synthesis of SOH supported FeO@resorcinol-formaldehyde resin core/shell and its catalytic evaluation towards the synthesis of hexahydroquinoline derivatives in green conditions.

A novel spherically shaped core@double-shell acidic nanocatalyst (FeO@SiO@RF-SOH) [RF: resorcinol-formaldehyde resin] was prepared and completely characterized using X-ray diffraction, Fourier transform infrared spectroscopy, vibrating sample magnetometry, energy dispersive X-ray spectroscopy, thermogravimetric analysis, transmission electron microscopy and field-emission scanning electron microscopy. The concentration of H loaded on the FeO@SiO@RF was reported to be 1.3 mmol g. The well-defined FeO@SiO@RF-SOH core-shell heterostructures exhibited high stability, efficient recyclability (10 cycles), and promoted catalytic activity for one-pot condensation reaction between the aromatic aldehydes, dimedone, malononitrile, and ammonium acetate for the synthesis of hexahydroquinoline derivatives.