A powerful, magnetic, supported, acid catalyst, NiFe2O4@SiO2–H3PW12O40, was prepared by chemical support of Keggin (H3PW12O40) heteropolyacid (HPA) on silica-coated NiFe2O4 magnetic nanoparticles. XRD, TEM, SEM, VSM, and FTIR confirmed that the keggin HPA is well dispersed on the surface of silica-coated NiFe2O4 magnetic nanoparticles. The magnetically recoverable catalyst could be easily recycled at least six times without significant loss of catalytic activity. After full characterization, its catalytic activity was investigated in the synthesis of tetrahydrobenzo[b]pyran and pyrano[2,3-c]pyrazole derivatives. (1) Novel silica-coated magnetic NiFe2O4 nanoparticles-supported H3PW12O40 was fabricated and characterized. (2) Recyclability of the catalyst. (3) Avoiding use of corrosive acid catalysts. (4) Green chemistry.

Silica-coated magnetic NiFe2O4 nanoparticles-supported H3PW12O40; synthesis, preparation, and application as an efficient, magnetic, green catalyst for one-pot synthesis of tetrahydrobenzo[b]pyran and pyrano[2,3-c]pyrazole derivatives

HPA-dendrimer functionalized magnetic nanoparticles (Fe3O4@D-NH2-HPA) as a novel inorganic-organic hybrid and recyclable catalyst for the one-pot synthesis of highly substituted pyran derivatives

A green and recoverable nano-structured diphosphate (Na2CaP2O7) was synthesized and fully characterized using FT-IR spectra, X-ray diffraction patterns (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX) analysis. The nanostructured catalyst has been successfully used as reusable nanostructured catalyst for green, simple and efficient synthesis of tetrahydrobenzo[b]pyrans, pyrano[2,3-c]pyrazoles and spiro[indoline-3,4′-pyrano[2,3-c]pyrazoles in aqueous media. The catalyst shows environmentally benign character, which can be easily prepared, stored, and recovered several times without obvious significant loss of catalytic activity.

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Green synthesis of tetrahydrobenzo[b]pyrans, pyrano[2,3-c]pyrazoles and spiro[indoline-3,4′-pyrano[2,3-c]pyrazoles catalyzed by nano-structured diphosphate in water

Green Synthesis of bis-Coumarin and Dihydropyrano[3,2-c]chromene Derivatives Catalyzed by o-Benzenedisulfonimide

One-Pot Synthesis of Polyhydroquinolines Catalyzed by ZnCl2 Supported on Nano Fe3O4@SiO2

An efficient route for the synthesis of 2-amino-4H-benzo[g]chromenes via a three-component coupling reaction of aldehydes, malononitrile and 2-hydroxy-1,4-naphthaquinone in the presence of Zn( L-proline)2 is reported. High yields, short reaction times, non-toxicity and recyclability of the catalyst, and easy work-up are the main merits of this protocol. Copyright © 2015 John Wiley & Sons, Ltd.

Zn( L‐proline)2 as a powerful and reusable organometallic catalyst for the very fast synthesis of 2‐amino‐4H‐benzo[g]chromene derivatives under solvent‐free conditions

New basic ionic liquid from ethan-1,2-diyl bis (hydrogen sulfate) and DBU (1,8-diazobicyclo[5.4.0]undec-7-ene) as an efficient catalyst for one-pot synthesis of xanthene derivatives

The title chromenes (IV) are efficiently obtained by three-component coupling reaction of various aldehydes (II), malononitrile (III), and naphthoquinone (I).

Zn(L‐proline)2 as a Powerful and Reusable Organometallic Catalyst for the Very Fast Synthesis of 2‐Amino‐4H‐benzo[g]chromene Derivatives under Solvent‐Free Conditions.

Saeed Babaee

Papers

Zn( L‐proline)2 as a powerful and reusable organometallic catalyst for the very fast synthesis of 2‐amino‐4H‐benzo[g]chromene derivatives under solvent‐free conditions

New basic ionic liquid from ethan-1,2-diyl bis (hydrogen sulfate) and DBU (1,8-diazobicyclo[5.4.0]undec-7-ene) as an efficient catalyst for one-pot synthesis of xanthene derivatives

Zn(L‐proline)2 as a Powerful and Reusable Organometallic Catalyst for the Very Fast Synthesis of 2‐Amino‐4H‐benzo[g]chromene Derivatives under Solvent‐Free Conditions.