Hydrogenation of Alkenes with Metal Catalysts
Hydrogenation of Alkenes with Metal Catalysts: Chemoselectivity
Conditions used for the heterogeneous catalytic hydrogenation of alkenes can also be employed for the reduction of most other reducible functional groups with the exception of carboxylic acids, esters, ketones, and aldehydes which are not affected. Highly substituted double bonds are hydrogenated at a slower rate.
Double bonds in conjugation with carbonyl groups are also less reactive.
Triple bonds in the presence of double bonds will be hydrogenated preferentially to alkenes. Poisoned catalysts, such as the Lindlar catalysts, are used to avoid further reduction.