A magnetically recyclable palladium-catalyzed formylation of aryl iodides under CO
gas-free conditions has been developed by using a bidentate phosphine ligand-modified
magnetic nanoparticles-anchored palladium(II) complex [2P-Fe3O4@SiO2-Pd(OAc)2] as catalyst, yielding a wide variety of aromatic aldehydes in moderate to excellent
yields. Here, formic acid was employed as both the CO source and the hydrogen donor
with iodine and PPh3 as the activators. This immobilized palladium catalyst can be obtained via a simple
preparative procedure and can be facilely recovered simply by using an external magnetic
field, and reused at least 9 times without any apparent loss of catalytic activity.
Key words
formylation - palladium - magnetic nanoparticles - heterogeneous catalysis - aromatic
aldehyde