Propyne

Propyne
Names
	Preferred IUPAC name Propyne
	Other names Methylacetylene; Methyl acetylene; Allylene
Identifiers
CAS Number	74-99-7 ;
3D model (JSmol)	Interactive image;
Beilstein Reference	878138
ChEBI	CHEBI:48086 ;
ChEMBL	ChEMBL116902 ;
ChemSpider	6095;
ECHA InfoCard	100.000.754
EC Number	200-828-4;
MeSH	C022030
PubChem CID	6335;
UNII	086L40ET1B ;
CompTox Dashboard (EPA)	DTXSID0026387 ;
	InChI InChI=1S/C3H4/c1-3-2/h1H,2H3 Key: MWWATHDPGQKSAR-UHFFFAOYSA-N; InChI=1/C3H4/c1-3-2/h1H,2H3 Key: MWWATHDPGQKSAR-UHFFFAOYAI;
	SMILES CC#C;
Properties
Chemical formula	C3H4
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). verify (what is ?) 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.^[3]

^ "Front Matter". Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 374. doi:10.1039/9781849733069-FP001. ISBN 978-0-85404-182-4.
^ ^a ^b ^c ^d ^e ^f ^g NIOSH Pocket Guide to Chemical Hazards. "#0392". National Institute for Occupational Safety and Health (NIOSH).
^ Peter Pässler, Werner Hefner, Klaus Buckl, Helmut Meinass, Andreas Meiswinkel, Hans-Jürgen Wernicke, Günter Ebersberg, Richard Müller, Jürgen Bässler, Hartmut Behringer, Dieter Mayer, "Acetylene" in Ullmann's Encyclopedia of Industrial Chemistry Wiley-VCH, Weinheim 2007 (doi:10.1002/14356007.a01_097.pub2).

Cite error: There are <ref group=note> tags on this page, but the references will not show without a {{reflist|group=note}} template (see the help page).

[iupac2013-1] "Front Matter". Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 374. doi:10.1039/9781849733069-FP001. ISBN 978-0-85404-182-4.

[NIOSH-3] ^ ^a ^b ^c ^d ^e ^f ^g NIOSH Pocket Guide to Chemical Hazards. "#0392". National Institute for Occupational Safety and Health (NIOSH).

[Ullmann-4] Peter Pässler, Werner Hefner, Klaus Buckl, Helmut Meinass, Andreas Meiswinkel, Hans-Jürgen Wernicke, Günter Ebersberg, Richard Müller, Jürgen Bässler, Hartmut Behringer, Dieter Mayer, "Acetylene" in Ullmann's Encyclopedia of Industrial Chemistry Wiley-VCH, Weinheim 2007 (doi:10.1002/14356007.a01_097.pub2).

[1]

[note 1]

[2]

[3]

Names


Preferred IUPAC name Propyne^[1]^{[note 1]}
Other names Methylacetylene Methyl acetylene Allylene
Identifiers
CAS Number	74-99-7^Y
3D model (JSmol)	Interactive image
Beilstein Reference	878138
ChEBI	CHEBI:48086^Y
ChEMBL	ChEMBL116902^N
ChemSpider	6095
ECHA InfoCard	100.000.754
EC Number	200-828-4
MeSH	C022030
PubChem CID	6335
UNII	086L40ET1B^Y
CompTox Dashboard (EPA)	DTXSID0026387
InChI InChI=1S/C3H4/c1-3-2/h1H,2H3 Key: MWWATHDPGQKSAR-UHFFFAOYSA-N InChI=1/C3H4/c1-3-2/h1H,2H3 Key: MWWATHDPGQKSAR-UHFFFAOYAI
SMILES CC#C
Properties
Chemical formula	C₃H₄
Molar mass	40.0639 g/mol
Appearance	Colorless gas^[2]
Odor	Sweet^[2]
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)^[2]
Hazards
Explosive limits	1.7%-?^[2]
NIOSH (US health exposure limits):
PEL (Permissible)	TWA 1000 ppm (1650 mg/m³)^[2]
REL (Recommended)	TWA 1000 ppm (1650 mg/m³)^[2]
IDLH (Immediate danger)	1700 ppm^[2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is ^YN ?) Infobox references