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CAS Number: 88-99-3
Molecular Weight: 166.13
Linear Formula: C6H4-1,2-(CO2H)2
IUPAC Names: Benzene-1,2-dicarboxylic acid
Other Names: Benzene-1,2-dioic acid, Phthalic acid, Ortho-phthalic acid
Phthalic acid is an aromatic dicarboxylic acid, aromatic dicarboxylic acid, with formula C6H4(CO2H)2. It is an isomer of isophthalic acid and terephthalic acid.
Although phthalic acid is of modest commercial importance, the closely related derivative phthalic anhydride is a commodity chemical produced on a large scale.