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Topic summary

Butadiene

Butadiene
Names Preferred IUPAC name
Buta-1,3-diene
Other names
  • Biethylene
  • Erythrene
  • Divinyl
  • Vinylethylene
  • Bivinyl
  • Butadiene
Identifiers
3D model (JSmol)
605258 ChEBI
ChEMBL
ChemSpider
ECHA InfoCard100.003.138EC Number
  • 203-450-8
25198 KEGG
RTECS number
  • EI9275000
UNII
UN number1010
  • InChI=1S/C4H6/c1-3-4-2/h3-4H,1-2H2
    Key: KAKZBPTYRLMSJV-UHFFFAOYSA-N
  • InChI=1/C4H6/c1-3-4-2/h3-4H,1-2H2
    Key: KAKZBPTYRLMSJV-UHFFFAOYAZ
  • C=CC=C
Properties C4H6
CH2=CH-CH=CH2Molar mass54.0916 g/mol Appearance Colourless gas
or refrigerated liquid OdorMildly aromatic or gasoline-like Density
  • 0.6149g/cm at 25 °C, p>1 atm
  • 0.64g/cm at −6 °C, liquid
Melting point−108.91 °C (−164.04 °F; 164.24 K) Boiling point−4.41 °C (24.06 °F; 268.74 K) 1.3g/L at 5°C, 735mg/L at 20°C Solubility
Vapor pressure2.4atm (20°C) 1.4292 Viscosity0.25cP at 0 °C Hazards Occupational safety and health (OHS/OSH):
Main hazards
Flammable, irritative, carcinogenGHS labelling: DangerH220, H340, H350P202, P210, P280, P308+P313, P377, P381, P403NFPA 704 (fire diamond)
3
4
2
Flash point−85 °C (−121 °F; 188 K) liquid flash point 414 °C (777 °F; 687 K) Explosive limits2–12% Lethal dose or concentration (LD, LC): 548mg/kg (rat, oral)
  • 115,111ppm (mouse)
  • 122,000ppm (mouse, 2h)
  • 126,667ppm (rat, 4h)
  • 130,000ppm (rat, 4h)
250,000ppm (rabbit, 30min) NIOSH (US health exposure limits):
PEL (Permissible)
TWA 1ppm ST 5ppm
REL (Recommended)
Potential occupational carcinogen
IDLH (Immediate danger)
2000ppm Safety data sheet (SDS) ECSC 0017Related compounds
Related Alkenes
and dienes
Isoprene
Chloroprene
Related compounds
ButaneSupplementary data page Butadiene (data page)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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1,3-Butadiene () is an organic compound with the formula CH2=CH-CH=CH2. It is a colorless gas that is easily condensed to a liquid. It is important industrially as a precursor to synthetic rubber. The molecule can be viewed as the union of two vinyl groups. It is the simplest conjugated diene.

Butadiene undergoes chemical degradation in the atmosphere, but it can nevertheless be found in low levels in the air of urban and suburban areas due to emission by motor vehicles.

The name butadiene can also refer to the isomer, 1,2-butadiene, which is a cumulated diene with structure H2C=C=CH−CH3. This allene has no industrial significance.

Wikipedia source