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Alkyne Reactions: Alkyne Reduction using Lindlars Catalyst and H2
Lindlars catalyst and hydrogen gas (H2) will react with alkynes to form alkenes:
The H2 and alkyne are adsorbed onto the surface of Lindlars catalyst. This reaction adds a hydrogen to each carbon on the alkyne bond, reducing the bond to an alkene bond. The hydrogens are added in a cis fashion, not trans:
NOT trans Addition
The reaction mechanism is depicted below:
In the first step, the H2 and alkyne adsorb to Lindlars catalyst, which catalyzes the reaction.
In the second step, the alkyne bond is able to react with H2, resulting in a cis addition of hydrogen to each carbon atom and the reduction of the triple bond to a double bond.
The reagent used for this reaction is H2 with Lindlars catalyst, represented by Pd in the mechanism figure.