چكيده به لاتين
Novel cellulose grafted to chitosan by EDTA (Cs-EDTA-Cell) materials were prepared and characterized adequately by various spectroscopic or microscopic methods as well as analytical techniques including FT-IR, UV-Vis, FESEM, EDX, XRD and TG/DT analysis. The Cs-EDTA-Cell network was found to be more thermally stable than its components, including chitosan and cellulose natural biopolymers. The bio-based Cs-EDTA-Cell network contains plenty of acidic and basic sites to act as a multifunctional nanocatalyst. The synergic effect of Cs-EDTA-Cell network components were demonstrated to promote four-component and pseudo-four-component synthesis of polyhydroquinoline and 1,8-dioxo-decahydroacridine derivatives under green and environmentally-benign conditions. A large number of fused Hantzsch esters were synthesized using low catalyst loading, in high to excellent yields and short reaction times, and simple work-up. Furthermore, this Cs-EDTA-Cell network, as a heterogeneous catalyst, demonstrated excellent reusability and can be used at least for five consecutive runs without significant loss of its catalytic activity.
