2-Pentyne
Skeletal formula of 2-pentyne
Ball-and-stick model of 2-pentyne
Names
Preferred 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
  • InChI=1S/C5H8/c1-3-5-4-2/h3H2,1-2H3 checkY
    Key: NKTDTMONXHODTI-UHFFFAOYSA-N checkY
  • InChI=1/C5H8/c1-3-5-4-2/h3H2,1-2H3
  • CC#CCC
  • C(#CCC)C
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
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).
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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]

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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