Herein, the synthesis
of graphitic carbon nitride (g-C3N4) via the
simple heating of cheap and readily
available
urea as the starting material has been reported. The catalytic activity
of the prepared g-C3N4 was investigated for
the synthesis of chromeno[2,3-b]pyridine and benzylpyrazolyl
coumarin derivatives in an ethanol medium. The reactions were performed
under mild conditions to achieve widely functionalized target products
in a one-pot operation. The as-synthesized g-C3N4, being a heterogeneous catalyst, demonstrates excellent recyclability
up to the 5th consecutive run without a significant decrease in its
catalytic activity and yield of the product. A gram-scale reaction
was performed to demonstrate the industrial applications of the present
protocol. The green chemistry metrics such as environmental factor
(E-factor), atom economy (AE), carbon efficiency (CE), and reaction
mass efficiency (RME) were calculated and found to be very close to
the ideal values. Additionally, operation simplicity, wide substrate
scope, easy reusability of the catalyst, and avoidance of metal contamination
in the products drive the process toward green and sustainable development.
In this work, graphite oxide (GO) was developed from cheap and readily available graphite powder and used as a green heterogeneous carbocatalyst towards the synthesis of spirodibenzo[1,4]diazepine derivatives via one-pot...
The unification of CuCl2·2H2O and NiCl2·6H2O with the support of graphitic carbon nitride yielded to form an efficient, synergistic, bimetallic nano‐catalyst CuO–NiO@g‐C3N4. FT‐IR, SEM, TEM‐EDX, PXRD, RAMAN, TGA, and XPS were used as the confirmatory techniques to establish the evidence of its absolute formation. Catalyst with three different molar ratios of Cu and Ni, that is, Cu75Ni25 (Cu:Ni = 3:1; catalyst‐a), Cu50Ni50 (Cu:Ni = 1:1; catalyst‐b), and Ni66Cu33 (Ni:Cu = 2:1; catalyst‐c), was synthesized, and their catalytic activity was examined. The synergistic interaction of one metal with the other on the surface of extremely stable graphitic carbon nitride has enhanced the catalytic performance in the synthesis of triazole, tetrazole, and bis‐triazole derivatives to such a distinguished level (in ppm level), which a monometal fail to possess. The aforementioned statement has been supported by the catalytic activity data provided for both the monometallic and bimetallic catalyst herein. In addition to this, benign reaction conditions, in situ generation of azides, wide reaction scopes, and reusability of the catalyst were also the major advantages leading toward safe and sustainable chemistry beyond doubt.
In the present work, we have developed reduced graphene oxide (rGO) supported palladium nanoparticles (Pd NPs) based nanocatalyst which can smoothly promote Suzuki-Miyaura and Heck-Matsuda coupling reactions from diazoarenes under...
A one‐pot three‐component strategy for the synthesis of quinazoline derivatives under catalyst‐free and using CuO/GO nanocomposite has been developed. The catalytic approach proceeded under mild reaction conditions and offered improved yields of the target products within shorter reaction time. The excellent catalytic performance of CuO/GO can be ascribed to the synergistic interaction of the combined graphene oxide (GO) and nano‐sized CuO nanoparticles. A wide variety of substrates, including aromatic, heteroaromatic, and bulky aldehydes were explored to obtain highly functionalized quinazoline products in good to high yields. Furthermore, this atom‐efficient catalytic pathway has also been extended for the synthesis of quinazoline containing triazole and tetrazole rings. Additionally, the nanocatalyst could be easily recycled and reused five times without much appreciable loss in its activity.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.