Efficient, Selective, and Recyclable Palladium Catalysts in Carbon-Carbon Coupling Reactions

Literature information of palladium-catalyzed coupling reactions performed with efficient and recyclable catalyst systems with focus on the three major transformations and relevant data for related coupling reactions studied less frequently is compiled. Choudary and co-workers exchanged Cl ions of a layered double hydroxide (LDH) for PdCl4 2- ions and reduced the resulting material with hydrazine hydrate to get catalyst 10.1% Pd-LDH. Gladysz and Rocaboy have studied thermomorphic fluorous N-donor and S-donor palladacycles in Heck coupling. A heavily fluorinated 1,3,5-triazine-based aromatic sulfur compound bearing functional groups with high affinity for metals was synthesized and used as stabilizer of Pd nanoparticles. Cho described a method to carry out the coupling of aroyl chlorides with NaBPh4 in the presence of Pd nanoparticles generated by reacting Pd(OAc)2 and PEG-2000 as described earlier to furnish diaryl ketones.