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Information @ a Glance

  • Benzidine is a synthetic chemical that does not occur naturally. It is a crystalline (sandy or sugar-like) solid that may be grayish-yellow, white, or reddish-gray in color.

  • Benzidine, the trivial name for 4,4'-diaminobiphenyl, is the solid organic compound with the formula (C6H4NH2)2. This aromatic amine is a component of a test for cyanide and also in the production of dyes.

  • Benzidine and its congeners constitute a family of similar synthetic aromatic amines which are important precursors in the synthesis of dyes. Some of these dyes have the potential to metabolize to aromatic amines that are considered to be carcinogenic.

  • In the past, industry used large amounts of benzidine to produce dyes for cloth, paper, and leather. However, it has not been manufactured for sale in the United States since the mid-1970s.

  • Benzidine also has other names, such as 4,4'-diphenylenediamine or Fast Corinth Base B (a registered trade name).

  • Benzidine and the substituted benzidines find vide applications as an intermediate in the dyestuff industries and are largely used in the synthesis of azo dyes.

  • Benzidine is prepared in a two step process from nitrobenzene. First, the nitrobenzene is converted to 1,2-diphenylhydrazine, usually using iron powder as the reducing agent. Treatment of this hydrazine with mineral acids induces a rearrangement reaction to 4,4'-benzidine. Smaller amounts of other isomers are also formed. The benzidine rearrangement, which proceeds intramolecularly, is a classic mechanistic puzzle in organic chemistry.

  • 4,4-Diamino-1,1-biphenyl (benzidine) 1 is a well known compound, which has been widely used in the past in different areas of science. Molecules of this class were employed for a long time asprimary materials in the manufacture of azodyes.

  • Benzidines also play an important role in cell biology and clinical work as valuable staining reagents. Due to its potential risks, research has been carried out to develop analogues for biological and medical purpose.

  • Benzidine - based dyes are largely classified as direct dyes, since they may be applied directly to fabrics or other substrates without pre-treatment or without subsequent processes that firmly attach the dye to the substrate.

  • The majority of the dye works in Hong Kong buy their dyes from Asian dye manufacturers, primarily from China, Taiwan, India, Thailand and Southern Korea. The main reason is the price differential between Western and Asian dyes where the latter is approximately half - price.

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