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Lindlar catalyst
A Lindlar catalyst is a heterogeneous catalyst that consists of palladium deposited on calcium carbonate and treated with various forms of lead. The lead additive serves to deactivate the palladium sites. A variety of "catalyst poisons" have been used including lead acetate and lead oxide. The palladium content of the catalyst is usually 5% by weight. The catalyst is used for the hydrogenation of alkynes to alkenes. Additional recommended knowledgeAs described by its inventor,[1][2] the catalyst is prepared by reduction of palladium chloride in a slurry of calcium carbonate followed by adding lead acetate. By this approach, one obtains a catalyst with a large surface area. Further deactivation of the catalyst with quinoline enhances its selectivity, preventing formation of alkanes. An example of alkyne reduction is the reduction of phenylacetylene to styrene.[1] Alkyne reduction is stereoselective, occurring via syn addition to give the cis-alkene.[3] The commercial organic synthesis of vitamin A also involves an alkyne reduction with the Lindlar catalyst. Other heterogeneous catalysts useful for hydrogenation are Adam's Catalyst, Palladium Black, and Raney nickel. References
Categories: Catalysts | Palladium compounds |
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Lindlar_catalyst". A list of authors is available in Wikipedia. |