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. 16, 2015
Filed:
Feb. 29, 2012
Christian Funke, Leichlingen, DE;
Taraneh Farida, Pulheim-Geyen, DE;
Stefan Beeck, Meerbusch, DE;
Norbert Lui, Odenthal, DE;
Berndt Maiwald, Burschied, DE;
Christian Funke, Leichlingen, DE;
Taraneh Farida, Pulheim-Geyen, DE;
Stefan Beeck, Meerbusch, DE;
Norbert Lui, Odenthal, DE;
Berndt Maiwald, Burschied, DE;
BAYER INTELLECTUAL PROPERTY GMBH, Monheim, DE;
Abstract
Process for preparing sodium or potassium salts of 4-hydroxy-2-oxo-2,5-dihydrofuran-3-carboxylic esters, comprising the reaction of a malonic ester with potassium hydroxide to give the corresponding malonic ester potassium salt of the formula (III) which is then reacted further with a chloroacetic ester to give a compound of the formula (V) followed by a ring closure reaction in which the compound of the formula (V) is reacted with a sodium or potassium alkoxide of the formula ZORwhere R, R, Rand K are each as defined in the description.