Butadiene
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| Names | |||
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| Preferred IUPAC name
Buta-1,3-diene | |||
Other names
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| Identifiers | |||
3D model (JSmol) |
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| 605258 | |||
| ChEBI | |||
| ChEMBL | |||
| ChemSpider | |||
| ECHA InfoCard | 100.003.138 | ||
| EC Number |
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| 25198 | |||
| KEGG | |||
PubChem CID |
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| RTECS number |
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| UNII | |||
| UN number | 1010 | ||
CompTox Dashboard (EPA) |
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| Properties | |||
| C4H6 CH2=CH-CH=CH2 | |||
| Molar mass | 54.0916 g/mol | ||
| Appearance | Colourless gas or refrigerated liquid | ||
| Odor | Mildly aromatic or gasoline-like | ||
| Density |
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| Melting point | −108.91 °C (−164.04 °F; 164.24 K) | ||
| Boiling point | −4.41 °C (24.06 °F; 268.74 K) | ||
| 1.3 g/L at 5 °C, 735 mg/L at 20 °C | |||
| Solubility | |||
| Vapor pressure | 2.4 atm (20 °C) | ||
Refractive index (nD) |
1.4292 | ||
| Viscosity | 0.25 cP at 0 °C | ||
| Hazards | |||
| Occupational safety and health (OHS/OSH): | |||
Main hazards |
Flammable, irritative, carcinogen | ||
| GHS labelling: | |||
| Danger | |||
| H220, H280, H340, H350 | |||
| P202, P210, P280, P308+P313, P377, P381, P403 | |||
| NFPA 704 (fire diamond) | |||
| Flash point | −85 °C (−121 °F; 188 K) liquid flash point | ||
| 414 °C (777 °F; 687 K) | |||
| Explosive limits | 2–12% | ||
| Lethal dose or concentration (LD, LC): | |||
LD50 (median dose) |
548 mg/kg (rat, oral) | ||
LC50 (median concentration) |
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LCLo (lowest published) |
250,000 ppm (rabbit, 30 min) | ||
| NIOSH (US health exposure limits): | |||
PEL (Permissible) |
TWA 1 ppm ST 5 ppm | ||
REL (Recommended) |
Potential occupational carcinogen | ||
IDLH (Immediate danger) |
2000 ppm | ||
| Safety data sheet (SDS) | ECSC 0017 | ||
| Related compounds | |||
| Isoprene Chloroprene | |||
Related compounds |
Butane | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |||
1,3-Butadiene (/ˌbjuːtəˈdaɪiːn/) is the 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.
Although butadiene breaks down quickly in the atmosphere, it is nevertheless found in ambient air in urban and suburban areas as a consequence of its constant emission from 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.
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