Letinois, Kaiseraugst, CH;
Thomas Netscher, Kaiseraugst, CH;
Assignee:
DSM IP ASSETS B.V., Heerlen, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D 311/04 (2006.01); C07C 1/32 (2006.01); C07F 7/08 (2006.01); C07C 45/00 (2006.01); C07C 37/14 (2006.01); C07C 37/00 (2006.01);
U.S. Cl.
CPC ...
C07D 311/04 (2013.01); C07C 1/321 (2013.01); C07C 37/00 (2013.01); C07C 37/14 (2013.01); C07C 45/00 (2013.01); C07F 7/0809 (2013.01);
Abstract
The present invention relates to a method of preparing chromanes from 2,5-dimethylfuran and substituted alkynes comprising an long chain unsaturated alkyl group as substituent in the alpha position of a substituted phenol followed by oxidation, reduction and acid ring closure. It is particularly advantageous to use 2,5-dimethylfuran as this offers an ecological beneficial synthesis of β-tocopherol.