Any of three isomeric acids, C6H4(COOH)2, esp. one (ortho-phthalic acid) obtained by oxidation of naphthalene or xylene and used in the manufacture of dyes, medicines, etc.
Webster's New World
Other Word Forms of Phthalic Acid
Phthalic Acid Sentence Examples
This is obviously unsymmetrical, consisting of an aliphatic and an aromatic nucleus; Claus explained the formation of the same phthalic acid from the oxidation of either nucleus by supposing that if the aromatic group be oxidized, the aliphatic residue assumes the character of a benzene nucleus.
Chromic acid oxidizes it to retene quinone, phthalic acid and acetic acid.
It acts as a weak antiseptic. It is used for enriching coal gas, as a vermin killer, in the manufacture of certain azo dyes, and in the preparation of phthalic acid (q.v.).
Chromic acid in glacial acetic acid solution oxidizes it to picene-quinone, picene-quinone carboxylic acid, and finally to phthalic acid.
By oxidation with alkaline potassium permanganate it yields phthalic acid and cinchomeronic acid.