Alkynes are hydrogenated with two equivalents of hydrogen, in the presence of a finely divided metal catalyst, to form alkanes. The most commonly used catalysts are: platinum, palladium, rhodium...

hidrogenacion-alquinos

Hydrogenation is an exothermic reaction, and the heat given off is affected by the alkyne substituents. Thus, the internal alkynes give off less heat when hydrogenated than the terminal ones, due to their greater stability due to the phenomenon of hyperconjugation.

hidrogenacion-alquinos