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Oxidation of o-chloro and o-hydroxy benzyl alcohols catalyzed by copper (II) tetraphenylporphyrin nanoparticles synthesized by mixed solvent method
, Pages 101-108 Rahmatollah Rahimi, Ensieh Gholamrezapor, Mohammad Reza Naimi-Jamal, Mahboubeh Rabbani PDF (212 K) |
Abstract: Tetraphenylporphyrin (TPP) and copper tetraphenylporphyrin (CuTPP) were synthesized and characterized by IR, UV-Vis, 1HNMR and 13CNMR. The CuTPP nanoparticles were synthesized by sonication and mixed solvent methods. These nanoparticles were characterized by AFM and SEM images and UV-Vis spectra. The catalytic activity of nanoparticles was investigated by oxidation of o-choloro and o-hydroxy benzyl alcohols in presence of molecular oxygen and isobutyraldehyde. The yields of oxidation of o-hydroxy benzyl alcohol by the two catalysts, CuTPP NPs and CuTPP, are 96.5% and ~ 2%, respectively. It is very obvious that the oxidation at the presence of CuTPP NPs catalyst is very high but selectivity for both reactants is 100%. DOI: 10.5267/j.ccl.2012.6.003 Keywords: Copper (II) tetraphenylporphyrin, Nanoparticles, Molecular oxygen, Benzyl alcohol, Oxidation |
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BF3.SiO2: an efficient catalyst for the synthesis of azo dyes at room temperature
, Pages 109-114 Bi Bi Fatemeh Mirjalili Abdolhamid Bamoniri and Ali Akbari PDF (132 K) |
Abstract: A rapid one-pot method has been developed for the synthesis of azo dyes via sequential diazotization–diazo coupling of aromatic amines with coupling agents at room temperature in the presence of BF3.SiO2 as acidic catalyst. The obtained aryl diazonium salts bearing silica supported boron tri-flouride counter ion was sufficiently stable to be kept at room temperature in the dry state. DOI: 10.5267/j.ccl.2012.6.002 Keywords: Azo dye, BF3.SiO2, Stable diazonium salts Diazotization, Lewis acid |
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Regioselective one-pot, three component synthesis of ethyl 6-aryl-3-propylpyridazine-4-carboxylates in water
, Pages 115-122 Jabbar Khalafy Mehdi Rimaz and Mahnaz Ezzati PDF (136 K) |
Abstract: A regioselective synthesis of ethyl 6-aryl-3-propylpyridazine-4-carboxylates by one-pot three-component reaction of ethyl butyrylacetate with various arylglyoxals in the presence of hydrazine hydrate at room temperature in water was described. DOI: 10.5267/j.ccl.2012.6.001 Keywords: Pyridazine, Arylglyoxal, Hydrazine, Regioselective |
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Cesium carbonate mediated exclusive dialkylation of active methylene compounds
, Pages 123-132 Ulaganathan Sankar, Chandran Raju and Ramakrishnan Uma PDF (195 K) |
Abstract: Active methylene compounds are regioselectively dialkylated by variety of alkyl halides using cesium carbonate in quantitative yield. The reaction yielded exclusively dialkylated products with no intermediate monoalkyaltion or mixture of products. DOI: 10.5267/j.ccl.2012.5.003 Keywords: Balanced base Aprotic solvent Active methylene compounds Reactive halides Complete conversion |
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Brønsted acid-surfactant (BAS) catalysed cyclotrimerization of aryl methyl ketone
, Pages 133-138 Kiran Phatangare, Vikas Padalkar, Kaliyappan Murugan and Atul Chaskar PDF (238 K) |
Abstract: A brønsted acid-surfactant catalysed and simple, mild, metal catalyst free and chemo-selective method has been developed for synthesis of 1, 3, 5-triaryl benzenes from aryl methyl ketones. The advantages of this protocol subsume green and sustainable reaction medium, mild reaction conditions, easy product recovery and its good yields. DOI: 10.5267/j.ccl.2012.5.001 Keywords: 1, 3, 5-Triaryl benzenes, Aryl methyl ketones, Brønsted acid-surfactant catalyst (BASC), Dodecylbenzenesulfonic acid (DBSA) |
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The synthesis of 2-arylquinoxaline derivatives
, Pages 139-146 Jabbar Khalafy Bayram Parsa Habashi, Ahmad Poursattar Marjani and Peyman Najafi Moghadam PDF (149 K) |
Abstract: A series of new 2-arylquinoxaline derivatives have been synthesized in high yield by condensation of aryl-1,2-diamines with arylglyoxals in DMF at 50-120 oC. DOI: 10.5267/j.ccl.2012.5.002 Keywords: Arylquinoxalines, arylglyoxals, 1,2-diaminobenzene derivatives |
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