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Polypyrrole stabilised palladium nanoparticles show good catalytic efficiency for the chemoselective transfer hydrogenation of alpha,beta- unsaturated carbonyl compounds. The catalyst is very specific and selectively hydrogenates the olefins or acetylenes only, without affecting the carbonyl moiety, with an excellent yield of products for a wide range of substrates. Podium position for palladium: A palladium-polypyrrole composite is synthesized for the chemoselective transfer hydrogenation of alpha,beta-unsaturated carbonyl compounds by using an in situ polymerisation and composite formation method. No semi-hydrogenated product was observed with alkyne systems and hydrodehalogenation of the haloarene segment of the substrate was not encountered in reactions with this catalyst.
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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate