عنوان مقاله [English]
In this project, crosslinked Styrene-Co-Maleic anhydride Polymer Catalyst modified with NiSO4 hexahydrate, as an efficient heterogeneous polymer-based nanocatalyst was synthesized in three steps. First, Styrene-Co-Maleic anhydride polymer was synthesized by radical polymerization of styrene in maleic anhydride, then the resulted copolymer was crosslinked with 1,3-phenylenediamine and finally the crosslinked copolymer was modified with NiSO4. This polymer-based nanocatalyst was investigated and identified using Fourier-transform infrared spectroscopy (FT-IR), Energy Dispersive X-Ray (EDX) (EDX), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM). In order to investigate the catalytic properties of CPSMA-Ni, the synthesis of various types of 2-amino-4H-chromane derivatives was investigated using the reaction of aldehyde derivatives with malononitrile in the presence of dimedone, resorcinol or naphthols. 2-Amino-4H-Cromans were synthesized with good to excellent efficiency (85%-96%) under mild conditions. This heterogeneous polymeric catalyst has a good performance in the synthesis of chromium derivatives. This catalyst can be recycled without pre-activation and reloaded up to 5 consecutive runs without significant decrease in its efficiency.