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ABSTRACT: Some N-aminotriazines and -triazoles were treated with Preyssler’s anion as catalyst in acetic acid to afford the corresponding deaminated triazines and triazoles. The reaction is suggested
to proceed via formation of N-nitrosamines with subsequent N–NO bond cleavage.
Monatshefte fuer Chemie/Chemical Monthly 04/2012; 139(2):107-110. · 1.53 Impact Factor
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ABSTRACT: Wells-Dawson heteropolyacid (H6P2W18O62 · 24H2O) was used as an effective catalyst for the synthesis of biologically active quinoxaline derivatives from the condensation
of o-phenylenediamines with 1,2-dicarbonyl compounds at room temperature in excellent yields.
Monatshefte fuer Chemie/Chemical Monthly 04/2012; 138(5):465-467. · 1.53 Impact Factor
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ABSTRACT: Recent developments in the synthesis of nanoparticles using polyoxometalates (POMs) are reviewed. This review demonstrates the importance and various roles of POMs in developing of nanotechnology. Special attention has been paid to the synthesis of silver, gold, selenium, cadmium sulfide, palladium, and calcium carbonate nanoparticles using POMs.
Synthesis and Reactivity in Inorganic Metal-Organic and Nano-Metal Chemistry 02/2012; Metal-Organic(and Nano-Metal Chemistry):209-230. · 0.47 Impact Factor
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ABSTRACT: This article may be used for research, teaching, and private study purposes. Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden. The publisher does not give any warranty express or implied or make any representation that the contents will be complete or accurate or up to date. The accuracy of any instructions, formulae, and drug doses should be independently verified with primary sources. The publisher shall not be liable for any loss, actions, claims, proceedings, demand, or costs or damages whatsoever or howsoever caused arising directly or indirectly in connection with or arising out of the use of this material.
Synthesis and Reactivity in Inorganic Metal-Organic and Nano-Metal Chemistry 01/2011; 41:1221. · 0.47 Impact Factor
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Chinese Journal of Catalysis 01/2011; 32(5):782-788. · 1.17 Impact Factor
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ABSTRACT: 10 An efficient, improved, and environmentally benign procedure Q1 for catalytic oxidation of benzyl alcohols to the corresponding ben-zaldehdes was developed in the presence of nano-SiO 2 -supported 15 Preyssler heteropolyacid (HPA), both in thermal conditions and under microwave irradiation. Silica nanostructures were obtained through a sol–gel method and were characterized by transmission electron microscopy and powder x-ray diffraction. Nano-SiO 2 -supported Preyssler HPA was synthesized by an impregnation 20 method and confirmed by infrared spectroscopy. In catalytic re-actions, the effects of various parameters such as catalyst loading, catalyst amount, temperature, and reaction time were studied and the optimum conditions were obtained. INTRODUCTION The recent advances in nanotechnology, particularly when coupled with modifying of organic reactions, have opened new avenues for catalytic technology. As an example to explain its
Synthesis and Reactivity in Inorganic Metal-Organic and Nano-Metal Chemistry 01/2011; 14(41):1-8. · 0.47 Impact Factor
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Green Chemistry Letters and Reviews 12/2010; 3(4):263-267. · 0.98 Impact Factor
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ABSTRACT: An efficient and improved procedure for the synthesis of benzopyran derivatives has been achieved with Keggin-type and Preyssler-type heteropolyacids (HPA) catalysts in one-pot reaction under solvent-free conditions.
Synthesis and Reactivity in Inorganic. 11/2010; Metal-Organic(and Nano-Metal Chemistry):916-921.
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ABSTRACT: In this work, a rapid and efficient one-pot method for the synthesis of indeno[1,2-b]quinoline-7-one derivatives by condensation of 1-naphthylamine, 1,3-indanedione, and different aldehydes in the presence of H6P2W18O62·18H2O as a green and reusable catalyst in refluxing acetic acid is described.
Synthetic Communications 08/2010; 40(16):2402-2406. · 1.06 Impact Factor
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ABSTRACT: 6,8-Dimethyl-3-aryl-[1,2,4]triazolo[3,4-b][1,3,4]thiazepine derivatives were synthesized by cyclodehydration of 3-aryl-4-amino-5-mercapto-1,2,4-triazole with 2,4-pentanedione in the presence of a catalytic amount of Preyssler catalyst under very mild conditions.
Synthetic Communications 06/2010; 40(12):1778-1783. · 1.06 Impact Factor
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ABSTRACT: Three-component, one-pot synthesis of 4,6-diarylpyrimidin-2(1H)-ones and 9-phenyl-8-oxa-10,12-diaza-tricyclo[7.3.1.02,7]trideca-2(7),3,5-trien-11-one by condensing acetophenone derivatives, aldehydes, and urea in the presence of trimethylsilyl chloride using a catalytic amount of H6P2W18O62-18H2O under solvent-free conditions is reported.
Synthetic Communications 05/2010; 40(9):1256-1263. · 1.06 Impact Factor
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Chinese Journal of Chemistry 03/2010; 28(2):299 - 302. · 0.75 Impact Factor
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ABSTRACT: 4-Aminoquinazolines were synthesized in good yields via a one-pot, three-component reaction of anthranilonitrile, acylchlorides, and ammonium acetate in the presence of catalytic amounts silica-supported Preyssler nanoparticles under refluxing conditions.
Synthetic Communications 03/2010; 40(6):861-867. · 1.06 Impact Factor
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ABSTRACT: Reaction of aldehydes and 4-hydroxycoumarin in the presence of catalytic amount of silica-supported Preyssler nanoparticles led to synthesis of bis-coumarins in excellent yields.
Synthetic Communications 02/2010; 40(4):498-503. · 1.06 Impact Factor
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ABSTRACT: Photocatalytic oxidation of aromatic aldehydes to related carboxylic acids was investigated with molecular oxygen in the presence of Preyssler anion, with formula [NaP5W30O110]14 −. It was observed that H14[NaP5W30O110] could catalyze the oxidation of aromatic aldehydes by molecular oxygen under homogeneous conditions as well as supported on silica in heterogeneous conditions. Also, for further studies, we have investigated the application of Preyssler catalyst in the presence of hydrogen peroxide as oxidizing agent. Our findings showed that this catalyst is very active in the presence of hydrogen peroxide and UV light. The effects of catalyst concentration, time and loading percentage have been studied.
Synthesis and Reactivity in Inorganic. 12/2009; Metal-Organic(and Nano-Metal Chemistry):746-750.
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Synthetic Communications 11/2009; 39(22):4109-4116. · 1.06 Impact Factor
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Green Chemistry Letters and Reviews Vol. 2. 09/2009; No. 1(March 2009):35-41.
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ABSTRACT: Preyssler acid as bulk form, H 14 [NaP 5 W 30 O 110 ] and silica-supported with different loadings used as green, eco-friendly and recyclable photocatalysts for catalytic oxidation of benzyl alcohols to the corresponding aldehyds under O 2 and H 2 O 2 . High selectivity and moderate to excellent yields were obtained. Silica-supported Preyssler were less active than the bulk form under the same conditions. Our findings showed that the catalyst concentration, time, loading percentage, and amount of the catalyst are important factors.
Synthesis and Reactivity in Inorganic. 09/2009; Metal-Organic(and Nano-Metal Chemistry):394-399.
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ABSTRACT: Bis(indolyl)alkanes have been synthesised in excellent yields in the presence of catalytic amount of silica-supported Preyssler nano particles as green, reusable and efficient catalyst under ultra sonic irradiation.
Ultrasonics Sonochemistry 05/2009; 16(6):718-20. · 3.57 Impact Factor
