Method of preparing alkoxymethylenemalonic acid esters
US4058553A · kind A · utility
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1References
5Claims
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Key dates
| Filing date | May 30, 1975 |
| Grant date | Nov 15, 1977 |
| Priority date | — |
| Expiry date | May 30, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C69/708
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.