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Ultrasound Irradiation (ultrasound + irradiation)
Selected AbstractsChemInform Abstract: Straightforward Functionalization of 3,5-Dichloro-2-pyrazinones under Simultaneous Microwave and Ultrasound Irradiation.CHEMINFORM, Issue 19 2010Davide Garella Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Facile Reaction of Thiols and Amines with Alkyl 4-Hydroxy-2-alkynoates in Water under Neutral Conditions and Ultrasound Irradiation.CHEMINFORM, Issue 32 2009Antonio Arcadi Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] Improved Synthesis of Benzotriazoles and 1-Acylbenzotriazoles by Ultrasound Irradiation.CHEMINFORM, Issue 31 2007Claudio M. P. Pereira Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] BiOClO4×xH2O and Bi(OTf)3 as Efficient and Environmentally Benign Catalysts for Synthesis of Bis(indolyl)methanes in Solution and under Ultrasound Irradiation.CHEMINFORM, Issue 18 2007Iraj Mohammadpoor-Baltork Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Facile Synthesis of 3,3-Di(heteroaryl)indolin-2-one Derivatives Catalyzed by Ceric Ammonium Nitrate (CAN) under Ultrasound Irradiation.CHEMINFORM, Issue 24 2006Shun-Yi Wang Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Pinacol Coupling of Aromatic Aldehydes and Ketones Using TiCl3,Al,EtOH under Ultrasound Irradiation.CHEMINFORM, Issue 18 2005Ji-Tai Li No abstract is available for this article. [source] Reduction of Carbonyl Compounds with NaBH4 under Ultrasound Irradiation and Aprotic Condition.CHEMINFORM, Issue 41 2004Behzad Zeynizadeh Abstract For Abstract see ChemInform Abstract in Full Text. [source] A Facile Synthesis of ,,,,-Bis(Substituted Benzylidene) Cycloalkanones Catalyzed by KF/Al2O3 under Ultrasound Irradiation.CHEMINFORM, Issue 46 2003Ji-Tai Li Abstract For Abstract see ChemInform Abstract in Full Text. [source] ChemInform Abstract: Application of Ultrasound Irradiation for the Reactions of N-Hydroxymethylation.CHEMINFORM, Issue 1 2001Wujun Zhong Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] An Efficient Combined Electrochemical and Ultrasound Assisted Synthesis of Imidazole-2-ThionesADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 13 2009Marta Feroci Abstract The electrochemical reduction of 1,3-dialkylimidazolium ionic liquids gave the corresponding N-heterocyclic carbenes that, after reaction with elemental sulfur and ultrasound irradiation, yielded 1,3-dialkylimidazole-2-thiones in very high yields. The reaction is very clean, produces no side-products and avoids the use of any other added reagent. [source] Study on bulk polymerization of methyl methacrylate initiated by low intensity ultrasonic irradiationJOURNAL OF APPLIED POLYMER SCIENCE, Issue 6 2010Sude Ma Abstract Methyl methacrylate (MMA) was polymerized in bulk solutions using low intensity ultrasonic radiation of 0.25 W/cm2. The polymerization occurred after 1 h of irradiation time was applied. The polymerization rate was greatly accelerated either by increasing the amount of poly (methyl methacrylate) (PMMA) granular added into the system or by elongating the irradiation time. However, it was found that the reaction rate increased with the decreasing of the ultrasonic frequencies when the exposure time of the polymerization under the irradiation was less than 3 h. Experimental results verified that the polymerization was initiated by free radicals, which were mainly generated from the degradation of PMMA macromolecular chains, the friction between the polymer macromolecular chains and the solvent monomer. These findings were obviously different from those obtained when high intensity ultrasonic irradiation was used. The polymers fabricated in this study by using ultrasound irradiation have a narrower molecular weight distribution compared to those obtained from the polymerizations induced by the conventional initiators. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 [source] Combining microwave and ultrasound irradiation for rapid synthesis of nanowires: a case study on Pb(OH)BrJOURNAL OF CHEMICAL TECHNOLOGY & BIOTECHNOLOGY, Issue 12 2009Xiao-Fang Shen Abstract BACKGROUND: One-dimensional (1D) nanostructures such as wires, tubes and belts have attracted much attention in recent years because of their fascinating properties and promising applications, and various methods have been developed to prepare 1D nanostructures. Microwave and ultrasound, two methodologies for rapid synthesis, have both been applied to fabricate nanostructures. This paper reports on combining microwave and ultrasound irradiation as a new strategy for rapid synthesis of nanowires. Using Pb(OH)Br as a study case, nanowires were rapidly synthesized under the combined irradiation. The use of the ionic liquid 1-butyl-3-methylimidazolium bromide as a structure-directing agent and microwave absorbent significantly simplified the preparation procedure. RESULTS: Combined microwave,ultrasound irradiation at (50 W,50 W) greatly reduced the reaction time (10 min) and significantly increased the product yield (45.0%) in comparison with conventional heating (24 h reaction time, 23.0% yield). Combined microwave,ultrasound irradiation at (50 W,50 W) also changed the resultant wires from 20,30 µm diameter and 2,3 mm long to 80,800 nm and 50,100 µm, respectively. Further increase in power of the combined irradiation (250 W,50 W) led to a dramatic reduction in the reaction time (80 s) with a slightly increased yield of 48.2%. CONCLUSIONS: The obvious advantages of combined microwave,ultrasound irradiation are marked improvement of the product yield, significant enhancement of reaction rate and increased aspect ratio of the 1D structure. Copyright © 2009 Society of Chemical Industry [source] Synthesis of 2-cyanoacrylates containing pyridinyl moiety under ultrasound irradiationJOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 6 2005Huiping Zhang Reaction of ethyl cyanoacetate with carbon disulfide and dimethyl sulfate in the presence of sodium methoxide in anhydrous methanol yields ethyl 2-cyano-3,3-dimethyl- thioacrylate, followed by the nucle-ophilic substitution with 2-amino-3-chloro-4- methylpyridine under ultrasonic irradiation affording the key intermediate, ethyl 3-(2-chloro-4-methylpyridin-3-ylamino)-2-cyano-3-methylthioacrylate. The title compounds were then obtained through the reaction of the key intermediate with the aliphatic amine under reflux condition. All the new structures were verified by elemental analysis, IR, 1H NMR and mass spectra. In the MTT test, these new compounds were found to possess moderate antitumor activities against PC3 and A431 cells. [source] | ||||||||||