2-Pentyne

2-Pentyne
Names
	Preferred IUPAC name Pent-2-yne
	Other names Ethylmethylacetylene, 1-Ethyl-2-methylacetylene propyl acetylene
Identifiers
CAS Number	627-21-4 ;
3D model (JSmol)	Interactive image; Interactive image;
ChemSpider	11807 ;
ECHA InfoCard	100.009.991
PubChem CID	12310;
UNII	57NG6HKI9D ;
CompTox Dashboard (EPA)	DTXSID80211758 ;
	InChI InChI=1S/C5H8/c1-3-5-4-2/h3H2,1-2H3 Key: NKTDTMONXHODTI-UHFFFAOYSA-N ; InChI=1/C5H8/c1-3-5-4-2/h3H2,1-2H3;
	SMILES CC#CCC; C(#CCC)C;
Properties
Chemical formula	C5H8
Molar mass	68.12
Density	0.71 g/mL
Melting point	−109 °C (−164 °F; 164 K)
Boiling point	56 to 57 °C
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Flammable Liquid
	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

2-Pentyne, an organic compound with the formula CH₃CH₂C≡CCH₃ and is an internal alkyne. It is an isomer of 1-pentyne, a terminal alkyne.

1-Pentyne

Synthesis

2-Pentyne can be synthesized by the rearrangement 1-pentyne in a solution of ethanolic potassium hydroxide or NaNH2/NH3.^[1]

^ Victor von Richter and Hans Meerwein (1916). Organic Chemistry: Chemistry of the aliphatic series Vol. I: Smith's 3rd American Ed. Philadelphia: P. Blakiston's Sons & Co. p. 89.

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