2-Pentyne

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2-Pentyne


IUPAC name Pent-2-yne
Other names Ethylmethylacetylene, 1-Ethyl-2-methylacetylene
Identifiers
CAS number	627-21-4^N
PubChem	12310
ChemSpider	11807^Y
Jmol-3D images	Image 1 Image 2
SMILES CC#CCC C(#CCC)C
InChI InChI=1S/C5H8/c1-3-5-4-2/h3H2,1-2H3^Y Key: NKTDTMONXHODTI-UHFFFAOYSA-N^Y InChI=1/C5H8/c1-3-5-4-2/h3H2,1-2H3
Properties
Molecular formula	C₅H₈
Molar mass	68.12
Density	0.71 g/mL
Melting point	−109 °C
Boiling point	56 to 57 °C
Hazards
Main hazards	Flammable Liquid
N (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

2-Pentyne, an organic compound, 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.^[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.

v t e Alkynes

Ethyne ( C 2H 2 ) Propyne ( C 3H 4 ) Butyne ( C 4H 6 ) Pentyne ( C 5H 8 ) 3-Hexyne ( C 6H 10 ) Heptyne ( C 7H 12 ) Octyne ( C 8H 14 ) Nonyne ( C 9H 16 ) Decyne ( C 10H 18 ) Undecyne ( C 11H 20 )

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