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- Lindlar_catalyst abstract "A Lindlar catalyst is a heterogeneous catalyst that consists of palladium deposited on calcium carbonate or barium sulfate 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 (i.e. without further reduction into alkanes).Thus if a compound contains a double bond as well as a triple bond, only the triple bond reduces to a double bond as opposed to both bonds being reduced down to a single bond.[citation needed]As described by its inventor Herbert Lindlar, 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. A recent description on how the poisons act on the selectivity of the Lindlar catalyst identifies a complementary role of the poisons while Pb reduces the amount of hydrogen content in the bulk of Pd, quinoline blocks the formation of oligomers.Alkyne reduction is stereoselective, occurring via syn addition to give the cis-alkene. An example of commercial use is the organic synthesis of vitamin A which involves an alkyne reduction with the Lindlar catalyst.Other heterogeneous catalysts useful for hydrogenation are Adams' catalyst, Palladium black, and Raney nickel.".
- Lindlar_catalyst wikiPageID "1997096".
- Lindlar_catalyst wikiPageRevisionID "540541200".
- Lindlar_catalyst hasPhotoCollection Lindlar_catalyst.
- Lindlar_catalyst subject Category:Catalysts.
- Lindlar_catalyst subject Category:Palladium_compounds.
- Lindlar_catalyst type Abstraction100002137.
- Lindlar_catalyst type Activator114723079.
- Lindlar_catalyst type Catalyst114723628.
- Lindlar_catalyst type Catalysts.
- Lindlar_catalyst type Cognition100023271.
- Lindlar_catalyst type Compound105870180.
- Lindlar_catalyst type Concept105835747.
- Lindlar_catalyst type Content105809192.
- Lindlar_catalyst type Idea105833840.
- Lindlar_catalyst type Matter100020827.
- Lindlar_catalyst type PalladiumCompounds.
- Lindlar_catalyst type Part113809207.
- Lindlar_catalyst type PhysicalEntity100001930.
- Lindlar_catalyst type PsychologicalFeature100023100.
- Lindlar_catalyst type Relation100031921.
- Lindlar_catalyst type Substance100019613.
- Lindlar_catalyst type Whole105869584.
- Lindlar_catalyst comment "A Lindlar catalyst is a heterogeneous catalyst that consists of palladium deposited on calcium carbonate or barium sulfate 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 (i.e.".
- Lindlar_catalyst label "Catalizador Lindlar".
- Lindlar_catalyst label "Catalyseur de Lindlar".
- Lindlar_catalyst label "Lindlar catalyst".
- Lindlar_catalyst label "Lindlar-Katalysator".
- Lindlar_catalyst label "リンドラー触媒".
- Lindlar_catalyst label "林德拉催化剂".
- Lindlar_catalyst sameAs Lindlárův_katalyzátor.
- Lindlar_catalyst sameAs Lindlar-Katalysator.
- Lindlar_catalyst sameAs Catalizador_Lindlar.
- Lindlar_catalyst sameAs Catalyseur_de_Lindlar.
- Lindlar_catalyst sameAs リンドラー触媒.
- Lindlar_catalyst sameAs m.06ctj0.
- Lindlar_catalyst sameAs Q902405.
- Lindlar_catalyst sameAs Q902405.
- Lindlar_catalyst sameAs Lindlar_catalyst.
- Lindlar_catalyst wasDerivedFrom Lindlar_catalyst?oldid=540541200.
- Lindlar_catalyst isPrimaryTopicOf Lindlar_catalyst.