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:
Nov. 15, 1977
Filed:
May. 30, 1975
Applicant:
Inventors:
Otto Ackermann, Troisdorf-Sieglar, DT;
Otto Bleh, deceased, LATE OF Troisdorf-Bergheim, DT;
Walter Rogler, Bonn, DT;
Assignee:
Dynamit Nobel Aktiengesellschaft, Troisdorf, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
560180 ;
Abstract
Preparation of alkoxymethylene malonic acid ester of formula: ##STR1## wherein R and each R' is an alkyl group, by reaction of malonic acid diester and ortho formic acid triester. The reaction is performed in the presence of a carboxylic acid or a carboxylic acid anhydride and a Lewis acid. The ortho ester is initially present in amount of at least 1,4 mols per mole of the malonic acid ester starting material. Alcohol formed during the reaction is removed during the reaction.