Propyne
| Names | |
|---|---|
| Preferred IUPAC name
Propyne | |
| Other names
Methylacetylene Methyl acetylene Allylyne | |
| Identifiers | |
3D model (JSmol) |
|
| 878138 | |
| ChEBI | |
| ChEMBL | |
| ChemSpider | |
| ECHA InfoCard | 100.000.754 |
| EC Number |
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| MeSH | C022030 |
PubChem CID |
|
| UNII | |
CompTox Dashboard (EPA) |
|
| |
| |
| Properties | |
| CH3C≡CH | |
| Molar mass | 40.0639 g/mol |
| Appearance | Colorless gas |
| Odor | Sweet |
| Density | 0.53 g/cm3 |
| Melting point | −102.7 °C (−152.9 °F; 170.5 K) |
| Boiling point | −23.2 °C (−9.8 °F; 250.0 K) |
| Vapor pressure | 5.2 atm (20°C) |
| Hazards | |
| Explosive limits | 1.7%-? |
| NIOSH (US health exposure limits): | |
PEL (Permissible) |
TWA 1000 ppm (1650 mg/m3) |
REL (Recommended) |
TWA 1000 ppm (1650 mg/m3) |
IDLH (Immediate danger) |
1700 ppm |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
Propyne (methylacetylene) is an alkyne with the chemical formula CH3C≡CH. It is a component of MAPD gas—along with its isomer propadiene (allene), which was commonly used in gas welding. Unlike acetylene, propyne can be safely condensed.