Preparation of DABCO‐Based Acidic‐Ionic‐Liquid‐Supported ZnO Nanoparticles and Their Application for Ecofriendly Synthesis of <i>N</i> ‐Aryl Polyhydroquinoline Derivatives

Abstract

Abstract Here we have reported a new significant DABCO based acidic ionic liquid ([DABCO(C 2 COOH) 2 ] 2+ [Br − ] 2 ). With the assistance of this IL, ZnO nanoparticle (NP) supported [DABCO (C 2 COOH) 2 ] 2+ [Br − ] 2 immobilised ZnO‐[DABCO(C 2 COOH) 2 ] 2+ [Br − ] 2 was established, a new supported Catalyst with an ionic liquid layer (SCILL,). Since ZnO nanoparticles are amphoteric in nature and DABCO based ionic liquid is acidic in nature, it posses both acidic and basic catalytic site in a single moiety. With the assistance of this quasi heterogeneous, efficient, recyclable catalyst we were able to produce series of N‐aryl hexahydroquinolines in aqueous medium with good to excellent yield within shorter reaction time. This catalyst was characterised by Scanning Electron Microscope (SEM), High Resolution Transmission Electron Microscope (HRTEM), Energy Dispersive Analysis X‐ray (EDAX), Dynamic Light Scattering Spectroscopy (DLS), Powder X‐Ray Diffraction (PXRD), Thermo Gravimetric Analysis (TGA) and Fourier Transform Infrared spectroscopy (FT‐IR). Here, synergetic catalytic effect of amphoteric heterogeneous zinc oxide nanoparticles and acidic homogeneous DABCO based ionic liquid were commendably compiled.