Ionic Liquid Catalyst For Synthesis Research Articles

Cycloaddition of propylene oxide and carbon dioxide using CoMn2O4 nanoparticles supported onto dendritic fibrous nanosilica

An environmentally friendly surface modification method was employed to synthesize a solid ionic liquid catalyst appropriate. The fabrication of green heterogeneous nano catalysts by chemical modification is determined to be very attractive in the case of the conversion of CO2 into value-added products. Herein, we reported chemical composition of epoxides, and carbon dioxide to prepare poly(propylene carbonate) in the presence of nanoparticles of CoMn2O4 stably placed on the surface of DFNS (dendritic fibrous nanosilica) by cellulose (cellulose@DFNS-CoMn2O4) as a nanocatalyst. Poly(propylene carbonate) with a Ma (average molecular weight) of 6497 kg/mol and 76% yield was obtained at 2 h and 100 °C as a reaction time and reaction temperature. With the aim of preparing the catalyst, cellulose was used to activate the DFNS surface to be employed as a substrate to support nanoparticles of CoMn2O4. Cellulose eliminates the need for a reducing agent and acts as a reducing natural agent and stabilizing for nanoparticles of CoMn2O4. The morphology of the final compound affected the catalytic feature of ionic liquid catalyst for synthesis of carbonyl compounds.

Preparation and application of triphenyl(propyl-3-hydrogen sulfate)phosphonium bromide as new efficient ionic liquid catalyst for synthesis of 5-arylidene barbituric acids and pyrano[2,3-d]pyrimidine derivatives

We report synthesis of triphenyl(propyl-3-hydrogen sulfate)phosphonium bromide ([TPPHSP]Br) as a reusable green Bronsted-acidic ionic liquid catalyst and its application for synthesis of 5-arylidene barbituric acids and pyrano[2,3-d]pyrimidine derivatives by condensation reaction between aromatic aldehydes and barbituric acid or aromatic aldehydes, malononitrile, and barbituric acid in EtOH–H2O in reflux condition with good to excellent yield. The [TPPHSP]Br IL catalyst was characterized by Fourier-transform infrared (FT-IR) spectroscopy, 1H and 13C nuclear magnetic resonance (NMR), and thermogravimetric (TG) analysis and showed good catalytic activity and reusability.

Hexamethylenetetramine grafted layered double hydroxides as a novel and green heterogeneous ionic liquid catalyst for the synthesis of pyrido[2,3-d]pyrimidine derivatives

In this research layered double hydroxides functionalized with (3r,5r,7r)-1-(3-(triethoxysilyl)propyl)-1,3,5,7-tetraazaadamantan-1-ium chloride (LDHs–TPTAACl) as a novel, green, efficient and recyclable heterogeneous ionic liquid were synthesized and characterized by various methods, such as FT-IR, TGA, SEM, EDX, TEM and XRD. The mentioned catalyst was applied as a new ionic liquid catalyst for the one-pot three-component synthesis of a new class of pyrido[2,3-d]pyrimidine derivatives through combination of aromatic aldehydes, 2,4-thiazolidinedione and N,N-dimethyl-6-amino uracil using water as solvent in high to excellent yield and short reaction times. The LDHs–TPTAACl catalyst could be simply recycled and reused up to five continuous runs with no substantial structural change and loss of activity.

3,6-Dioxaoctamethylenediamminium trifluoromethanesulfonate [3,6-DOMDA]OTf as a novel ionic liquid catalyst for the synthesis of functionalized 1,4-dihydropyridines

Abstract In this research [3,6-DOMDA]OTf as a novel ionic liquid was synthesized and fully characterized by Fourier transform infrared (FT-IR), nuclear magnetic resonance (1H NMR, 13C NMR, 19F NMR), Mass spectrometry, Thermal gravimetric (TG), Derivative thermal gravimetric (DTG) and Differential thermal analysis (DTA). Described [3,6-DOMDA]OTf was used as a novel ionic liquid catalyst for the domino one-pot four-component synthesis of functionalized 1,4-dihydropyridine derivatives by a combination of various aldehydes, malononitrile, acetylenedicarboxylates and anilines under solvent-free condition at 50 °C. [3,6-DOMDA]OTf catalyst with etheric bonds can be recovered and reused up to six times without significant loss of activity. The mentioned compounds were synthesized in high to excellent yields, short reaction time and their products could be easily separated.

Synthesis of 1,8-dioxo-octahydroxanthenes and bis(indolyl)methanes catalyzed by [Et3NH][H2PO4] as a cheap and mild acidic ionic liquid

Triethyl ammonium dihydrogen phosphate was used as a cheap and mild acidic ionic liquid catalyst for synthesis of 1,8-dioxo-octahydroxanthenes and bis(indolyl)methanes. This methodology offers several advantages, such as good yields, short reaction times, simple procedure, and mild conditions.