PROCEDE DE FABRICATION DE L'ACIDE HYDROXY-4, DIMETHOXY-3,5 BENZOIQUE A PARTIR DE L'ACIDE TRIMETHOXY-3,4,5 BENZOIQUE

PROCEDE DE FABRICATION DE L'ACIDE HYDROXY-4, DIMETHOXY-3,5 BENZOIQUE A PARTIR DE L'ACIDE TRIMETHOXY-3,4,5 BENZOIQUE

Demethylation of the 3,4,5-trimethoxybenzoic acid is carried out in the presence of an excess of alkali hydroxide in an amount of ethylene glycol just sufficient to obtain a heterogeneous medium sufficiently fluid in the course of the operation. The ethylene glycol monomethyl ether and the water for...

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Bibliographische Detailangaben
Hauptverfasser: Y. CHRISTIDIS, M. SOREAU
Format: Patent
Sprache:fre
Schlagworte:
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Zusammenfassung:Demethylation of the 3,4,5-trimethoxybenzoic acid is carried out in the presence of an excess of alkali hydroxide in an amount of ethylene glycol just sufficient to obtain a heterogeneous medium sufficiently fluid in the course of the operation. The ethylene glycol monomethyl ether and the water formed are distilled off progressively with their production and the resulting 4-hydroxy-3,5-dimethoxybenzoic acid is separated by acidification by means of a strong acid and crystallization.