Phthalic acids

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Phthalic acids, also known as benzene dicarboxylic acids, are organic acids with the chemical formula C₆H₄(COOH)₂. There are three isomers: ortho- or phthalic acid (1,2-benzenedicarboxylic acid); meta- or isophthalic acid (1,3-benzenedicarboxylic acid); para- or terephthalic acid (1,4-benzenedicarboxylic acid). Their chemical structures are shown here.

Image:Phthalic acid isomers.PNG

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