A phosphine-free heterogeneous formylation of aryl halides catalyzed by a thioether-functionalized MCM-41-immobilized palladium complex

Abstract Thioether-functionalized MCM-41-immobilized palladium(II) complex [MCM-41-S-PdCl2] was found to be a highly efficient catalyst for the formylation of aryl iodides or bromides with CO (1 atm) using HCO2Na as a hydrogen source. This phosphine-free heterogeneous palladium complex can be easily recovered by simple filtration and reused for at least 10 consecutive trials without any decreases in activity.