I

Imidazole

IUPAC: 1H-imidazole

C3H4N2 Organic Compounds CAS 288-32-4
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Quick Reference
Formula / NotationC3H4N2
CAS Number288-32-4
Molecular Weight68.08
Melting Point90.5 °C
Boiling Point257 °C
DensityDensity: 1.0303 g/cu m at 101 °C
SolubilityVery soluble in water
AppearanceLiquid, Other Solid
Also Known As1H-imidazole; 1H-Imidazole; 288-32-4; Glyoxaline; Imidazol; Iminazole; Miazole; 1,3-Diazole; Imutex; Glyoxalin
CategoryOrganic Compounds

What is Imidazole?

1H-imidazole is an imidazole tautomer which has the migrating hydrogen at position 1. It is a conjugate base of an imidazolium cation. It is a conjugate acid of an imidazolide. It is a tautomer of a 4H-imidazole.

Formula & Notation

C3H4N2

IUPAC Name: 1H-imidazole

Other Names / Synonyms: 1H-imidazole; 1H-Imidazole; 288-32-4; Glyoxaline; Imidazol; Iminazole; Miazole; 1,3-Diazole; Imutex; Glyoxalin

Properties & Characteristics

Appearance: Liquid, Other Solid. Molecular formula: C3H4N2. Molecular weight: 68.08 g/mol. Boiling point: 257 °C. Melting point: 90.5 °C. Density: Density: 1.0303 g/cu m at 101 °C. Solubility: Very soluble in water. Vapor pressure: 0.002 [mmHg]. LogP: -0.1.

Physical Data

PropertyValue
Melting Point90.5 °C
Boiling Point257 °C
DensityDensity: 1.0303 g/cu m at 101 °C
Molecular Weight68.08
SolubilityVery soluble in water
AppearanceLiquid, Other Solid

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 Imidazole
Formula C3H4N2
CAS Number 288-32-4
Molecular Weight 68.08
Synonyms 1H-imidazole; 1H-Imidazole; 288-32-4; Glyoxaline; Imidazol; Iminazole; Miazole; 1,3-Diazole; Imutex; Glyoxalin

Frequently Asked Questions

1H-imidazole is an imidazole tautomer which has the migrating hydrogen at position 1. It is a conjugate base of an imidazolium cation. It is a conjugate acid of an imidazolide. It is a tautomer of a 4H-imidazole.

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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.