a-Humulene

  • a-Caryophyllene
  • 2,6,6,9-Tetramethyl-1,4,8-cycloundecatriene
  • 3,7,10-Humulatriene
Formula
C15H24
Structure
Uses
Component of hop oil and when oxidized may contribute to the hoppy aroma in beer.

Registry Numbers and Inventories.
CAS
6753-98-6
EC (EINECS/ELINCS)
229-816-7
36/37/38
RTECS
GZ4817500
RTECS class
Other
Merck
12,4789
Beilstein/Gmelin
3240075
Beilstein Reference
4-05-00-01171
Canada DSL/NDSL
NDSL
US TSCA
Listed
New Zealand
Listed

Properties.
Formula
C15H24
Formula mass
204.36
Boiling point, °C
276
Vapor pressure, mmHg
0.008 (25 C)
Density
0.8965 g/mL (20 C)
Solubility in water
Insoluble
Refractive index
1.5011 (25 C)
Heat of vaporization
49.4 kJ/mol

Hazards and Protection.
Storage
Keep tightly closed. Store in a cool dry place.
Protection
Rubber gloves. Chemical safety goggles.
Respirators
Government approved respirator.
Small spills/leaks
Cover with dry lime or soda ash, pick up, keep in a closed container, and hold for waste disposal. Ventilate area and wash spill site after material pickup is complete.
Incompatibilities
Strong oxidizing agents.
Decomposition
Carbon monoxide, Carbon dioxide.

Fire.
Flash Point,°C
110
Fire fighting
Extinguish using 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.
Exposure effects
Irritant. Irritating to eyes, respiratory system and skin.
   Skin
Causes skin irritation. Multiple Routes: May be harmful by inhalation, ingestion, or skin absorption. Vapor or mist is irritating to the eyes, mucous membranes, and upper respiratory tract.

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.
   Eyes
In case of contact, immediately flush eyes with copious amounts of water for at least 15 minutes.

Transport.