2-Methylimidazole CAS 693-98-1

Physical Properties

Appearance

White, beige or light yellow crystals or powder

Hygroscopicity

Hygroscopic

Melting Point

142 - 145°C

Boiling Point

267°C (at 1.013 hPa)

Density

1.096 g/cm³ (at 20°C)

Flash Point

155°C

Water Solubility

High, 267 g/L soluble at 20°C

Solubility

Soluble in polar solvents such as ethanol and acetone; slightly soluble in

cold benzene and non-polar solvents

Stability

May decompose at high temperatures, releasing toxic gases such as nitrogen oxides and 

hydrogen cyanide

Chemical Properties

Acidity & Alkalinity

Nitrogen-containing heterocyclic compound with strong alkalinity
pH of 10% aqueous solution: 10.5 - 11.5

Chemical Reactions

1. Neutralizes with acids to form salts (e.g., reacts with hydrochloric acid to

form 2-methylimidazole hydrochloride)
2. Forms coordination complexes with metal ions (e.g., iron, silver)

High-Temperature Reactivity

May decompose at high temperatures, releasing toxic gases such as 

nitrogen oxides and hydrogen cyanide