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:
Feb. 19, 2008
Filed:
Jun. 03, 2004
Christian Reufer, Maintal, DE;
Martin Hateley, Aschaffenburg, DE;
Thomas Lehmann, Langenselbold, DE;
Christoph Weckbecker, Gründau-Lieblos, DE;
Rainer Sanzenbacher, Geinhausen, DE;
Jürgen Bilz, Freigericht, DE;
Christian Reufer, Maintal, DE;
Martin Hateley, Aschaffenburg, DE;
Thomas Lehmann, Langenselbold, DE;
Christoph Weckbecker, Gründau-Lieblos, DE;
Rainer Sanzenbacher, Geinhausen, DE;
Jürgen Bilz, Freigericht, DE;
Degussa AG, Essen, DE;
Abstract
A process for the preparation of α-substituted carboxylic acids from the series including α-hydroxycarboxylic acids and N-substituted-α-aminocarboxylic acids by cathodic carboxylation with carbon dioxide of a compound corresponding to the general formula R—C(═X)Rwhich is constituted by aldehydes, ketones or N-substituted imines. In the past, that carboxylation has taken place in an undivided electrolytic cell with the use of a sacrificial anode. As described herein, the carboxylation takes place in the absence of a sacrificial anode in an electrolytic cell divided by a separator, at a diamond film cathode. The anode is formed of a material which is stable under electrolytic conditions; in particular, it is a diamond film electrode. The catholyte includes an organic solvent and a conducting salt.