Reactions of Alkynes

The reactions of alkynes closely parallel the reactions of alkenes. Addition reactions are typical. In these reactions, the CºC triple bond is converted into a C=C double bond. The alkenes formed from these reactions can undergo a tautomerization (see the hydration reactions below) or react further to produce alkane derivatives.

Type Reaction
Halogenation
(X = Cl, Br)
PROPYNE.gif A_XX.gif PROPXX.gif A_XX.gif PROPXXXX.gif
Hydro-
halogenation
(X = Cl, Br, I)
PROPYNE.gif A_HX.gif PROPHX.gif A_HX.gif PROPHXHX.gif
Hydrogenation
BUTYNE.gif A_H2pt.gif CISBUTEN.gif A_H2pt.gif BUTANE.gif
BUTYNE.gif A_H2LIND.gif CISBUTEN.gif
BUTYNE.gif A_LINH3.gif TRANBUTE.gif
Hydration
PROPYNE.gif A_HGHOH.gif ENOL.gif arrow.gif ACETONE.gif
PROPYNE.gif A_H2OBH3.gif PROPANAL.gif
Acidity of
Terminal
Alkynes
PROPYNE.gif A_NH2.gif ACETYLID.gif A_RCHHX.gif ADDITION.gif
Oxidative
Cleavage
PROPYNE.gif A_KMNO4.gif ACIDCO2.gif