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filingDate 1934-12-22-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationDate 1936-06-22-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber GB-449534-A
titleOfInvention Improvements in or relating to the manufacture of carboxylic acids and their salts
abstract Dicarboxylic acids of dihydropolycyclic aromatic hydrocarbons are obtained by reacting an alkali metal with a polycyclic aromatic hydrocarbon, in certain aliphatic mono- or poly-ethers or cyclic ethers, alone or mixed with other compounds, as solvents, to form the alkali metal hydrocarbon addition product, followed by conversion to dicarboxylic salts by reaction with carbon dioxide. Specifications 443,361 and 445,417 are referred to. The rate of addition of carbon dioxide to the reaction mixture is such as to decolorize the solution without discharging the colour formed on the surface of the alkali metal. Low temperatures of the range of - 50 to - 80 DEG C. are preferred. According to examples: (1) the alkali salts of dihydronaphthalene dicarboxylic acids are prepared by reacting naphthalene with sodium in dimethyl glycol ether under an atmosphere of nitrogen, and passing in carbon dioxide as described, and also performing the reaction in dimethyl ether; (2) alkali salts of dihydrodiphenyldicarboxylic acids are obtained by reacting diphenyl with sodium and carbon dioxide in dimethyl-ether. The products are the salts of isomeric mixtures of dicarboxylic acids. Samples have been furnished under Sect. 2 (5) of dihydrodicarboxylic acids obtained from 1 - methylnaphthalene, acenaphthene, phenanthrene, and anthracene.
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priorityDate 1934-08-27-04:00^^<http://www.w3.org/2001/XMLSchema#date>
type http://data.epo.org/linked-data/def/patent/Publication

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