2-Pentyne

2-Pentyne, an organic compound, is an internal alkyne. It is an isomer of 1-pentyne, a terminal alkyne.

1-Pentyne
2-Pentyne
Names
IUPAC name
Pent-2-yne
Other names
Ethylmethylacetylene, 1-Ethyl-2-methylacetylene propyl acetylene
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.009.991
UNII
Properties
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
Main hazards Flammable Liquid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Synthesis

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

References
  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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