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. 17, 2004
Filed:
Aug. 16, 2002
Andreas Kuever, Alfter, DE;
Artur Hunds, Bonn, DE;
Degussa AG, Duesseldorf, DE;
Abstract
The invention relates to a process for the preparation of 4,6-dihydroxypyrimidine by reaction of malonic ester with formamide and alkali metal alkoxide. The malonic ester is added alone or simultaneously with the total quantity or a portion of the formamide, in portions or continuously with monitoring of the temperature, to the alkali metal alkoxide prepared as a solution or suspension in an alcohol, alone or together with the total quantity or remaining quantity of the formamide. A temperature of from 102 to <120° C. is then set for from 10 to <60 minutes. The work-up after the holding time in said temperature range is then carried out by methods known per se.