Benzimidazole

Benzimidazole (CAS No. 51-17-2) 

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1. Basic Information

IUPAC Name: 1H-BenzimidazoleSynonyms:BenziminazoleAzindoleCAS Number: 51-17-2Molecular Formula: C₇H₆N₂Molecular Weight: 118.14 g/molAppearance: White to off-white crystalline powderOdor: Slight aromatic odor

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2. Physical and Chemical Properties

Property	Value
Melting Point	170–172°C (338–342°F)
Boiling Point	>360°C (dec.)
Density	1.24 g/cm³ (20°C)
Solubility	– Water: Slightly soluble (1.7 g/L at 25°C)
	– Organic solvents: Soluble in ethanol, methanol, DMSO
pKa	5.53 (basic), 12.8 (acidic)
Refractive Index	1.600 (20°C)

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3. Chemical Structure

       N       // \\      C   C      |   |      C---N      \\ //       C=C

(Fused benzene and imidazole rings)

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4. Hazards (GHS Classification)

Health Hazards:Harmful if swallowed (H302)Causes skin irritation (H315)Causes serious eye irritation (H319)Environmental: Not classifiedNFPA Rating: Health 2, Flammability 1, Reactivity 0

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5. Storage and Handling

Storage:Keep in tightly sealed containersStore in a cool, dry, well-ventilated areaHandling:Use nitrile gloves and safety gogglesAvoid dust formation

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6. Applications

Pharmaceuticals:Core structure for anthelmintics (e.g., albendazole)Antifungal and antiviral agentsAgrochemicals:Fungicides (e.g., carbendazim)Industrial Uses:Corrosion inhibitorPolymer stabilizer

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