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:
Jun. 23, 2009
Filed:
Jul. 03, 2006
Peter Pojarliev, Vienna, AT;
Gerhard Steinbauer, Enns, AT;
Christian Burger, Leonding, AT;
DSM Fine Chemicals Austria NFG GmbH & Co KG, Linz, AT;
Abstract
A process for preparing racemic alkyl-5-halopent-4-enecarboxylic acids and esters thereof of the formula (I), in which R is a C-C-alkyl radical, Ris H or C-alkyl and X is chlorine, bromine or iodine, which comprises a) reacting a dialkyl alkylmalonate of the formula (II),in which R is as defined above and Ris a C-C-alkyl radical, in the presence of a metal alkoxide of the formula MOR, in which M may be Na, K or Li, and Ris a C-C-alkyl radical, and in an organic solvent, with 1,3-dihalopropene to give the corresponding allylated malonate, then b) after full conversion, adding an inorganic salt and a C-Calcohol to the reaction mixture, heating the reaction mixture to reflux temperature, then c) isolating the desired racemic ester of the formula (I) from the reaction mixture by extraction or direct distillation and d) if the racemic acid is the desired end product, hydrolyzing the ester function.