Isophthalic acid
Other names	Benzene-1,3-dicarboxylic acid meta-Phthalic acid
Identifiers
CAS number	[121-91-5]
SMILES	C1=CC(=CC(=C1)C(=O)O)C(=O)O
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 references

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.

References

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External links

• International Chemical Safety Card 0500

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