Organic Communications

Articles In Press

Original Article

1) Microwave-assisted preparation of graphene quantum dots immobilized nanosilica as an efficient heterogeneous nanocatalyst for the synthesis of xanthenes

Org. Commun. (2019) in press ; 1 - 12
by Somayeh Pahlavan Moghanlo and Hassan Valizadeh

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.53.18.11.1051
(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
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© ACG Publications. All rights reserved.
Original Article

2) Piperidine-functionalized Fe3O4 Supported Graphene Quantum dots as an Efficient Catalyst for the Synthesis of 2-Aminochromenes under Solvent-free Conditions

Org. Commun. (2019) in press ; 1 - 12
by Somayeh Pahlavan Moghanlo and Hassan Valizadeh

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.52.18.11.1070
(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
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© ACG Publications. All rights reserved.