Fur-imine-functionalized graphene oxide-immobilized copper oxide nanoparticles (Cu(II)-Fur-APTES/GO) are synthesized and found to be a cost-effective, efficient, and reusable heterogeneous nanocatalyst for the preparation of pharmaceutically important xanthene derivatives under greener solvent conditions. Cu(II)-Fur-APTES/GO exhibits excellent result in the synthesis of xanthenes with reduced reaction time (25−50 min) and higher yields (up to 95%) and has a simple procedure, ease of product separation, and no byproducts. Moreover, the nanocatalyst has a Cu loading of 13.5 at. % over functionalized GO which is far superior than the already known metal-based heterogeneous catalysts. The newly synthesized catalyst has been characterized by various physiochemical techniques such as X-ray photoelectron spectroscopy, X-ray diffraction, energy-dispersive X-ray, Raman spectroscopy for structural characterization, field emission scanning electron microscopy and high-resolution transmission electron microscopy for ...

Fur-Imine-Functionalized Graphene Oxide-Immobilized Copper Oxide Nanoparticle Catalyst for the Synthesis of Xanthene Derivatives.

SmCl3 (20 mol%) has been used as an efficient catalyst for reaction between aromatic aldehydes and 5,5-dimethyl-1,3-cyclohexanedione at 120°C to give 1,8-dioxo-octahydroxanthene derivatives in high yield. The same reaction in water, at room temperature gave only the open chain analogue of 1,8-dioxo-octahydroxanthene. Use of eco-friendly green Lewis acid, readily available catalyst and easy isolation of the product makes this a convenient method for the synthesis of either of the products.

/pdf/a-highly-efficient-green-synthesis-of-1-8-dioxo-1wma4ar5mo.pdf

A highly efficient green synthesis of 1, 8-dioxo-octahydroxanthenes

Succinimide-N-sulfonic acid: An efficient catalyst for the synthesis of xanthene derivatives under solvent-free conditions

Imidazole-based ionic liquid-stabilized on silica coated Fe 3 O 4 magnetic nano particles [nano-Fe 3 O 4 @SiO 2 @(CH 2 ) 3 -Imidazole-SO 3 H]Cl as a novel heterogeneous acidic catalyst was designed, synthesized and fully characterized by FT-IR, thermo gravimetric analysis (TGA), differential thermal analysis (DTA), energy-dispersive x-ray spectroscopy (EDX), X-ray diffraction patterns (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), Brunauer–Emmett–Teller (BET) and inductively coupled plasma (ICP) analysis. The nano-structured organo solid catalyst as a novel, mild and full-fledged catalyst was used for the cascade synthesis of 1,8-dioxo-octahydroxanthene derivatives by the condensation reaction between dimedone and various aldehydes at 80 °C under solvent-free conditions. Similarly, dihydropyrano[2,3- c ]pyrazole derivatives were synthesized by the one-pot three-component condensation reaction of aldehydes, malononitrile and 3-methyl-1-phenyl-2-pyrazoline-5-one under solvent-free conditions at room temperature. To the knowledge of our science, this is the main investigation on the synthesis of [nano-Fe 3 O 4 @SiO 2 @(CH 2 ) 3 -Imidazole-SO 3 H]Cl as a worthy heterogeneous nano magnetic solid acid for acid catalyzed organic reactions.

/pdf/applications-of-a-novel-nano-magnetic-catalyst-in-the-4v59yxh00p.pdf

Applications of a novel nano magnetic catalyst in the synthesis of 1,8-dioxo-octahydroxanthene and dihydropyrano[2,3-c]pyrazole derivatives

Sulfated polyborate catalyzed Kabachnik-Fields reaction: An efficient and eco-friendly protocol for synthesis of α-amino phosphonates

An efficient synthesis of 2,2′-arylmethylene bis(3-hydroxy-5,5-dimethyl-2-cyclohexene-1-one) and 1,8-dioxooctahydroxanthenes using ZnO and ZnO–acetyl chloride

α-Amino phosphonates were obtained in a one-pot, simple, and efficient method from the reaction between aldehyde, aniline, trialkyl phosphite, and silica sulfuric acid as a catalyst in acetonitrile at room temperature. © 2009 Wiley Periodicals, Inc. Heteroatom Chem 20:316–318, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20543

An efficient synthesis of α‐Amino phosphonates using silica sulfuric acid as a heterogeneous catalyst

Silica Supported Perchloric Acid (HClO4 – SiO2): Highly Efficient Heterogeneous Catalyst for the Synthesis of α-Amino Phosphonates

An Efficient Synthesis of α-Amino Phosphonates Using Silica Sulfuric Acid as a Heterogeneous Catalyst.

2,2′-Arylmethylene bis(3-hydroxy-5,5-dimethyl-2-cyclohexene-1-one) 4l-s produced from reaction between dimedone with various aldehydes in acetonitrile using ZnO as a catalyst; whereas in the presence of ZnO–acetyl chloride catalysts the reaction is limited to give only 1,8-dioxo-octahydroxanthenes 3a-k in very good yields.

An Efficient Synthesis of 2,2′‐Arylmethylene Bis(3‐hydroxy‐5,5‐dimethyl‐2‐cyclohexene‐1‐one) and 1,8‐Dioxooctahydroxanthenes Using ZnO and ZnO—Acetyl Chloride.

Zahra Shahkarami

Papers

An efficient synthesis of 2,2′-arylmethylene bis(3-hydroxy-5,5-dimethyl-2-cyclohexene-1-one) and 1,8-dioxooctahydroxanthenes using ZnO and ZnO–acetyl chloride

An efficient synthesis of α‐Amino phosphonates using silica sulfuric acid as a heterogeneous catalyst

Silica Supported Perchloric Acid (HClO4 – SiO2): Highly Efficient Heterogeneous Catalyst for the Synthesis of α-Amino Phosphonates

An Efficient Synthesis of α-Amino Phosphonates Using Silica Sulfuric Acid as a Heterogeneous Catalyst.

An Efficient Synthesis of 2,2′‐Arylmethylene Bis(3‐hydroxy‐5,5‐dimethyl‐2‐cyclohexene‐1‐one) and 1,8‐Dioxooctahydroxanthenes Using ZnO and ZnO—Acetyl Chloride.