Thermal-regulated PEG1000-based ionic liquid/PM for one-pot three-component synthesis of 2,4,5-trisubstituted imidazoles

Poly(ethylene glycol)‐Based Ionic Liquids: Properties and Uses as Alternative Solvents in Organic Synthesis and Catalysis

“…Similarly, [PEG-DIL][MsO] solvents 11 c-g [40,44,45] were obtained, starting from mesylated mPEG (Scheme 4). [PEG 800 -DPIL][Cl] (11 h), [46] [MeIm-PEG 400 ImMe][Br] (11 i), [18] and the diglyceryl-functionalized [diol-PEG 1000 DIL][PF 6 ] (13), [47] containing two vicinal hydroxyl groups, were synthesized starting from native PEG through Route A after three steps [12] (Scheme 5).…”

Iron nanotube-silica composite (ZVI-S-PCAT modified silica composite) preparation, characterization and application as a recyclable catalytic system for 5-membered ring organic transformations

“…For this, 25 MPS modified 5 g silica was stirred with ethanolic NaOH, pH of alcoholic sol. kept between 9-10 at 110 o C for 4 h and to this is added 5 g urea and stirred at same temperature for 10 h. This modified support has been neutralized using ethanol washings and dried in oven at 100 o C. Finally this amide modified support is added to simultaneously prepared ZVI nanoparticles prepared as aforementioned methodology and stirred for 4 h at room temperature ( 22 o C), washed with 20 mL ethanol thrice [13] 30 and dried at vaccum.…”

“…In the context of using ZVI as catalyst in organic transformations, some of the work includes iron (0) nanoparticle-catalyzed hydrogenation in water in flow, 6 iron(0) nanoparticles as catalysts for the selective hydrogenation of unsaturated C-C bonds, 7 iron-iron oxide core-shell nanoparticles (Fe CSNPs) in the hydrogenation of olefins in ethanol 20 and in the presence of water, 8 graphene-supported iron-based nanoparticles encapsulated in nitrogen-doped carbon as a catalyst for hydrogen evolution and oxygen reduction reactions, 9 supported iron nanoparticles as catalysts for sustainable production of lower olefins, 10 asymmetric transfer hydrogenation of ketones using iron (0). 11 From the existing procedures of preparing and stabilizing zerovalent iron nanoparticles we present here a chemically modified 25 support material to stabilize Fe (0) nps and the difference observed from the earlier reported methods have shown the formation of nanotubes of iron and here we present a methodology wherein chemical modification of support material has brought such structural changes to give metallic nanotubes formation which is an important feature forming grounds to study their electrical, thermal and optical properities besides being studied as a catalyst in the present 30 work. Also the prepared catalyst has been studied to show soft magnetism and can show its application to be used for preparing sensor devices as well.…”

PEG1000-Based Dicationic Acidic Ionic Liquid/Solvent-Free Conditions: An Efficient Catalytic System for the Synthesis of Bis(Indolyl)methanes

“…Among all the types of developed ILs, PEG-DAILs [19][20][21][22][23][24][25][26][27][28] have been researched as excellent and powerful catalysts for various organic synthetic reactions. To the best of our knowledge, there have been no reports on the application of PEG 1000 -DAIL as acid catalysts for the synthesis of bis(indolyl)methanes.…”