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:
Mar. 22, 2022
Filed:
Dec. 18, 2018
Siegfried Ag, Zofingen, CH;
Contraf-nicotex-tobacco Gmbh, Heilbronn, DE;
Beat Theodor Weber, Zofingen, CH;
Ben Pan, Nantong, CN;
SIEGFRIED AG, Zofingen, CH;
CONTRAF-NICOTEX-TOBACCO GMBH, Heilbronn, DE;
Abstract
The present invention relates to a method of separating racemic nicotine of Formula (1-a) as a mixture of the (R)- and (S)-enantiomers into the enantiomerically pure (S)- and (R)-nicotine represented by Formula (1-b) and (1-c), by adding a mixture of the L- and the D-enantiomer of a O,O'-disubstituted tartaric acid, wherein the molar ratio of the L- to the D-enantiomer is from 80:20 to 95:5, and obtaining the (S)-nicotine of formula (1-b), or by adding O,O′-dibenzoyl-D-tartaric acid and obtaining the (R)-nicotine of formula (1-c).