Design, preparation and characterization of Fe3O4@SiO2@ECH@thiocarbazide@Au(i)@chitosan nanoparticles as a catalyst for the synthesis of 3,4-dihydropyrano[3,2-c]chromenes

Magnetic iron/silica/linker/gold ions/chitosan nanostructures were synthesized to achieve an efficient and reusable catalyst characterized by a range of methods.