Benzimidazole

CAS Number
51-17-2
EC Number
200-081-4

What is Benzimidazole?

Benzimidazole (CAS 51-17-2), also known as 1,3-Benzodiazole, is a bicyclic heterocyclic compound used in pharmaceutical synthesis, agrochemical manufacturing, and industrial preservation.

Where is Benzimidazole used?

  • Pharmaceutical manufacturing: core scaffold
  • Synthesis of antiparasitic, antifungal, and proton pump inhibitor drug intermediates
  • Agrochemical production: precursor in the synthesis of fungicides and pesticides
  • Water treatment: biocide formulations controlling microbial growth in industrial cooling systems and process water
  • Biotechnology and research: ligands in catalytic systems and reference compounds in assay development and specialized chemical analysis
  • It functions as a building block for active ingredients and as a ligand or catalyst precursor in chemical production processes.

Commercial specifications

  • Technical grade for industrial synthesis; higher-purity grades for pharmaceutical intermediate specifications
  • Packaging from kilogram quantities up to bulk drum supply

Other Names (Synonyms)

1H-Benzimidazole|1,3-Benzodiazole|3-Azaindole|o-Benzimidazole|Azindole

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What are the physical properties of Benzimidazole?

Melting Point 170.5 °C
Boiling Point >360 °C
Density 1.227 g/cm³
Flash Point 360°C
Appearance white crystals
Color Beige to brown
Form Crystalline Powder or Crystals
Water Solubility sparingly soluble
Refractive Index 1.5500 (estimate)
Log P 1.320

How is Benzimidazole classified and handled safely? Learn More

Warning
GHS07· Irritant

Hazard Statements

H302 Harmful if swallowed

Precautionary Statements

P264 Wash … thoroughly after handling.
P270 Do not eat, drink or smoke when using this product.
P330 Rinse mouth.
P501 Dispose of contents/container in accordance with local regulations.
P301+P317 Get emergency medical help.

Which trade and regulatory codes apply to Benzimidazole?

HS Code 29339990
Storage Class 11 - Combustible Solids
WGK (Germany) 3
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