نتایج جستجو برای: recyclable nanomagnetic catalyst

تعداد نتایج: 46263  

Journal: Journal of Nanoanalysis 2018

In this work, various 3-cyano-4-aryl-4H-pyran derivatives were prepared efficiently through a one-pot,multicomponent synthesis between aromatic aldehyde, malononitrile and acetophenone derivativesor ethyl acetoacetate using Fe3O4/EDTA magnetic nanocatalyst and ethanol as solvent. The reactionswere completed at room temperature in 10 min using 5 mg of catalyst and 2 mL of solvent to prepare1 mmo...

2012
Srinivasa Rao Jetti Divya Verma Shubha Jain

An environmentally benign green protocol for the synthesis of 5-unsubstituted 3,4-dihydropyrimidin-2(1H)-ones using Amberlyst 15 DRY as a recyclable catalyst has been developed. The use of resinous, nontoxic, thermally stable, and inexpensive Amberlyst 15 DRY, as a recyclable heterogeneous catalyst, makes the process simple with negligible chemical waste. Among the various solid acid catalysts ...

Journal: :organic chemistry research 0
neda ayashi chemistry department, collage of science, shahid chamran university of ahvaz, ahvaz, iran mehdi fallah-mehrjardi department of chemistry, payame noor university, tehran, 19395-4697, iran ali reza kiasat a chemistry department, collage of science, shahid chamran university of ahvaz, ahvaz, iran

the use of a recyclable phase transfer catalyst, sio2-peg-imbr, is demonstrated in a simple and highly efficient synthesis of phenacyl derivatives by nucleophilic substitution reaction of phenacyl halides with different anions in water. advantages of this system are easy work-up, moderate to good yields, and recyclable catalyst. the catalyst can be recycled and reused several times with no loss...

Journal: :Dalton transactions 2010
Tao Tu Xike Feng Zhixun Wang Xiyu Liu

A novel hydrophilic pyridine-bridged bis-benzimidazolylidene palladium pincer complex (3) acted as a highly efficient robust recyclable molecular catalyst towards Suzuki-Miyaura coupling reactions in aqueous media and tolerated various functional groups (even heterocycles) with extremely low catalyst loading.

Journal: :Dalton transactions 2014
Algin Oh Biying Venu R Vangala Chia Sze Chen Ludger Paul Stubs Narayan S Hosmane Zhu Yinghuai

Well-dispersed palladium(0) nanoparticles with small and narrow size distributions were synthesized conveniently on a graphene oxide (GO) surface. The GO-supported nano-Pd(0) was found to be a highly efficient and recyclable catalyst for the carbonylative cross-coupling reaction between arylboronic acids and aryl and carboranyl iodides, respectively. Benzophenone and a series of carboranylaryl ...

Journal: :journal of nanostructures 0
fariba sadri department of chemistry, payame noor university, tehran, iran ali ramazani department of chemistry, university of zanjan, zanjan, iran hamideh ahankar department of chemistry, abhar branch, islamic azad university, abhar, iran saeid taghavi fardood department of chemistry, university of zanjan, zanjan, iran pegah azimzadeh asiabi department of chemistry, university of zanjan, zanjan, iran mehdi khoobi department of medicinal chemistry, faculty of pharmacy and pharmaceutical sciences research center, tehran university of medical sciences, tehran, iran sang woo joo

nanomagnetic mgfe2o4 is an active, stable, and reusable catalyst for the oxidation of alcohols. the oxidation of various primary and secondary alcohols has been examined and related corresponding products were obtained in good yields. the reactions were carried out in the presence of water as solvent and oxone (at room temperature) or h2o2 (at 60 ºc) as an oxidant. the catalyst was investigated...

Journal: :iranian journal of catalysis 2015
ali ramazani fariba sadri abdolhossain massoudi mehdi khoobi sang woo joo

zinc ferrite (znfe2o4) nanoparticles were synthesized via the auto-combustion assisted sol-gel method of zn2+ and fe3+ ions (molar ratio 1:2) in ammonia solution. the prepared nanomagnetic catalyst was characterized by ir, xrd, sem and icp. the diameter of the znfe2o4 mnps (63.7 nm) was determined by debye-scherre equation via their xrd pattern. nanomagnetic znfe2o4 efficiently catalyzes oxidat...

Journal: :Chemical communications 2009
Kohji Suda Shin-Ichiro Nakajima Yasumi Satoh Toshikatsu Takanami

The metallophthalocyanine complex Cr(TBPC)OTf works as a highly efficient, recyclable Lewis acid catalyst for the regio- and stereoselective rearrangements of epoxides to aldehydes.

2015
Priyanka Srivastava Pratima Jain

An efficient and facile synthesis of fatty acid methyl esters (FAMEs) using sunflower oil and methanol has been carried out in the presence of a solid base Mg-Al-CO3 hydrotalcite heterogeneous catalyst. This protocol promotes the environment friendly conditions as the hydrotalcites are non toxic, recyclable, takes less reaction time and is easy to work up. The hydrotalcite showed high activity ...

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