[PDF] Top 20 Phosphomolybdic acid supported on silica gel as efficient and reusable catalyst for Amidation of esters
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Phosphomolybdic acid supported on silica gel as efficient and reusable catalyst for Amidation of esters
... In recent years, the use of microwave irradiation as a thermal source to accelerate organic reactions has gained popularity after Gedye’s pioneering report. Due to shorter reaction times cleaner reactions, easy work up ... See full document
5
Silica Boron Sulfonic Acid as Heterogeneous and Highly Efficient Solid Acid Catalyst For the Preparation of Hantzsch 1,4-dihydropyridines Under Solvent-Free
... heterogeneous reusable solid acid catalyst can act as a Lewis acid and Brønsted acid catalyst, which this behavior can be help to the better effect ...sulfonic acid (BSA) ... See full document
8
Silica gel Supported Boric tri-Sulfuric Anhydride (SiO2-BTSA): an Efficient Catalytic System for the Synthesis of Phloroglucide analogs as Antimicrobial Agents
... highly efficient catalysts in organic synthesis ...here, silica supported boric tri-sulfuric anhydride (SiO 2 -BTSA) as a novel, reusable and ... See full document
18
Sulfuric Acid Immobilized on Silica Gel as Highly Efficient and Heterogeneous Catalyst for the One Pot Synthesis of 2,4,5 Triaryl 1H imidazoles
... MCRs have great contribution in convergent synthesis of complex and important organic molecules from simple and readily available starting materials, and have emerged as powerful tools for drug discovery [3,4]. The ... See full document
7
Fe- Containing Ionic Liquid Supported on Nanosized MCM-41: An Efficient and Reusable Catalyst in the Synthesis of 2-Aryl Benzimidazole Derivatives
... All compounds were purchased from Aldrich and Merck companies and used as received without further purification. The purity of the products and reaction monitoring were followed by thin layer chromatography on Merck ... See full document
6
Silica Gel for Enhanced Activity and Hypochlorite Protection of Cyanuric Acid Hydrolase in Recombinant Escherichia coli
... hydroxyl-rich silica gel has a strong buffering capacity, and we cannot determine precisely how many free silica hydroxyl groups remain during the gelling ...the gel (see Fig. S3 in the ... See full document
11
Nano-Silica Phosphoric Acid: An Efficient Catalyst for One-Pot Synthesis of Tetrahydrobenzo[a]xanthenes-11-one Under Solvent- Free or Sonication Conditions
... the catalyst residue was washed with acetone and ...the catalyst surface more efficiently (table 1, entries 12 and ...The catalyst was reusable although a gradual decline was observed in its ... See full document
7
Silica sulfuric acid: Recyclable and efficient catalyst for the 2-aryl benzothiazoles
... conclusion, silica sulfuric acid was found to be a mild, efficient and reusable solid acid catalyst for the synthesis of 2-arylbenzothiazoles in almost quantitative ... See full document
5
Silica Supported Zinc (Ii) Chloride (Sio2-Zncl2) As An Efficient Catalyst For The Eco-Friendly Synthesis Of 2,3-Dihydroquinazolin-4(1h)-Ones
... Silica supported zinc (II) chloride (SiO 2 -ZnCl 2 ) as an efficient and non-toxic heterogeneous catalyst have been used for the simple and facile synthesis of 2,3-dihydroquinazolin-4(1H)-ones ... See full document
6
Silica-Supported Silver Nitrate as a Highly Active Dearomatizing Spirocyclization Catalyst : Synergistic Alkyne Activation by Silver Nanoparticles and Silica
... proceeded very efficiently, converting a total of 23.6 g of ynone 1a into spirocycle 2a in quantitative yield over a 51 h period (Scheme 3). This corresponds to a total catalyst loading of 0.12 mol% and an NMR ... See full document
5
Sulfonic acid supported on Fe2O3/VO2 nanocatalyst: A highly efficient and reusable nanocatalyst for synthesis of spirooxindole derivatives
... Nanocatalysis has become an important field in organic chemistry due to its high activity, selectivity, and efficient supports for the immobilization of homogeneous catalysts [1]. The nanoscale size, shape and ... See full document
11
Amidation of esters with amino alcohols using organobase catalysis
... A catalytic protocol for the base-mediated amidation of unactivated esters with amino alcohol derivatives is reported. Investigations into mechanistic aspects of the process indicate the reaction involves ... See full document
23
PWA Doped SiO2 PEG Hybrid Materials of Class II
... It is interesting to investigate the thermal stability of these class II systems in comparison to those ones of the corresponding class I. In order to do this, we have com- pared the sample B0 with a hybrid, called B0I, ... See full document
7
Catalyst system comprising a first catalyst system tethered to a supported catalyst
... new catalyst formats which comprise a supportedcatalyst tethered to a second and different catalyst by a suitable tethering ...heterogeneous supported metal catalyst tethered to a homogeneous ... See full document
20
Method of Converting Free Fatty Acids to Fatty Acid Methyl Esters
... in acid oil or acid fat into fatty acid methyl esters is ...an acid catalyst to the acid oil or acid fat and subjecting the mixture to conditions that allow the ... See full document
15
The use of Silica Supported Nickel-Copper Oxide Catalyst for Photodegradation of Methylene Blue
... Photodegradation is a safe and low cost methods to clean water bodies from some organic pollutants. The method has been developed in term of increasing the efficiency of the degradation capacity of photocatalyst. The ... See full document
6
Sulfated Titania Nanoparticles: an Efficient Catalyst for the Synthesis of Polyhydroquinoline Derivatives through Hantzsch Multicomponent Reaction
... as catalyst showed high efficiency for the synthesis of PHQ derivatives using various aldehydes, dimedone or 1,3-cyclohexanedione, methyl or ethyl acetoacetate, ammonium acetate in EtOH under reflux ...the ... See full document
9
Silica Sulfuric Acid as a Efficient and Recyclable Solid Acid Catalyst for the One-Pot Synthesis of 2,4,6-Triaylpyridines Under Solvent Free Conditions
... the catalyst is one of the most important benefits, thus the recovery and reusability of H 2 SO 4 -SiO 2 was ...The catalyst was filtrated and recycled catalyst washed with ethanol, dried and reused ... See full document
5
Solvent Free Synthesis of α, á Bis(substituted benzylidene)cycloalkanones Using Covalently Anchored Sulfonic Acid on Silica Gel (SiO2 R SO3H) as an Efficient and Reusable Heterogeneous Catalyst
... of catalyst, no toxicity, no corro- siveness, short reaction times, inexpensive solid catalyst, high yields, mild reaction conditions and clean work up steps are significant merits of this ... See full document
5
STEREOSELECTIVE TOTAL SYNTHESES OF MACROCYCLIC DEPSIPEPTIDE CRYPTOPHYCIN−24, (−)−GALANTINIC ACID AND DEVELOPMENT OF HETEROGENEOUS CATALYSED SYNTHETIC METHODOLOGIES
... Development of new synthetic methodologies is an important subject in organic chemistry. Synthesis involves expensive reagents and catalysts, which are not easily available. To replace all such reagents and catalysts, ... See full document
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