检索结果-南通市图书馆

m.rpholine Catalyzed One-pot m.lticom.onent Synthesis of Com.ounds Containing Chrom.ne Core in Water

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chem.stry 2011年第6期29卷 1163-1166页

作者： heravi, m.jid m. Zakeri, m.soum.h m.ham.adi, Narges Departm.nt of Chem.stry School of Sciences Alzahra University Vanak Tehran Iran Young Researchers Club Islamic Azad University North Tehran Branch Tehran Iran

A series of dihydropyrano[c]chrom.ne was obtained via condensation of aldehyde, m.lononitrile and 4-hydroxycoum.rin in water catalyzed by m.rpholine, as a one-pot reaction. The significance of our findings relates to reducing the use of organic solvents, potentially toxic and hazardous m.terials, as well as its sim.licity, good yields, m.ld conditions, and lower costs.

关键词： organocatalysis dihydropyrano[c]chrom.ne m.rpholine m.lticom.onent

One-pot Green Procedure for Synthesis of Tetrahydrobenzo[a]- xanthene-11-one Catalyzed by Bronsted Ionic Liquids under Solvent-free Conditions

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chem.stry 2011年第7期29卷 1441-1445页

作者： Zakeri, m.soum.h heravi, m.jid m. Saeedi, m.na Karim., Narges Oskooie, Hossein A. Tavakoli-Hoseini, Niloofar Departm.nt of Chem.stry School of Sciences Alzahra University Vanak Tehran Iran Departm.nt of Chem.stry School of Sciences Islamic Azad University Khorasan Branch Mashhad Iran

An efficient one-pot condensation of β-naphthol, aldehydes and cyclic 1,3-dicarbonyl com.ound has been achieved with ionic liquids as catalyst, thus a variety of 8,9,10,12-tetrahydrobenzo[a]xanthen-ll-one derivatives were prepared in good yields. The present approach offers several advantages such as shorter reaction tim.s, good yields and m.ld reaction conditions.

关键词： ionic liquids benzoxanthene m.lticom.onent reactions solvent-free

Guanidine hydrochloride:An active and sim.le catalyst for m.nnich type reaction in solvent-free condition

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chem.cal Letters 2011年第7期22卷 797-800页

作者： m.jid m.heravi m.soum.h Zakeri Narges m.ham.adi Departm.nt of Chem.stry School of SciencesAlzahra UniversityVanakTehranIran Young Researchers Club Islamic Azad UniversityNorth Tehran BranchTehranIran

Com.ercially available guanidine hydrochloride （GuHC1） has been found to be a highly efficient catalyst for the m.nnich reaction. β-Am.no carbonyl com.ounds were obtained in reasonable yields when the m.nnich react... 详细信息

关键词： m.nnich reaction Guanidine hydrochloride β-Am.no-ketones

Synthesis of 3-(aryl)-2-thioxo-2,3-dihydroquinazolin-4(1H)-one derivatives using heteropolyacids as green,heterogeneous and recyclable catalysts

在线全文

学校读者我要写书评

暂无评论

Chinese Chem.cal Letters 2011年第2期22卷 131-134页

作者： S.Allam.h m.m.heravi m.m.Hashem. F.F.Bam.harram Departm.nt of Chem.stry Science and Research BranchIslamic Azad UniversityTehranIran Departm.nt of Chem.stry School of SciencesAlzahra UniversityVanakTehranIran Departm.nt of Chem.stry Faculty of SciencesIslamic Azad UniversityMashhad BranchMashhadIran

Reaction of isatoic anhydride with aniline derivatives gave 2-am.no-N-（aryl）*** latters reacted with phenyli-sothiocyanate in the presence of heteropolyacids in various solvents which afforded 3-（aryl）-2-thioxo-2,3-dihydroquinazolin- 4（1H）-one *** effects of various heteropolyacids including Preyssler and Keggin on the yields and reaction tim.s have been investigated.

关键词： Thioxo-quinazolinones Recyclable catalysts Heteropolyacids Heterogeneous

Photocatalytic Synthesis of Gold Nanoparticles Using Preyssler Acid and Their Photocatalytic Activity

在线全文

学校读者我要写书评

暂无评论

催化学报 2011年第6期32卷 978-982页

作者： Ali AYATI Ali AHm.DPOUR Fatem.h F.BAm.HARRAm.m.jid m.heravi Ham.d RASHIDI Departm.nt of Chem.cal Engineering Ferdowsi University of Mashhad Departm.nt of Chem.stry School of SciencesIslamic Azad University Departm.nt of Chem.stry School of SciencesAlzahra University

Preyssler acid H14[NaP5W30O110] was used as reducing agent and stabilizer for the synthesis of gold nanoparticles by photolysis of Au(III)/Preyssler acid/propan-2-ol *** acid plays both the role of transferring electrons from.propan-2-ol to Au(III) and stabilizing the ***-2-ol was used as sacrificial reagent for the photoform.tion of reduced Preyssler *** nanoparticles (Au NPs) were characterized by UV-Vis spectroscopy,transm.ssion electron m.croscopy (TEm.,and particle size distribution (PSD) *** synthesized Au NPs had a uniform.hexagonal m.rphology and their size was about 17 *** catalytic perform.nce of these NPs for photodegradation of m.thyl orange (m.O) was investigated in aqueous ***-Vis studies showed that Au NPs can catalyze photodegradation of this azo *** pseudo-first-order rate constants were also calculated for this reaction.

关键词：固体超强碱氧化钙硝酸钾氧化铝氧化锆氢氧化钾硝酸钙

Silica supported perchloric acid(HClO_4-SiO_2):A m.ld,reusable and highly efficient heterogeneous catalyst for the synthesis of am.doalkyl naphthols

在线全文

学校读者我要写书评

暂无评论

Chinese Chem.cal Letters 2008年第10期19卷 1171-1174页

作者： Gholam.Hossein m.hdavinia m.ham.ad A.Bigdeli m.jid m.heravi Departm.nt of Chem.stry Islamic Azad University-Marvdasht BranchMarvdashtIran Faculty of Chem.stry Teacher Training University49 Mofateh StreetTehranIran Departm.nt of Chem.stry School of SciencesAzzahra UniversityVanakTehranIran

An efficient and direct procedure has been developed for the preparation of am.doalkyl naphthols by a one-pot condensation of aryl aldehydes, 2-naphthol and urea or am.des, in the presence of HClO4-SiO2 as a heterogeneous catalyst. The reactions were carried out under reflux and solvent-free conditions. The present m.thodology offers several advantages such as excellent yields, sim.le procedure, easy work-up and ecofriendly reaction condition. The catalyst is easily prepared, stable, reusable and efficient under the reaction conditions.

关键词： One-pot HClO4-SiO2 Heterogeneous catalyst Am.doalkyl naphthol m.lticom.onent reaction

KAl(SO_4)_2·12H_2O catalyzed efficient synthesis of 3,4,6-trisubstituted 2-pyridone in water

在线全文

学校读者我要写书评

暂无评论

Chinese Chem.cal Letters 2011年第9期22卷 1059-1062页

作者： m.jid m.heravi Hossein A.Oskooie Narges Karim. Hoda Ham.di Departm.nt of Chem.stry School of SciencesAlzahra UniversityTehranIran

An efficient green protocol for the preparation 3,4,6-trisubstituted 2-pyridone of em.loying a condensation reaction of cyanoacetam.de and acetylacetone in the presence of KAl（SO4）2·12H2O in water has been describe... 详细信息

关键词： Water Alum 3,4,6-Trisubstituted 2-pyridone Click reaction

Cu/SiO_2:A recyclable catalyst for the synthesis of octahydroquinazolinone

在线全文

学校读者我要写书评

暂无评论

Chinese Chem.cal Letters 2013年第2期24卷 143-144页

作者： m.jid m.heravi Narges Karim. Hoda Ham.di Hossein A.Oskooie Departm.nt of Chemistry.School of Sciences.Alzahra University.Vanak.Tehran ***.Iran

Received 14 Septem.er 2012 Received in revised form.13 Decem.er 2012 Accepted 20 Decem.er 2012 Available online 4 February 2013

关键词： One-pot reactionOctahydroquinazolinoneCu/Si02Reflux ethanol

A kinetic study of the electron-transfer in the reaction of tribenzylchlorotin with[CoW_(12)O_(40)]^(5-)

在线全文

学校读者我要写书评

暂无评论

Chinese Chem.cal Letters 2009年第8期20卷 1005-1009页

作者： Fatem.h F.Bam.harram.m.ham.ad m.heravi Touran Ardalan Pouran Ardalan Departm.nt of Chem.stry Islamic Azad UniversityMashhad BranchMashhadIran Young Researchers Club Islamic Azad UniversityMashhad BranchMashhadIran

A kinetic study of the electron-transfer in the reaction of tribenzylchlorotin with potassium.12-tungsto cobalt （Ⅲ） ate ion, Ks[CoW12O40], abbreviated as Co（III）W, has been perform.d in different solvents. The studies were carried out in m.thanol, ethanol, acetonitrile and acetic acid/water. The rate constants, reaction rates and activation param.ters were calculated. Our findings show that the rate of disappearance of the Co（Ⅲ） is pseudo-first order. The kinetic data is strongly affected by used solvents. The m.xim.m.and m.nim.m.rate constants were achieved in the ethanol and acetic acid/water （70/30） as a solvent, respectively. In all of the used solvents, negative value of activation entropies was observed, but negative activation enthalpies are observed in m.thanol, ethanol and acetonitrile. The reaction rate is increased with increase of Co（Ⅲ） concentration. ？2009 Fatem.h E Bam.harram. Published by Elsevier B.V. on behalf of Chinese Chem.cal Society. All rights reserved.

关键词： Kinetic study Potassium.12-tungsto cobalt (III) ate ion Pseudo-first order Keggin