[PDF] Top 20 El Proceso Histórico de Regionalización Del Perú
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Synthesis of 2, 4, 6-Triaryl Pyridines under Solvent Free Condition
... under solvent free condition (Scheme.1 ). High yield (97%) was obtained with benzaldehyde and acetophenone. To evaluate the scope and limitations of the methodology, reactions were carried out ... See full document
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An ultrasonic assisted multicomponent reaction for the synthesis of 3, 4 dihydropyrimidin 2(1H) ones under solvent free condition
... the synthesis of 3, 4-dihydropyrimidin- 2(1H)-ones (Biginelli reaction) by condensation of various substituted benzaldehydes, Diketone/ β-ketoester and urea/ thiourea, at ambient temperature promoted ... See full document
8
An efficient one pot synthesis of 2, 4, 6 triaryl pyridines and their in vitro antimicrobial activity
... efficient synthesis of 2,4,6-triaryl pyridines is described by the one-pot condensation of substituted acetophenones, 1-phenyl-3-(4’-hydroxy/chloro phenyl) pyrazol-4- carboxaldehyde, ... See full document
97
An efficient synthesis of 2,4,6 triaryl pyridines and their biological evaluation
... the synthesis of 2,4,6 triaryl pyridines by the one-pot condensation of 4,4’-difluoro chalcone, substituted acetophenones and ammonium acetate in glacial acetic ...the 2- and ... See full document
187
Nano-SbCl5/SiO2 as an Efficient Catalyst for One-Pot Synthesis of 2, 4, 5-Trisubstituted Imidazoles Under Solvent- Free Condition
... of 2, 4, 5-trisubstituted imidazoles by means of a multi-component condensation of an aldehydes, benzil and ammonium acetate in one .../SiO 2 , along with heterogeneous ... See full document
128
Synthesis of 2-Amino-4H-chromene Derivatives under Solvent-Free Condition Using MOF-5
... compounds. 2-Amino-4H- chromene are an important class of heterocyclic compounds having important biological activities such as antiviral [1], antimicrobial [2], antiproliferative [3], mutagenic [4], ... See full document
8
Synthesis of new phenanthro imidazole derivatives in solvent free condition
... weakens the activity of the carbonyl group of aromatic ring of benzaldehyd, therefore, the aromatic ring with Electron-Donating Substituents that does not affect the attack of ammonium acetate well. In all cases, that ... See full document
8
A convenient one-pot synthesis of Series of 1, 5-Benzodiazepine Derivatives under Solvent free Condition
... disorder, 4 Some benzodiazepine derivatives are used in fine chemical industries such as photographical dyes for acrylic fiber, 5 they are also utililized in the synthesis of fused ring benzodiazepines ... See full document
14
A Rapid and Efficient Microwave Assisted Synthesis of 2 Arylbenzoxazoles by Using 1,3 Dibromo 5,5 Dimethylhydantoin (DBH) Under Solvent Free Condition
... the synthesis of 2-arylbenzoxazoles can proceed by two ...of 2-aminophenols with carboxylic acid derivatives, which is either catalyzed by strong acids [8] or requires microwave conditions or ... See full document
7
An efficient One pot Synthesis of 1, 4 Dihydropyridine Derivatives under Solvent free Condition
... of synthesis of mono functional 1,4 DHP’S derivatives and the bi functional 1,4 DHP’S are seldom ...C 2 ,C 6 positions (c)and an aromatic substitute at position at C 4 (d)amide or ester groups ... See full document
14
Synthesis of β-enaminones Catalyzed by In/AlMCM-41 Under Microwave Irradiation and Solvent-free Condition
... Furthermore, we studied the effect of microwave irradiation power with same model reaction. Here, we have kept the concentration of catalyst constant varied the power inputs from 150-600W. The observation reveals that ... See full document
28
Microwave assisted synthesis of 6 methyl 1,2,3,4 tetrahydro N aryl 2 oxo 4 arylpyrimidine 5 carboxamide and 3, 4 dihydropyrimidin 2(1H) ones under solvent free conditions
... from internal tetramethylsilane and are given on the δ scale. Mass spectral data were obtained with a JEOL D-300 (EI) mass spectrometer. Elemental analyses were carried out on a Heraeus CHN-O-Rapid analyzer. All ... See full document
7
Solvent free synthesis of alkyl 2 (dialkylamino) 4 phenylthiazole 5 carboxylates derivatives and in vitro antimycobacterial activity of these compounds against Mycobacterium smegmatis
... the Synthesis of the Solvent free Alkyl 2-(Dialkylamino)-4 phenylthiazole-5-carboxylates derivatives and the evaluation of their in vitro anti mycobacterial activities against ... See full document
191
One Pot Synthesis of Imidazolidine 2 Thiones, Hydantoins and Thiohydantoins under Solvent Free and Grinding Conditions
... The imidazolidine-2,4-dione (hydantoin) and 2-thioxoimidazolidin-4-one (thiohydantoin) are a common 5- membered ring containing a reactive cyclic urea or thiourea core. They have a number of biological ... See full document
158
P2O5/Al2O3 as an effieient catalyst for one-pot synthesis of polyhydroquinoline derivatives under solvent-free conditions
... tothe synthesis of polyhydroquinolines because of itshighly absolute biological and physiological activities such as calcium channel blockers, asodilator, hepatoprotective, anti atherosclerotic, bronchodilator, ... See full document
18
IONIC LIQUIDS –CATALYZED A GREEN SYNTHESIS OF 3, 4 DIHYDROPYRIMIDIN 2 (1H) ONES UNDER SOLVENT FREE CONDITIONS
... [1, 2] Ionic liquids (ILs) have attracted more and more attentions as the green reaction medium alternative to organic solvents for their low volatility, negligible vapour pressure, reasonable thermal stability, ... See full document
15
COMPARATIVE STUDY OF SYNTHESIS OF 2, 4, 5 TRIARYL SUBSTITUTED IMIDAZOLES UNDER SOLVENT FREE CONDITIONS USING DIFFERENT LEWIS ACIDS AS CATALYSTS
... 2477 histidine and its decarboxylation metabolite histamine. [3] To design and conduct chemical reaction with “green” experimental protocol is an enormous challenge that chemists have to confront to improve the quality ... See full document
111
Synthesis and Antifungal Activity of 2-(4’substitutedanilinosydnon-3’-Yl) Pyridines
... on addition of bromine (0.9g, 0..005 mol) in ethanol (25 ml). The reaction mixture was stirred further for 30 min and diluted with water (200 ml). The solid thus obtained was filtered and recrystallised.M.P. 198°C; Yield ... See full document
16
Efficient Solvent Free Preparation of Imines, and Their Subsequent Oxidation with m CPBA to Afford Oxaziridines
... as solvent: In a 50-mL round-bottom flask provided with magnetic stirring and a reverse Dean-Stark trap were placed ...h under reflux and then the mix- ture was cooled to 0˚C before the slow addition of ... See full document
23
A straightforward metal free synthesis of 2 substituted thiazolines in air
... General procedure for the preparation of 2-subtituted thiazolines: In air, a vial was charged with the nitrile (1 mmol), cysteamine hydrochloride (1.5 mmol) and NaOH (0.2 mmol). The reaction was stirred at 80 °C ... See full document
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