B

Benzimidazole

IUPAC: 1H-benzimidazole

C7H6N2 Organic Compounds CAS 51-17-2
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Quick Reference
Formula / NotationC7H6N2
CAS Number51-17-2
Molecular Weight118.14
Melting Point338 to 342 °F (NTP, 1992)
Boiling Pointgreater than 680 °F at 760 mmHg (NTP, 1992)
Solubilityless than 1 mg/mL at 63 °F (NTP, 1992)
AppearanceBenzimidazole appears as white tabular crystals. (NTP, 1992)
Also Known As1H-benzimidazole; 51-17-2; 1H-Benzimidazole; Benzoimidazole; 1,3-Benzodiazole; 3-Azaindole; Benziminazole; o-Benzimidazole; Benzoglyoxaline; Azindole
CategoryOrganic Compounds

What is Benzimidazole?

1H-benzimidazole is the 1H-tautomer of benzimidazole. It is a benzimidazole and a polycyclic heteroarene. It is a conjugate acid of a benzimidazolide. It is a tautomer of a 4H-benzimidazole, a 2H-benzimidazole and a 3aH-benzimidazole.

Formula & Notation

C7H6N2

IUPAC Name: 1H-benzimidazole

Other Names / Synonyms: 1H-benzimidazole; 51-17-2; 1H-Benzimidazole; Benzoimidazole; 1,3-Benzodiazole; 3-Azaindole; Benziminazole; o-Benzimidazole; Benzoglyoxaline; Azindole

Properties & Characteristics

Appearance: Benzimidazole appears as white tabular crystals. (NTP, 1992). Molecular formula: C7H6N2. Molecular weight: 118.14 g/mol. Boiling point: greater than 680 °F at 760 mmHg (NTP, 1992). Melting point: 338 to 342 °F (NTP, 1992). Solubility: less than 1 mg/mL at 63 °F (NTP, 1992). Vapor pressure: 0.0000764 [mmHg]. LogP: 1.3.

Physical Data

PropertyValue
Melting Point338 to 342 °F (NTP, 1992)
Boiling Pointgreater than 680 °F at 760 mmHg (NTP, 1992)
Molecular Weight118.14
Solubilityless than 1 mg/mL at 63 °F (NTP, 1992)
AppearanceBenzimidazole appears as white tabular crystals. (NTP, 1992)

Uses & Applications

Used as an industrial feedstock, solvent, pharmaceutical intermediate, flavoring agent, or chemical building block.

Safety Information

Flammable or irritant. Many organic compounds are flammable liquids or vapours. Keep away from ignition sources. Consult SDS for specific hazard data.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Benzimidazole
Formula C7H6N2
CAS Number 51-17-2
Molecular Weight 118.14
Synonyms 1H-benzimidazole; 51-17-2; 1H-Benzimidazole; Benzoimidazole; 1,3-Benzodiazole; 3-Azaindole; Benziminazole; o-Benzimidazole; Benzoglyoxaline; Azindole

Frequently Asked Questions

1H-benzimidazole is the 1H-tautomer of benzimidazole. It is a benzimidazole and a polycyclic heteroarene. It is a conjugate acid of a benzimidazolide. It is a tautomer of a 4H-benzimidazole, a 2H-benzimidazole and a 3aH-benzimidazole.

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Editorial standards: Chemical data is sourced from peer-reviewed literature, CAS Registry, NIST WebBook, and PubChem. Safety information reflects guidance from OSHA, ECHA, and IAEA. For educational purposes only — always consult official SDS documentation and qualified professionals before handling chemicals.