Covalent immobilization of di-cationic DABCO ionic liquid over graphene oxide as an efficient and recyclable nanocomposite for the synthesis of Knoevenagel and Hantzsch reactions
摘要
This work describes the development of DABCO-based di-cationic ionic liquid immobilized over graphene oxide as a heterogeneous nanocomposite. Different physico-chemical characterization techniques were utilized to characterize the synthesized nanocomposite, including FT-IR, XRD, NMR, TGA, SEM, TEM, elemental mapping and EDX analysis. Next, the successfully prepared nanocomposite was employed for the Knoevenagel and Hantzsch reactions. The main advantages of this nanocomposite include the excellent product yield in mild reaction conditions and the tolerance ability towards various substrates with different substituents. Moreover, the nanocomposite could be recycled multiple times without any noticeable loss in its catalytic activity and morphology.
Graphical abstract