Crotonylene

  • 2-Butyne
  • But-2-yne
  • Dimethylacetylene
Formula
H6CCCCH3
Structure
Description
A clear colorless liquid with a petroleum-like odor.

Registry Numbers and Inventories.
CAS
503-17-3
EC (EINECS/ELINCS)
207-962-2
R 12 36/37
S 9 16 23 29 36
UN (DOT)
1144
Beilstein/Gmelin
1361340
Beilstein Reference
4-01-00-00971
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C4H6
Formula mass
54.09
Melting point, °C
-32
Boiling point, °C
27
Vapor pressure, mmHg
254 (0 C)
Critical temperature
214
Critical pressure
4.84
Density
0.6913 g/cm3 (20C)
Solubility in water
Soluble
Refractive index
1.3921 (20 C)
Dipole moment
3.95 D
Partition coefficient, pKow
1.46
Heat of fusion
9.2 kJ/mol
Heat of vaporization
26.6 kJ/mol
Heat of combustion
-2580 kJ/mol

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
Handling
Handle in accordance with all current regulations and standards.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Attempt to stop leak if without undue personnel hazard. Use water spray to knock-down vapors.
Stability
Stable.
Incompatibilities
May react vigorously with strong oxidizing agents May react exothermically with reducing agents to release hydrogen gas.
Decomposition
Oxides of carbon.

Fire.
Flash Point,°C
-49
Upper exp. limit, %
41.8
Lower exp. limit, %
2
Fire fighting
Do not extinguish fire unless flow can be stopped. Use water in flooding quantities as fog. Solid streams of water may spread fire. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible. Use foam, dry chemical, or carbon dioxide.
Fire potential
HIGHLY FLAMMABLE.
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. May polymerize explosively when heated or involved in a fire. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water. Substance may be transported hot.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.
Health
1
 
Flammability
4
 
 
Reactivity
3
 

Health.
Exposure effects
The toxological properties of this substance have not been fully investigated.
   Inhalation
Vapors may cause dizziness or suffocation. May cause irritation or burns.
   Skin
May cause irritation or burns.
   Eyes
See Skin.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Administer oxygen if breathing is difficult.
   Skin
Remove and isolate contaminated clothing and shoes. Wash skin with soap and water. Flush with running water for at least 20 minutes
   Eyes
Flush with running water for at least 20 minutes.

Transport.
UN number
1144
Response guide
Hazard class
3
Packing Group
I
 
Std. Transport #
4909138