2-Butyne

• But-2- in
• Dimethylacetylene

Liquid

0.69 g · cm -3 ( 20 ° C)

-32.2 ° C

27 ° C

770 hPa ( 20 ° C)

Practically insoluble in water

1.3921 (20 ° C)

Risk

119.1 kJ / mol

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2 -butyne is an unsaturated aliphatic hydrocarbon is selected from the homologous series of alkynes and isomeric with 1-butyne.

Production

2-yne is obtained by the reaction of propyne with methyl iodide.

Properties

It is a colorless at room temperature, volatile, flammable liquid. Due to the triple bond is 2-butyne, a reactive compound; so it goes, for example with a halogen addition reactions. When 2-butyne is the triple bond between carbon atoms 2 and 3, that in the interior of the molecule. Therefore is called 2 -butyne as an internal alkyne. The vapor pressure function is given by log P = 21.6295 - ( 2047.473 / T) -4.8153 logT.

Safety

2 -butyne is a highly flammable and irritant. He may enter violent polymerization and addition reactions.