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:
Oct. 07, 1980
Filed:
Dec. 13, 1978
Karl H Klingler, Langen, DE;
Horst Traube, Dreieich, DE;
Deutsche Gold- und Silber-Scheideanstalt vormals Roessler, Frankfurt, DE;
Abstract
Optically active bases are prepared by reacting the racemic base with an optically active half amide of an unsaturated aliphatic dicarboxylic acid of the formula ##STR1## where R.sub.1, R.sub.2 and R.sub.3 are the same of different and are hydrogen, halogen, a hydroxy group, a methyl group or a methoxy group or two of R.sub.1, R.sub.2 and R.sub.3 together are a methylenedioxy group, R.sub.4 is hydrogen or a methyl group, R.sub.5, R.sub.6 and R.sub.7 independently are hydrogen or a C.sub.1 -C.sub.4 alkyl group and n is 0 or 1 and optionally splitting an optically homogeneous salt fraction into the corresponding optically active base and the added half amide.