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. 04, 2008
Filed:
Feb. 04, 2005
Applicants:
Hansgeorg Ernst, Speyer, DE;
Klaus Henrich, Haβloch, DE;
Andreas Keller, Speyer, DE;
Inventors:
Assignee:
BASF Aktiengesellschaft, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 45/45 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention relates to an improved process for preparing 2,7-dimethylocta-2,4,6-trienedial of the formula I, by  in the presence of a Lewis acid catalyst to give a condensation product of the formula IV,  where the radicals Rand Rin formulae II to IV are independently of one another C-C-alkyl; b) hydrolysis of the acetal groups of IV by adding an aqueous acid to form the dialdehyde of the formula V; d) crystallization of I from the reaction mixture, Wherein process steps a) to d) are carried out in the presence of an inert, water-immiscible organic solvent.