Brønsted acid
Low Environmental Load Process for the Beckmann Rearrangement of Cycloalkanone Oximes by Brønsted Acid Catalyst with Cobalt Salts
... of acid catalyst. To reduce the amount of Brønsted acid required, and to avoid the formation of a large amount of undesirable byproducts under mild reaction conditions, a low en- vironmental load ...
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Structure activity correlations for Brønsted acid, Lewis Acid, and photocatalyzed reactions of exfoliated crystalline niobium oxides
... defects, acid- ities and band structures of these thin layered structures have been extensively characterized with XRD, multi-nuclear solid state NMR, EPR, XPS, CV, UV-vis, TRPL, ...(Brønsted acid ...
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The Development of Brønsted Acid Catalysis Technologies and Mechanistic Investigations Therein
... Another area of organocatalysis that has recently garnered attention is that of hydrogen bonding and Brønsted acid catalysis. 5 Similar to iminium catalysis, in this activation mode imine and carbonyl ...
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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
... Phthalic acid is a biodegradable green [28-29] and environmentally benign nature di-functional chemical compound that the bacteria Pseudomonas ...phthalic acid as a biodegradable green and efficient ...
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Chiral Brønsted acid catalyzed enantioselective dehydrative Nazarov type electrocyclization of aryl and 2 Thienyl vinyl alcohols
... chiral Brønsted acid anion now occupying one face of the substrate cation as a result, this might then allow asymmetric induction in the ensuing pericyclic reaction step to be accom- plished to give the ...
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Imidazole Functionalized Magnetic Fe3O4 Nanoparticles a Highly Efficient and Reusable Brønsted Acid Catalyst for the Regioselective Thiocyanation of Aromatic and Heteroaromatic Compounds at Room Temperature in Water:Ethanol
... The Magnetically recoverable Fe3O4 nanoparticle and the supported brønsted acidic ionic liquid 1-methyl-3-(3-trimethoxysilylpropyl) imidazolium hydrogen sulfate (Fe 3 O 4 - IL-HSO 4 ) w[r] ...
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Bifunctional oxidative and acidic titanium silicalite (TS-1) catalysts for one pot synthesis of 1,2-octanediol from 1-octene
... (SZ/TS-1), and niobium oxide supported on TS-1 (Nb/TS-1). The X-ray diffraction analysis revealed that TS-1 still retained the MFI structure after incorporation of the acidic oxides even when the crystallinity is lower. ...
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Mechanistic studies of the hydrogenation of imino bonds
... We have developed a new metal-organo cooperative catalytic system, in which a chiral Brønsted acid induces chirality in an achiral metal-catalysed hydrogenation. The catalyst is highly efficient, affording ...
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Organic Structure Directing Agent Free Synthesis of Small Pore Zeolite Catalysts for the Methanol to Olefins Reaction
... that Brønsted acid sites are located both in the intact 8MR cages as well as in the mesopores and external surface of the steamed ...the acid sites in the ...access acid sites in the mesopores ...
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Recyclable Boron Sulfonic Acid as an Environmentally Benign Catalyst for the One-Pot Synthesis of Coumarin Derivatives under Solvent-Free Condition
... times.All the reactions were completed within 10-60 minutes with high yields (75–98 %). The SBSA mayplays a dual role as a Brønsted acid and as a Lewis acid catalyst, and can be simply removed from ...
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Silica Boron Sulfonic Acid as Heterogeneous and Highly Efficient Solid Acid Catalyst For the Preparation of Hantzsch 1,4-dihydropyridines Under Solvent-Free
... and Brønsted acid catalyst was successfully synthesized, and used for the one-pot three- components synthesis of biologically active substituted Hantzsch 1,4-dihydropyridine derivatives in the absence of ...
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Keggin Structure and Surface Acidity of 12 Phosphotungstic Acid Grafted Zr MCM 48 Mesoporous Molecular Sieves
... 174 mol/g Brønsted acid sites which were 21.7 times greater than that of Zr-MCM-48. The Keggin structure of the grafted heteropolyacid was rather stable after calcination at 400˚C for 2 h, approximately ...
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Manuscript Title & Authors
... Lewis acid (LAS) and BrØnsted acid sites (BAS) and BAS show much higher acid strength than ...on acid sites have been well documented in ...
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Phycochemical Property of Pithophora Oedogonia (Mont). Wittrock With Special Reference to its Neutraceutical Significance
... The crude fiber content was estimated following the procedure of AOAC 1999. The ash content was analysed following woodman 1945, Moisture and food energy (Gopalan 1989) and the total lipid content ( Bligh and Dyer ...
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High quality draft genomic sequence of Flavihumibacter solisilvae 3-3T
... The presence of 4-hydroxyphenylpyruvate dioxygenase (KIC95062), homogentisate 1,2-dioxygenase (KIC93392) and other related enzymes suggests that 4-hydroxypheny- lacetic acid is degradable via homogentisic ...
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Pyrazolidinones as templates in asymmetric catalysis
... Asymmetric reaction with catalyst (5R)-163 was optimised and the catalyst was subsequently screened against a range of ! , " -unsaturated aldehydes. Good ee’s were obtained for a variety of aromatic aldehydes but ...
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“A Comprehensive Review on Biological Activities of P-Hydroxy Benzoic Acid and Its Derivatives” by Rohini Manuja, Shikha Sachdeva, Akash Jain, Jasmine Chaudhary, India.
... benzoic acid is an organic chemical that is reported to exhibit antimicrobial activity against a number of micro-organisms viz Gram positive as well as Gram negative bacteria like Escherichia coli, Bacillus ...
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PHYTOCHEMICAL PROFILE OF SEQUOIA SEMPERVIRENS GROWN IN EGYPT
... Qualitative and Quantitative HPLC Analysis of Phenolic Acids: HPLC analysis of the EAFL of S. sempervirens (D. Don.) was performed using a Knauer HPLC system (Germany) with a model 64- 00 pump, model 87-00 UV detector ...
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Method of Making Fatty Acid N Acylalkanolamines
... radecenoic acid, pentadecanoic acid, palmitic acid, palmi toleic acid, cis-9-hexadecenoic acid, heptadecanoic acid, heptadecenoic acid, stearic acid, oleic acid, linoleic acid, linolenic[r] ...
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CHANGES IN THE BILE-ACIDS COMPOSITION OF BILE JUICE AFTER FAT INTAKE
... (gastric acid and bile) is more harmful than acid gastric reflux alone with possible toxic synergism between the taurine conjugates and acid, and that the pH range 4–7 wherein most bile acids exist ...
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