Benzene‑1,2‑diamine

Benzene‑1,2‑diamine

CAS Number:95‑54‑5

Synonyms:o‑Phenylenediamine; 1,2‑Diaminobenzene; Orthamine; OPD

Chemical Formula:C₆H₈N₂

Product Introduction

o‑Phenylenediamine is a white solid (yellowing on air exposure) with two ortho‑amine groups on a benzene ring. It reacts readily in heterocyclic syntheses and is used in dyes, pharmaceuticals, and polymer curing. Highly toxic, carcinogenic, and aquatic-hazardous

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Physical & Chemical Properties

Property Value
Appearance White to off-white flaked/solid (darkens in air)
Purity ≥ 99 % (GC) per suppliers
Density 1.031 g/cm³
Melting Point 102–104 °C
Boiling Point ~252 °C
Flash Point ~156 °C
Solubility Soluble in hot water; soluble in alcohols and ketones
Molecular Weight 108.14 g/mol
pKa 4.57 (conj. acid), 0.80 (diprotonated)

Applications

  • Heterocycle synthesis: Used to prepare benzimidazoles, quinoxalines, benzodiazepines via condensation reactions.
  • Dye & pigment intermediates: Precursor for azo dyes, polymer stabilizers, pigments.
  • Pharma & agrochem: Intermediate for fungicides, pharmaceuticals, corrosion inhibitors.
  • Analytical reagent: Employed in fluorescence assays and chromatography.

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