Phthalic acid
Aromatic organic compound with formula C6H4(COOH)2 / From Wikipedia, the free encyclopedia
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In organic chemistry, phthalic acid is an aromatic dicarboxylic acid, with formula C6H4(CO2H)2 and structure HO(O)C−C6H4−C(O)OH. Although phthalic acid is of modest commercial importance, the closely related derivative phthalic anhydride is a commodity chemical produced on a large scale.[4] Phthalic acid is one of three isomers of benzenedicarboxylic acid, the others being isophthalic acid and terephthalic acid.
Quick Facts Names, Identifiers ...
Names | |
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Preferred IUPAC name
Benzene-1,2-dicarboxylic acid | |
Other names
1,2-Benzenedioic acid Phthalic acid Benzene-1,2-dioic acid ortho-Phthalic acid Dicarboxylbenzene Carboxylbenzoic acid 1,2-Phenylenedicarboxylic acid Phenylene-1,2-dicarboxylic acid | |
Identifiers | |
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3D model (JSmol) |
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ChEBI | |
ChemSpider |
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ECHA InfoCard | 100.001.703 |
EC Number |
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PubChem CID |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
C8H6O4 | |
Molar mass | 166.132 g/mol |
Appearance | white solid |
Density | 1.593 g/cm3, solid |
Melting point | 207 °C (405 °F; 480 K)[1] |
0.6 g / 100 mL [2] | |
Acidity (pKa) | 2.89, 5.51[3] |
-83.61·10−6 cm3/mol | |
Hazards | |
NFPA 704 (fire diamond) | |
Related compounds | |
Related carboxylic acids |
Isophthalic acid Terephthalic acid |
Related compounds |
Phthalic anhydride Phthalimide Phthalhydrazide Phthaloyl chloride Benzene-1,2- dicarboxaldehyde |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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