Hafnium(IV) bis(perfluorooctanesulfonyl)imide complex supported on fluorous silica gel catalyzed N-formylation of amines using aqueous formic acid

The treatment of amines with aqueous formic acid in the presence of Hf(NPf2)4 supported on fluorous silica gel brings about highly efficient N-formylation to give the corresponding formamides in high yields. The N-formylation reaction not only involves mild conditions, simple operation, and high yields but also recyclable catalyst.