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The catalyst named after H. Lindlar is used for the stereospecific hydrogenation of alkynes to cis alkenes. It consists of palladium deposited on barium sulfate or calcium carbonate. In order to prevent the complete hydrogenation to alkanes, the palladium sites are deactivated by adding catalyst poisons such as lead oxide or lead acetate/quinoline.
Recommended Learning Units
The learning unit describes different methods of synthesis of cis and trans alkenes by hydrogenation of alkynes.
ChemistryOrganic ChemistryReduction Reactions
This learning unit describes the hydrogenation of alkynes using the Lindlar catalyst. The catalyst itself and the stereochemistry of this reaction are explained.