Producing, characterizing and utilizing a novel magnetic catalyst to promote construction of N,N′-alkylidene bisamides

A novel magnetic material namely [Fe3O4@SiO2@RNMe2-SO3H][Cl/MeSO3] (FSRNSCM) was produced. Energy-dispersive X-ray spectroscopy (EDS), field emission scanning electron microscopy (FE-SEM), FT-IR, X-ray diffraction (XRD), vibrating-sample magnetometry (VSM), thermal gravimetric (TG) and differential thermal gravimetric (DTG) analyses were utilized to characterize it. Most of the particles had nano sizes, some of which were more than 100 nm. Thereafter, FSRNSCM was applied as an efficacious and magnetically recyclable catalyst for the solvent-free condensation of arylaldehydes (1 eq.) and primary amides (2 eq.) to construct N,N′-alkylidene bisamides.