TCI C0255 4-Chloro-1,2-phenylenediamine is an aromatic ortho-diamine carrying a chlorine substituent on the ring. Its adjacent amino groups make it a classic precursor for condensation reactions that yield benzimidazoles with carboxylic acids or aldehydes, and quinoxalines with 1,2-dicarbonyl compounds. It is also used as an intermediate for dyes, as a diamine monomer, and in coordination chemistry studies. Aromatic diamines are toxic and air-sensitive, so handle the solid in a fume hood, store it cool, dark, and tightly closed, and follow the official TCI Safety Data Sheet.
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