3,3′-Dimethylbenzidine in Pakistan
3,3′-Dimethylbenzidine (o-tolidine, CAS 119-93-7) is an aromatic amine used as an intermediate for manufacturing dyes, pigments, and curing agents for urethane resins.
Description
Key Aspects of 3,3′-Dimethylbenzidine
- Alternative Names: o-Tolidine, ortho-tolidine, 4,4′-Bi-o-toluidine.
- Structure: It is a biphenyl compound with two amino groups at 4,4′-positions and two methyl groups at 3,3′-positions.
- Uses: Primarily used to produce soluble azo dyes and insoluble pigments for textiles, leather, and paper. It is also used as a laboratory reagent to detect chlorine, blood, and gold.
- Health Hazards: Exposure (inhalation, ingestion, skin contact) can irritate the nose and throat. It is a confirmed carcinogen based on animal studies (liver, skin, lung, intestine, and other organs).
- Physical Properties: Solid, white to reddish, or light tan powder. Sparingly soluble in water but soluble in alcohol and ether.
- Chemical Reactions: Turns violet over time. Forms an intense blue color upon exposure to chlorine or bromine vapors.
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