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| Isophthalic acid | |
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| Other names | Benzene-1,3-dicarboxylic acid meta-Phthalic acid |
| Identifiers | |
| CAS number | [121-91-5] |
| SMILES |
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| Properties | |
| Molecular formula | C6H4(COOH)2 |
| Molar mass | 166.14 g/mol |
| Appearance | White crystalline solid |
| Density | 1.526 g/cm3, Solid |
| Solubility in water | Insoluble in water |
| Hazards | |
| EU classification | not listed |
| Related compounds | |
| Related carboxylic acids | Phthalic acid Terephthalic acid Benzoic acid |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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Isophthalic acid, or benzene-1,3-dicarboxylic acid, is an aromatic dicarboxylic acid, with formula C6H4(COOH)2.
It is an isomer of phthalic acid and terephthalic acid.
Isophthalic acid can be obtained by oxidizing meta-xylene with chromic acid, or by fusing potassium meta-sulphobenzoate, or meta-brombenzoate with potassium formate (terephthalic acid is also formed in the last case). It melts above 300°. The barium salt (6H2O) is very soluble (a distinction between phthalic and terephthalic acids). Uvitic acid, 5-methylisophthalic acid, is obtained by oxidizing mesitylene or by condensing pyroracemic acid with baryta water.
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