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. 05, 1996
Filed:
Jun. 27, 1994
Rolf Fischer, Heidelberg, DE;
Werner Hoffmann, Neuhofen, DE;
Ernst Langguth, Kirchheim, DE;
Hardo Siegel, Speyer, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
A process for the preparation of a 5-vinylpyrrolidone of the formula ##STR1## wherein each of R.sup.1 and R.sup.2 is hydrogen or alkyl and R.sup.3 is preferably hydrogen but may further represent alkyl, cycloalkyl, aryl, alkylaryl, arylalkyl or a 5- to 6-membered aromatic or non-aromatic heterocyclic group containing 1 to 3 nitrogen atoms and/or an oxygen or sulfur atom, the process being carried out in two steps, first to react a 3-formylpropionic acid ester of the formula ##STR2## where each of R.sup.1 and R.sup.2 is hydrogen or C.sub.1 -C.sub.8 -alkyl, and R.sup.4 is hydrogen, alkyl, cycloalkyl, aryl, alkylaryl or arylalkyl, with a vinylymagnesium halide of the formula