1-Methyl-1H-benzimidazole

  • 1-Methylbenzimidazole
  • N-Methylbenzimidazole
  • 3-Methylbenzimidazole
  • NSC 42115
Formula
C8H8N2
Structure

Registry Numbers and Inventories.
CAS
1632-83-3
22 37/38 41
26 36/39
Beilstein Reference
5-23-06-00215

Properties.
Formula
C8H8N2
Formula mass
132.16
Melting point, °C
59 - 62
Boiling point, °C
285
Vapor pressure, mmHg
0.02 (25 C)
Density
1.11 g/cm3 (25 C)
Solubility in water
2.1 g/L (25 C)
pKa/pKb
8.22 (pKb)
Partition coefficient, pKow
1.376
Heat of vaporization
49.28 kJ/mol

Hazards and Protection.
Storage
Keep containers tightly closed.
Protection
Compatible chemical-resistant gloves. Chemical safety goggles. Protective clothing.
Respirators
Use respirators and components tested and approved under appropriate government standards such as NIOSH (US) or CEN (EU). Where risk assessment shows air-purifying respirators are appropriate use a full-face particle respirator type N99 (US) or type P2 (EN 143) respirator cartridges as a backup to engineering controls. If the respirator is the sole means of protection, use a full-face supplied air respirator.
Small spills/leaks
Sweep up, place in a bag and hold for waste disposal. Avoid raising dust. Ventilate area and wash spill site after material pickup is complete.
Stability
Stable at normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents.
Decomposition
Oxides of carbon, oxides of nitrogen.

Fire.
Flash Point,°C
108
Fire fighting
Extinguish with water spray, carbon dioxide, dry chemical powder or appropriate foam. Wear self-contained breathing apparatus and protective clothing to prevent contact with skin and eyes.
Hazards
Emits toxic fumes under fire conditions.
Health
2
 
Flammability
0
 
 
Reactivity
0
 

Health.
Exposure effects
   Ingestion
Harmful if swallowed.
   Inhalation
May be harmful if inhaled. Material is irritating to mucous membranes and upper respiratory tract.
   Skin
Causes skin irritation. May be harmful if absorbed through the skin.
   Eyes
Causes severe eye irritation.

First aid
 
   Ingestion
If swallowed, wash out mouth with water provided person is conscious. Call a physician.
   Inhalation
If inhaled, remove to fresh air. If not breathing give artificial respiration. If breathing is difficult, give oxygen.
   Skin
In case of contact, immediately wash skin with soap and copious amounts of water. Remove contaminated clothing and shoes. Call a physician.
   Eyes
In case of contact with eyes, flush with copious amounts of water for at least 15 minutes. Assure adequate flushing by separating the eyelids with fingers. Call a physician.

Transport.