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Lindlar Catalyst

Lindlar Catalyst (Pd/CaCO₃/Pb) - reducing reagent. Partial reduction of alkynes to cis-alkenes. Common uses: Alkyne → cis-Alkene (stops at alkene). Poisoned catalyst - lead prevents over-reduction. Syn addition gives cis product.

Reducing

Reagent details

Name

Lindlar Catalyst

Formula

Pd/CaCO₃/Pb

Category

Reducing

Function

Partial reduction of alkynes to cis-alkenes

Common Uses

  1. Alkyne → cis-Alkene (stops at alkene)

Notes

Poisoned catalyst - lead prevents over-reduction. Syn addition gives cis product.

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Reagents

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Dissolving Metal (Na/NH₃) (Na + NH₃(l)) - reducing reagent. Reduction of alkynes to trans-alkenes. Common uses: Alkyne → trans-Alkene. Birch reduction conditions. Liquid ammonia at -33°C. Radical mechanism gives trans product.

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