[PDF] Top 20 Adaptación de Scrum como marco de trabajo aplicado al Enfoque por Competencias
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An efficient method for the catalyst-free one-pot green synthesis of 2,4,5-trisubstituted imidazoles in water
... three-component method to prepare a variety of trisubstituted imidazoles in the presence of DAHP in ...for green synthesis of a wide range of trisubstituted ...and water ... See full document
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Benzethonium Chloride Catalyzed one Pot Synthesis of 2,4,5-Trisubstituted Imidazoles and 1,2,4,5-Tetrasubstituted Imidazoles in Aqueous Ethanol As A Green Solvent
... 2,4,5- trisubstituted imidazoles were synthesized from benzil, ammonium acetate with various aldehydes, in the presence of 10 mol % benzethonium chloride in EtOH-water(1:1) mixture at reflux ... See full document
8
Nano kaolin-SO3H as a new efficient and reusable catalyst for one-pot synthesis of 2,4,5-trisubstituted imidazoles under solvent-free conditions
... acid catalyst for the promo- tion of many organic reactions ...of green chemistry, an environmentally benign procedure was designed for the one-pot synthesis of ... See full document
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One-pot Preparation of 2,4,5-Trisubstituted and 1,2,4,5-Tetrasubstituted Imidazoles Using Poly(4-vinylpyridinium Butane Sulfonic Acid) Hydrogen Sulfate, as an Efficient Heterogeneous Poly(ionic Liquid) Solid Acid Catalyst under Solvent-free Conditions
... All commercially available chemicals were purchased from Fluka and Merck companies and used without further purification. Poly(4-vinyl pyridine) cross-linked with 2% DVB ∼100-200 mesh, MW: 60,000 was ... See full document
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Sulfuric Acid Immobilized on Silica Gel as Highly Efficient and Heterogeneous Catalyst for the One Pot Synthesis of 2,4,5 Triaryl 1H imidazoles
... mild method to overcome these disadvan- tages still remains a challenge for organic ...chemists. One of the aims we have in mind is to introduce a new cata- lyst for synthesis of ... See full document
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BF3/nano-sawdust as a green, biodegradable and inexpensive catalyst for one-pot synthesis of tri-substituted imidazoles under solvent free conditions
... 2,4,5-trisubstituted imidazoles was explored using dierent aldehydes, benzil, and ammonium acetate (Table ...substituted imidazoles in higher yield than that of aliphatic ... See full document
5
An efficient one-pot synthesis of 2,4,5-trisubstituted imidazole catalysed by citric acid
... substituted imidazoles can act as fungicides, herbicides, plant growth regulators [3], antibacterial [4], antitumor [5] and glucagon receptors ...of green chemistry to some extent, when used ... See full document
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One pot synthesis of 2,4,5 trisubstituted imidazoles using cupric chloride as a catalyst under solvent free conditions
... an efficient method for the synthesis of 2,4,5- trisubstituted imidazole’s by one pot condensation of 1,2-dicarbonyl compound, aldehyde and ammonium acetate under microwave ... See full document
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One Pot Green Synthesis of Ag Decorated SnO2 Microsphere: an Efficient and Reusable Catalyst for Reduction of 4 Nitrophenol
... by one-pot hydrothermal ...ultra-pure water and stirred vigorously for 30 min to form a ...ultra-pure water, and then, ...for 5 min, the freshly prepared sil- ver–ammonia solution was ... See full document
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Nano-SbCl5/SiO2 as an Efficient Catalyst for One-Pot Synthesis of 2, 4, 5-Trisubstituted Imidazoles Under Solvent- Free Condition
... some trisubstituted imidazole derivatives. This method provides several advantages like simple work-up, environmentally benign, and shorter reaction times along with high ...nano catalyst was ... See full document
128
Ammonium Chloride: An Effective Catalyst for the One-Pot Synthesis of 2,4,5-Trisubstituted Imidazoles
... An efficient synthesis of 2,4,5-trisubstituted imidazoles is achieved by three component cyclocondensation of 1,2-dicarbonyl compound, aldehyde and ammonium acetate using Ammonium chloride (NH ... See full document
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Efficient and green synthesis of trisubstituted imidazoles by magnetically nanocatalyst and microwave assisted
... and efficient catalyst for the synthesis of 2,4,5-trisubstituted imidazoles via three-component reaction of aromatic aldehydes with benzil and ammonium acetate under low power microwave ... See full document
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Nano Silica Phosphoric Acid: An Efficient Catalyst for the One- Pot Synthesis of 1, 2, 4, 5-Tetrasubstituted Imidazoles
... the synthesis of these heterocycles has been usually carried out in polar solvents such as ethanol, methanol, acetic acid and DMSO leading to complex isolation and recovery ...containing catalyst and ... See full document
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Chitosan decorated copper nanoparticles as efficient catalyst for one-pot multicomponent green synthesis of novel quinoline derivatives
... bar. Catalyst morphology was investigated by means of field emission scanning electron microscopy (FEG-SEM, Quanta FEG450, FEI, the Netherlands) using an ETD Everhart Thornley detector (High Vacuum mode), a ... See full document
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4) Ascorbic acid: a naturally green and efficient catalyst for one-pot synthesis of N-aryl-3-aminodihydropyrrol-2-one-4-carboxylates under ambient temperature
... mmol) and formaldehyde 4 (1.5 mmol) and ascorbic acid (0.026 g) were added and the reaction was stirred for appropriate time. After completion of the reaction (by thin layer chromatography TLC), the mixture was ... See full document
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← Return to Article Details PHTHALIC ACID: A GREEN, BIODEGRADABLE AND ENVIRONMENTALLY BENIGN NATURE DIFUNCTIONAL BRØNSTED ACID CATALYST FOR THE ONE-POT SYNTHESIS OF 3, 4-DIHYDROPYRIMIDIN-2- (1H)-ONE DERIVATIVES AND SUBSTITUTED DIHYDRO-2-OXYPYRROLES
... a green, biodegradable economical and environmentally benign nature catalyst for the one-pot three-component Biginelli synthesis of 3,4-dihydropyrimidin-2-(1H)-one ... See full document
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One pot synthesis of Bis-coumarin derivatives by using mixture of dodecyl benzene sulfonic acid and sodium benzyl dodecyl sulphateas an efficient catalyst in water
... during synthesis of coumarin like use of organic solvents, laborious workup, increasing cost of reaction, long reaction time with low ...LiClO 4 , KHSO 4 , montmorillonite and ... See full document
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A Facile and Efficient One Pot Regioselective Synthesis of 2 Hydroxyalkyl Dithiocarbamates under Catalyst Free Conditions
... Dithiocarbamates are a class of fungicides extensively used worldwide on a range of crops mainly due to their efficiency in controlling plant fungal diseases and rela- tively low mammalian acute toxicity [9]. They have ... See full document
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P2O5/Al2O3 as an effieient catalyst for one-pot synthesis of polyhydroquinoline derivatives under solvent-free conditions
... A mixture of dimedone (1 mmol), benzaldehyde (1 mmol), ethylacetoacetate (1 mmol), ammonium acetate (1 mmol) and Phosphorus pentoxide supported on alumina (8 % mol) was stirred at 110 ° C for the appropriate time ... See full document
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An Efficient Synthesis of 3,4-Dihydropyrimidin-2-(1H)-one Derivatives Promoted by Antimony Trichloride under Thermal and Solvent-free Conditions
... The first synthesis of 3,4-dihydropyrimidin-2-(1H)-ones derivatives was reported by Biginelli [1] in 1893. 3,4-Dihydropyrimidin-2-(1H)-ones and their derivatives serve as a major category of ... See full document
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