Editing Propyne (section)

{{Short description|Hydrocarbon compound (HC≡C–CH3)}}
{{distinguish|propane|propene}}
{{chembox
| Verifiedfields = changed
| verifiedrevid  = 406858995
| Name           = Propyne
| ImageFile      = PROPYNE.png
| ImageSize      = 120px
| ImageName      = Methylacetylene
| ImageFile1     = Propyne-3D-vdW.png
| ImageSize1     = 180px
| PIN            = Propyne<ref name=iupac2013>{{cite book | title = Nomenclature of Organic Chemistry. IUPAC Recommendations and Preferred Names 2013 (Blue Book) | chapter = Characteristic (Functional) and Substituent Groups | publisher = [[Royal Society of Chemistry|The Royal Society of Chemistry]] | date = 2014 | location = Cambridge | page = 374 | doi = 10.1039/9781849733069-00372 | isbn = 978-0-85404-182-4}}</ref><ref group="note">"Prop-1-yne" mistake fixed in the [https://www.qmul.ac.uk/sbcs/iupac/bibliog/BBerrors.html errata] {{Webarchive|url=https://web.archive.org/web/20190801093648/https://www.qmul.ac.uk/sbcs/iupac/bibliog/BBerrors.html |date=2019-08-01 }}. The locant is omitted according to P-14.3.4.2&nbsp;(d), p.&nbsp;31 for propene and P-31.1.1.1, Examples, p.&nbsp;374 for propyne.</ref>
| SystematicName = 
| OtherNames     = Methylacetylene<br />Methyl acetylene<br />Allylyne
| IUPACName      = 
| Section1       = {{Chembox Identifiers
| CASNo = 74-99-7
| CASNo_Ref = {{cascite|correct|CAS}}
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = 086L40ET1B
| ChEMBL_Ref = {{ebicite|changed|EBI}}
| ChEMBL = 116902
| SMILES = CC#C
| EINECS = 200-828-4
| PubChem = 6335
| ChemSpiderID = 6095
| InChI = 1/C3H4/c1-3-2/h1H,2H3
| InChIKey = MWWATHDPGQKSAR-UHFFFAOYAI
| StdInChI = 1S/C3H4/c1-3-2/h1H,2H3
| StdInChIKey = MWWATHDPGQKSAR-UHFFFAOYSA-N
| RTECS = 
| MeSHName = C022030
| ChEBI = 48086
| ChEBI_Ref = {{ebicite|correct|ebi}}
| Beilstein = 878138
  }}
| Section2       = {{Chembox Properties
| Formula = {{chem2|CH3C\tCH}}
| MolarMass = 40.0639 g/mol
| Density = 0.53 g/cm<sup>3</sup>
| MeltingPtC = -102.7
| BoilingPtC = -23.2
| Appearance = Colorless gas<ref name=NIOSH/>
| Odor = Sweet<ref name=NIOSH/>
| VaporPressure = 5.2 [[Standard atmosphere (unit)|atm]] (20°C)<ref name=NIOSH/>
  }}
| Section3       = {{Chembox Hazards
| PEL = TWA 1000 ppm (1650 mg/m<sup>3</sup>)<ref name=NIOSH>{{PGCH|0392}}</ref>
| ExploLimits = 1.7%-?<ref name=NIOSH/>
| IDLH = 1700 ppm<ref name=NIOSH/>
| REL = TWA 1000 ppm (1650 mg/m<sup>3</sup>)<ref name=NIOSH/> 
}}
| Section4       = 
| Section5       = 
| Section6       = 
}}

'''Propyne''' ('''methylacetylene''') is an [[alkyne]] with the [[chemical formula]] {{chem2|CH3C\tCH}}.  It is a component of [[MAPP gas|MAPD gas]]—along with its [[isomer]] [[propadiene]] (allene), which was commonly used in [[gas welding]]. Unlike [[acetylene]], propyne can be safely [[Condensation|condensed]].<ref name=Ullmann>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}}).</ref>