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Showing 1 to 20 of 41 for “"Ammonium salts."”.
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Development of novel methodologies utilizing quaternary ammonium salts as catalysts
The first half of this thesis (Chapter 2) described the development of a fluoride-promoted conjugate addition of sulfur-stabilized carbanion nucleophiles to α,β-unsaturated ketones and esters. This reaction was achieved using a substoichiometric amount of TBAF, resulting in high yields on the …
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Steric Effects of Alkyl Ammonium Salts on the Combustion of Exchanged Smectite Clays
… Smectite clays were modified with several alkyl ammonium salts varying in number of carbons and the spatial orientation of the carbons about the central nitrogen atom. The clays used, standards purchased from the Source Clay Repository, have CECs of 44, 80, 88, and 120 meq/100 g. Theoretically, …
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Part I. The Nuclear Magnetic Resonance of Quaternary Ammonium Salts. Partii. Leaving Group Effects in Some Solvolysis Reactions
Made available in DSpace on 2014-12-09T17:35:16Z (GMT). No. of bitstreams: 1 6511748.pdf: 5533111 bytes, checksum: 9ad51f0e52eefb329f0368ac49c0d690 (MD5) Previous issue date: 1965
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Expression of sigma receptors in human cancer cell lines and effects of novel sigma-2 ligands on their proliferation
… novel sigma-2 ligands. These ligands are simple ammonium salts containing a single nitrogen atom. They are simpler than the previously recognised pharmacophore for the sigma-2 site. I have shown that these simple ammonium salts show graded affinity for the sigma-2 binding site. The highest …
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Utilization of Rationally Designed Small Molecule Chiral Selectors in Novel Enantioselective Processes
… adducts which are stabilized by quaternary ammonium salts in a nonpolar medium. When run in the presence of a chiral selector, one enantiomer is effectively shielded from reaction. The methodology is extended to enantioselective nucleophilic aromatic substitution, reactions known to proceed …
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A carbon-13 nuclear magnetic resonance study of a series of cyclohexanol amines
… alcohols, amines, and ammonium salts was undertaken and the resultant correlations were extended to a series of eight b-butylcyclohexanol amines and their hydrochloride salts. Among the effects examined were the substituent parameters of the mono- and difunctionalized …
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Synthesis of Crown Ether/Ammonium Salt for Electron Transfer Study
… in this study are a series of crown ether/ammonium salt, which incorporate a redox partner on each component of the complex. The dimethoxynaphthalene redox donor was attached to the crown ether and a series of ammonium salts was synthesized which bear substituted quinone and naphthoquinone …
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Amine promotion of hydrogen evolution reaction suppression and CO2 conversion for artificial photosynthesis
… CO2 reduction in choline based quaternary ammonium salts, the overpotential decreases and the starting potential of hydrogen evolution increases. This can be contributed to the fact that amine from choline based electrolyte initiates the suppression of the hydrogen evolution reaction and …
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Self-Assembly: Synthesis and Complexation of Crown Ethers and Cryptands with R2-NH2 Ions
… crown ethers (> 22 atoms) with secondary ammonium salts. Also of great interest was to understand the complexation behavior of the crown ethers with the salts, with emphasis on determining the stoichiometries and association constants of the complexations in solution using NMR …
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Birch reduction of benzenesulfonamide and benzenephosphonic acid
… with proton donors such as alcohols, water, or ammonium salts. Figure 2 [see PDF] </p>
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I SYNTHESES OF SELECTIVELY FUNCTIONALIZED 9(ANE)NITROGEN(3) AND 12(ANE)NITROGEN(3) CYCLIC TRIAMINES II SYNTHESES, COMPLEXATION, AND CONFORMATIONAL STUDIES OF SOME AZAPODANDOCORONANDS (TRANSANNULAR, TRICYCLICORTHOAMIDE, AMIDINIUM SALTS)
<p>A series of bicyclic amidinium salts and tricyclic ammonium salts have been prepared from corresponding tricyclic orthoamides. The spectroscopic data pertaining to these compounds (IR, ('1)H NMR, ('13)C NMR, ('15)N NMR, DNMR) are discussed in terms of relevant stereoelectronic effects and …
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Investigations in the chemistry of transition metal complexes containing the tripodal amine β,β′,β″-triaminotriethylamine
… many industrial processes. More specifically, ammonium salts of hexachloro and hexabromo complexes of rhodium(IlI) and iridium(III) are used as sensitizers in photographic processes.</p> <p>Finally, a chloro-ammine complex of platinum(II) has been cited as one of the most promising antitumor …
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Direct oxidative Ammonia-Ammonium salt leaching of sphalerite concentrate from the Gamsberg Mine and study of the catalytic effect of Cu(II) on Zinc extraction
The feasibility of using ammonia-ammonium salts to selectively leach Zn over Fe from Gamsberg sphalerite flotation concentrate under moderate temperatures and atmospheric pressure was investigated in stirred tank reactors. This approach is suggested as an alternative primary method for extracting …
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Designing new chiral hydroxamic acid ligands for the asymmetric epoxidation reaction in water
… In this project, a range of chiral quarternary ammonium salts have been prepared as precursors to the corresponding dihydropyridines. It was our initial intention to utilise these chiral dihydropyridines in the enantioselective reduction of imines. This would result in the formation of the …
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Assimilation of N¹⁵-histidine in amino acid imbalance
… a defined medium containing nitrogen-15 enriched ammonium salts as the only source of nitrogen. Commercially prepared L-N¹⁵-histidine.HC1.H₂0 was used to follow the limiting amino acid in the imbalanced diet in rats fed a chemically-defined imbalanced or corrected diet. Total nitrogen content and …
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