3 research outputs found
Heterogeneous Route for the One-Pot Synthesis of N‑Arylamides from Aldoximes and Aryl Halides Using the CuO/Carbon Material
Metal oxide nanoparticles (NPs) stabilized
by porous carbon materials
(PCMs) are very promising for catalysis. In this work, monodispersed
small and stable copper oxide (CuO) NPs were prepared with an average
size of 10–20 nm without using any capping agent and then these
NPs were encapsulated into porous carbon. The chemical and structural
properties of the CuO/PCM material were characterized by powder X-ray
diffraction, electron microscopy, Raman spectroscopy, scanning electron
microscopy, transmission electron microscopy, and nitrogen sorption.
The obtained CuO/PCM nanocatalytic system has been used for the synthesis
of N-arylamides from the reaction of aldoximes and aryl halides. Generally,
copperÂ(II) salt was used for the preparation of amides from aldoximes
using some ligands and bases, but harsh reaction condition, stoichiometric
amount of metal, and lack of recyclability limit their applications
in industry. An alternative method is the use of heterogeneous catalysts.
More importantly, these heterogeneous catalysts could be easily recycled
and reused, showing potential application in organic synthesis
Biogenic Nano-CuO-Catalyzed Facile C–N Cross-Coupling Reactions: Scope and Mechanism
We demonstrate here
a green and efficient biogenic synthesis of copperÂ(II) oxide nanoparticles
using easily available <i>Ocimum Sanctum</i> leaf extract
at room temperature. The biogenic copper oxide nanoparticles have
shown excellent activity on N-arylation of cyclic and acyclic amides
with aryl and styryl halides. Broad substrate scope, excellent functional
group tolerance, and high yields were observed. This protocol is also
extended for the N-arylation of substituted aryl amines and nitrogen
heterocycles including pyrole, indole, imidazole, benzimidazole, and
carbazole. The catalyst was characterized by EPR, UV, FT-IR, BET,
AAS, TGA analysis, XPS, XRD, and HR-TEM
Sustainable Generation of Ni(OH)<sub>2</sub> Nanoparticles for the Green Synthesis of 5‑Substituted 1<i>H</i>‑Tetrazoles: A Competent Turn on Fluorescence Sensing of H<sub>2</sub>O<sub>2</sub>
A mutually correlated
green protocol has been devised that originates
from a sustainable production of β-NiÂ(OH)<sub>2</sub> nanoparticles
which is used for an efficient catalytic synthesis of versatile substituted
tetrazoles, under mild reaction conditions in water via a simple,
one-pot, eco-friendly method. The synthesis is followed by derivatization
into a highly fluorescence active compound 9-(4-(5-(quinolin-2-yl)-1<i>H</i>-tetrazol-1-yl)Âphenyl)-9<i>H</i>-carbazole that
can be used at tracer concentrations (0.1 ÎĽM) to detect as well
as quantify hydrogen peroxide down to 2 ÎĽM concentration. The
nanocatalyst was synthesized by a simple, proficient, and cost-effective
methodology and characterized thoroughly by UV–vis absorption
and Fourier transform infrared spectra, N<sub>2</sub> adsorption/desorption,
high resolution transmission electron microscopy, powder X-ray diffraction
pattern, field emission scanning electron microscopy, and thermogravimetric
analysis. Broad substrate scope, easy handling, higher efficiency,
low cost, and reusability of the catalyst are some of the important
features of this heterogeneous catalytic system. The strong analytical
performance of the resultant derivative in low-level quantification
of potentially hazardous hydrogen peroxide is the key success of the
overall green synthesis procedure reported here