A scientific open acces journal in the field of synthetic organic chemistry and polymers
Organic CommunicationsA scientific open acces journal in the field of synthetic organic chemistry and polymers
Microwave-assisted preparation of graphene quantum dots immobilized nanosilica as an efficient heterogeneous nanocatalyst for the synthesis of xanthenes
Abstract: Graphene quantum dots (GQDs) immobilized nanosilica was prepared under microwave irradiated green reaction conditions and was used as an efficient heterogeneous acid catalyst. The structure of nano-catalyst was characterized by FT-IR, PL, TEM, XRD, FE-SEM, EDS, TGA, and zeta potential. Xanthene derivatives were synthesized in excellent yields using the freshly prepared catalyst and the catalyst could be easily recovered and recycled for 5 times without significant loss of its catalytic activity. The structures of the resulted products were confirmed by FT-IR, 1H-NMR, 13C-NMR spectroscopic techniques.
DOI http://doi.org/10.25135/acg.oc.188.8.131.521 (DOI number will be activated after the manuscript has been available in an issue.) Keywords Graphene quantum dots heterogeneous nanocatalyst nanosilica xanthene Available online: March 01, 2019 DETAILS DOWNLOAD PDF © ACG Publications. All rights reserved.
Piperidine-functionalized Fe3O4 Supported Graphene Quantum dots as an Efficient Catalyst for the Synthesis of 2-Aminochromenes under Solvent-free Conditions
Fe3O4 supported graphene quantum dots (GQDs) (Fe3O4@GQDs) was prepared under microwave irradiation. Piperidine was bound to Fe3O4@GQDs via its reaction with 3-piperidinopropyltrimethoxysilane and piperidine-functionalized Lewis basic nano-catalyst (Fe3O4@GQDs-Pip) was prepared. This freshly prepared catalyst was evaluated as a heterogeneous magnetic reusable catalyst for the one-pot synthesis of 2-aminochromenes under MW-assisted solvent-free conditions. Two composite particles, Fe3O4@GQDs and Fe3O4@GQDs-Pip were characterized by FT-IR, XRD, SEM, TGA and VSM analytical methods. The catalyst could be easily recovered by magnetic separation and recycled for 5 times without significant loss of its catalytic activity.DOI http://doi.org/10.25135/acg.oc.184.108.40.2060 (DOI number will be activated after the manuscript has been available in an issue.) Keywords Heterogeneous nano-catalyst; Chromene; Magnetic graphene quantum dots; Piperidine. Available online: February 13, 2019 DETAILS DOWNLOAD PDF © ACG Publications. All rights reserved.