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. 17, 2009
Filed:
Aug. 10, 2007
Ralf Jackstell, Cuxhaven, DE;
Irina Jovel, Rostock, DE;
Matthias Beller, Ob Nienhagen, DE;
Martin Hateley, Aschaffenburg, DE;
Christoph Weckbecker, Gründau-Lieblos, DE;
Klaus Huthmacher, Gelnhausen, DE;
Ralf Jackstell, Cuxhaven, DE;
Irina Jovel, Rostock, DE;
Matthias Beller, Ob Nienhagen, DE;
Martin Hateley, Aschaffenburg, DE;
Christoph Weckbecker, Gründau-Lieblos, DE;
Klaus Huthmacher, Gelnhausen, DE;
Evonik Degussa GmbH, Essen, DE;
Abstract
The present invention relates to the preparation of α-hydroxy ketones of the general formula I. In particular, the invention relates to novel imidazolinium carboxylate adducts and to a novel process for using catalytic amounts of imidazolium and imidazolinium carboxylate adducts in the acyloin reaction of aldehydes to prepare hydroxy ketones of the general formula I, where R and R' are the same or different and are each H or a straight-chain or branched and optionally substituted C-C-alkyl radical, and R″═HCSCHCH, t-butyl, n-butyl, sec-butyl, n-propyl, i-propyl, an optionally heteroatom-substituted C-C-aryl, heteroaryl, C-C-arylalkyl, especially phenylmethyl, where phenyl may again be heteroatom-substituted, or heteroalkyl.