2,4,4-Trimethyl-2-pentene

  • Diisobutene
  • Diisobutylene
  • 2,4,4-Trimethylpent-2-ene
Formula
C8H16
Structure
Description
Clear, colorless liquid with distinctive turpentine-like odor.
Uses
Organic synthesis.

Registry Numbers and Inventories.
CAS
107-40-4
EC (EINECS/ELINCS)
203-488-5
S: 16, 9, 29, 33
UN (DOT)
2050
Beilstein/Gmelin
1719492
Beilstein Reference
4-01-00-00891
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C8H16
Formula mass
112.22
Melting point, °C
-106.3
Boiling point, °C
104
Vapor pressure, mmHg
35 (25 C)
Vapor density (air=1)
3.8
Critical temperature
282
Critical pressure
26.4
Density
0.7223 g/cm3 (20 C)
Solubility in water
Insoluble
Viscosity
2.7903 pa.s @ 166.84 K
Surface tension
33.078 g/s2 @ 166.8 K
Refractive index
1.4160 (20 C)
Partition coefficient, pKow
4.14
Heat of fusion
6.8 kJ/mol
Heat of vaporization
33.0 kJ/mol

Hazards and Protection.
Storage
Keep away from sources of ignition. Store in a cool, dry place. Store in a tightly closed container. Flammables-area.
A B1 D2B
Handling
Use spark-proof tools and explosion proof equipment. Avoid breathing dust, vapor, mist, or gas. Avoid contact with skin and eyes.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
For unignited small spill absorb material with vermiculite, absorbent pads, etc. Place in a sealed container for later disposal. For large spill Dike far ahead of liquid spills to contain for later disposal. Keep runoff from entering sewers and/or ditches that lead to waterways. Apply a blanket of vapor suppressing hazardous materials foam or aqueous film forming foam to the spill surface to minimize fire potential.
Stability
No data.
Incompatibilities
Oxidizing agents.
Decomposition
Carbon monoxide, carbon dioxide.

Fire.
Flash Point,°C
-5
Autoignition, °C
308
Upper exp. limit, %
6.4
Lower exp. limit, %
0.9
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Will burn if involved in a fire. Extinguishing media: Use water spray to cool fire-exposed containers. Use foam, dry chemical, or carbon dioxide.
Fire potential
Highly flammable, dangerous fire risk.
Hazards
Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.
Health
2
 
Flammability
3
 
 
Reactivity
0
 

Health.
Exposure effects
Chronic effects may cause dermatitis from skin contact.
   Ingestion
Ingestion may cause nausea, vomiting, and irritation to the digestive tract.
   Inhalation
Inhalation of vapors may cause irritation to the respiratory tract and to other mucous membranes. Inhalation may cause nausea and headache. High concentrations may result in narcosis and/or unconsciousness.
   Skin
May cause skin irritation.
   Eyes
May cause eye irritation.

First aid
 
   Ingestion
Get medical aid. Wash mouth out with water.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
2050
Response guide
Hazard class
3
Packing Group
II
 
USCG CHRIS Code
OTX
 
IMO Chemical Code
17
IMO Pollution Category
B
IMO Hazard code
P