Ionic Liquid-assisted Preparation of Two-dimensional ZnO/Fe3O4 Nano-composites and their Application in Polysubstituted Pyrroles Synthesis.

Aims And Objective: Ionic liquids are a suitable medium for stabilization and preparation of catalytic systems.

Materials And Methods: The two-dimensional (2D) ZnO/Fe3O4 nanocomposites were synthesized using ionic liquid [OMIM]Br as a stabilizer and soft template. The nanocomposites were characterized via FTIR, XRD, VSM and SEM analysis.

Synthesis and characterization of nano fibrillated cellulose/CuO films; micro and nano particle nucleation effects.

Cubic, truncated cubic and spherical nano and micro particles of CuO, can be selectively deposited onto nano fibrilated cellulose gels by the modulated alkaline reduction of Cu ions aided by the cellulose's reducing end groups. The role of the cellulose's reducing end groups and that of externally added carbohydrate reducing agents, towards inducing various CuO morphologies, is discussed with respect to the detailed nucleation effects leading to micro and nano CuO particle deposition on NFC. When the reducing end groups are provided only by the cellulose's chain ends, supersaturation effects seem to be affecting the CuO nucleation mechanism.

Ultrasound assisted polyacrylamide grafting on nano-fibrillated cellulose.

Polyacrylamide has been grafted onto nanofibrillated cellulose (NFC-g-PAM) under mild conditions. This was accomplished by developing and optimizing an ultrasound assisted protocol in the presence of potassium persulfate initiator. The synthesis was optimized on the basis of maximizing grafting percentage and grafting efficiency by varying the initiator and monomer concentration.

Ultrasonic Assisted Synthesis of Chromenes Catalyzed by Sodium Carbonate in Aqueous Media.

A simple, efficient, and environmentally benign procedure for the synthesis of 2-amino-4H-chromene ring has been achieved by the three-component reaction of an aromatic aldehyde, malononitrile and diverse enolizable C-H activated compound under ultrasound irradiation using sodium carbonate as a catalyst in aqueous media. Sodium carbonate as a natural salt, being available as an inexpensive catalyst combined with ultrasound method promoted this protocol in comparison to other methods and catalysts.

CuO nanostructures: optical properties and morphology control by pyridinium-based ionic liquids.

Copper oxide nanostructures have been synthesized by a simple reflux method in aqueous medium of pyridinium based ionic liquids. The structural and optical properties of CuO nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence spectroscopy (PL) and UV-visible. The morphologies of the nanostructures can be controlled by changing the amount of NaOH and ionic liquids.

A highly efficient green synthesis of N-alkyl 2-[(2-oxo-2-aryl ethyl) amino] benzamide derivatives from reaction of isatoic anhydride, primary amines and 2-bromoacethophenone.

N-alkyl 2-[(2-oxo-2-aryl ethyl)amino] benzamide derivatives have been synthesized in high yields. This involves three-component reaction of isatoic anhydride, primary amines in the presence of 2-bromoacethophenone derivatives. The reaction workup is simple and the products can be easily separated from the reaction mixture.

A simple and effective approach to the synthesis of isoquinoline derivatives under solvent-free conditions.

An efficient synthesis of dialkyl pyrrolo[2,1-a]isoquinoline-2,3-dicarboxylates, pyrrolo[1,2-a]quinoline-1,2- dicarboxylates and indolizines is described via one-pot reactions of isoquinoline, quinoline or pyridine and phenacyl bromids with dialkyl acetylenedicarboxylates or diaryloylacetylene under solvent-free conditions at 50°C. The mild reaction conditions and high yields of the products exhibit the good synthetic advantage of these methods.

A rapid, four-component synthesis of functionalized thiazoles.

An efficient synthesis of 2-(dialkylamino)-4-phenyl)-1,3-thiazol-5-yl)(phenyl)methanone using acid chlorides, secondary amines, 2-bromoacethophenone and ammonium thiocyanate is described.

Synthesis of functionalized chromenes from Meldrum's acid, 4-hydroxycoumarin, and ketones or aldehydes.

An efficient synthesis of 4-alkyl-4-methyl-3,4-dihydro-2H,5H-pyrano[3,2-c]chromene-2,5-dione or 4-aryl-3,4-dihydro-2H,5H-pyrano[3,2-c]chromene-2,5-diones via reaction 4-hydroxycoumarin with Meldrum's acid and ketones or aldehydes is described.

Synthesis of functionalized 1,2,4-triazole-3-thiones from ammonium isothiocyanate, acid chlorides, and arylhydrazines.

An efficient synthesis of 1-aryl-5-aryl(alkyl)-1,2-dihydro-3H-1,2,4-triazole-3-thiones via reaction between ammonium thiocyanate, acid chlorides, and arylhydrazines is described.

A one-pot synthesis of functionalized thiazoles from acid chlorides, secondary amines, ethyl bromopyruvate, and ammonium thiocyanate.

An efficient one-pot synthesis of ethyl 2-(4-aryl-2-dialkylamino-1,3-thiazole-5-yl)-2-oxoacetates using acid chlorides, secondary amines, ethyl bromopyruvate, and ammonium thiocyanate is described.

Efficient synthesis of alkyl 2-[2-(arylcarbonylimino)-3-aryl-4-oxo-1, 3-thiazolan-5-ylidene]-acetates.

Reaction of 1-aryl-3-arylcarbonylthioureas with dialkyl acetylenedicarboxylates in CH(2)Cl(2) at room temperature leads to alkyl 2-[2-(arylcarbonylimino)-3-aryl-4-oxo-1,3-thiazolan-5-ylidene]-acetates in good yields.

Reaction between alkyl isocyanides and isopropylidene Meldrum's acid in the presence of bidentate nucleophiles.

The reaction between alkyl isocyanides and isopropylidene Meldrum's acid in the presence of 1,2-ethanediol leads to N (1)-(alkyl)-2-(5,7-dioxo-1,4-dioxepane-6-yl)-2-methylpropanamides. 1,3-Propanediol or 1,4-butanediol produce hydroxyalkyl 1-(tert-butyl)-4,4-dimethyl-2,5-dioxo-3-pyrrolidinecarboxylates. When the reaction was performed in the presence of catechol, bis(2-hydroxyphenyl) 2-[2-(tert-butylamino)-1,1-dimethyl-2-oxoethyl]malonate was obtained.

Synthesis of functionalized 5-imino-2,5-dihydro-furans through the reaction of isocyanides with activated acetylenes in the presence of ethyl bromopyruvate.

The reaction between alkyl(aryl) isocyanides and dibenzoylacetylene in the presence of ethyl bromopyruvate leads to ethyl 3,4-dibenzoyl-2-bromomethyl-5-alkyl(aryl)imino-2,5-dihydro-furan-2-carboxylates in high yields. Dialkyl acetylenedicarboxylates react with tert-butyl isocyanide and ethyl bromopyruvate to produce 3,4-dialkyl 2-ethyl 2-bromomethyl-5-tert-butylimino-2,5-dihydro-furan-2,3,4-tricarboxylates.