Benzidine
Pharmaceutical Materials 2025-03-02
CAS Number: 92-87-5
Molecular Formula: C12H12N2
Molecular Weight: 184.24
Appearance: Yellowish, white, or reddish-gray crystalline powder
Melting Point: 125°C
Usage: Used in the manufacture of dyes, especially Congo red, and to detect blood stains and cyanide.
Hazard: Known to be a human carcinogen.
| Attribute | Details |
|---|---|
| Name | Benzidine |
| CAS Number | 92-87-5 |
| Synonyms | 4.4′-Diaminobiphenyl; p-Diaminodiphenyl; p,p’-Diaminodiphenyl |
| Molecular Formula | C12H12N2 |
| Molecular Weight | 184.24 g/mol |
| Appearance | White or slightly reddish crystalline powder |
| Melting Point | 128°C (some sources indicate 125°C) |
| Boiling Point | 402°C |
| Density | 1.250 g/cm³ (at 20/4°C) |
| Solubility | Slightly soluble in water (<0.1 g/100 mL at 22°C); soluble in boiling ethanol, acetic acid, and diluted hydrochloric acid; slightly soluble in ether; insoluble in cold water |
| Chemical Properties | Aromatic amine with significant alkalinity; reacts with acids to form salts; undergoes azo coupling reactions and diazotization; sensitive to air and light, which may cause color darkening. |
| Primary Uses | Important dye intermediate; used in the synthesis of azo dyes, pigments, and other organic compounds; also used in the production of certain pharmaceuticals and fine chemicals. |
| Safety Hazards | Classified as a carcinogenic substance by the World Health Organization; may cause skin and respiratory irritation; toxic via ingestion, inhalation, or skin absorption; long-term exposure may lead to bladder cancer and other health issues. |
| Storage Conditions | Store in a cool, dry, well-ventilated place; keep away from incompatible materials, ignition sources, and excessive heat; handle with appropriate personal protective equipment. |
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