2-Aminopentanoic Acid

(benzene-1,2-dicarboxylic acid) Is an aromatic dicarboxylic acid, with formula C6H4(COOH)2. It is an isomer of isophthalic acid and terephthalic acid.

Phenylenediamines gives substituted quinoxal-2-ones. The structure of one of the products has been proved using x-ray analysis.

Dicarboxylic acids are organic compounds that are substituted with two carboxylic acid functional groups. In molecular formulae for dicarboxylic acids, these groups are often written as HOOC-R-COOH, where r is usually an alkyl, alkenyl, or akynyl group.

Benzilic acid is a white crystalline aromatic acid soluble in many primary alcohols. It can be prepared by heating mixture of benzil, alcohol and potassium hydroxide.

Benzoic acid, C₇H₆O₂ (or C₆H₅COOH), is a colorless crystalline solid and the simplest aromatic carboxylic acid.

Isophthalic acid is an organic compound with the formula C6H4(CO2H)2. This colourless solid is an isomer of phthalic acid and terephthalic acid.