Green synthesis of nitroenamines by γ-Fe2O3@SiO2–OSO3H nanoparticles as a highly efficient and magnetically separable catalyst

Some derivatives of nitroenamines were synthesized in moderate to good yields in the presence of sulfonic acid supported on silica-modified maghemite (γ-Fe2O3@SiO2–OSO3H) as a highly efficient and magnetically separable catalyst. Both up to five times recyclability and the magnetic separation are salient features of this catalytic system.