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Ultrasound‐Assisted Preparation of Copper(I) Oxide Nanocubes: High Catalytic Activity in the Synthesis of Quinazolines
Author(s) -
Raut Amol B.,
Tiwari Abhishek R.,
Bhanage Bhalchandra M.
Publication year - 2017
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201601330
Subject(s) - thermogravimetric analysis , catalysis , differential scanning calorimetry , fourier transform infrared spectroscopy , copper , nuclear chemistry , materials science , spectroscopy , nanoparticle , chemistry , chemical engineering , inorganic chemistry , nanotechnology , organic chemistry , physics , quantum mechanics , engineering , thermodynamics
A facile and green ultrasound‐assisted synthesis of Cu 2 O nanocubes at room temperature is presented. The Cu 2 O nanocubes were characterized using XRD, SEM, TEM, energy‐dispersive X‐ray spectroscopy, UV/Vis spectroscopy, differential scanning calorimetry with thermogravimetric analysis, and FTIR spectroscopy. The Cu 2 O nanocubes were employed as a heterogeneous nanocatalyst and were found to be highly active in the preparation of quinazolines by the tandem cyclization of 2‐bromobenzaldehydes with amidines under ligand‐free conditions. Various quinazolines could be prepared in excellent yields within a very short reaction time. Furthermore, the Cu 2 O nanocatalyst could be recycled and reused up to four times without any significant loss of catalytic activity.