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Showing 1 to 20 of 617 for “"substituents"”.
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Nucleophilic Displacement of Substituents in Hindered Aromatic Ketones
Made available in DSpace on 2014-12-05T19:35:55Z (GMT). No. of bitstreams: 1 0009069.pdf: 5230208 bytes, checksum: 9198e67bc0684b5dc24377aa7590c318 (MD5) Previous issue date: 1954
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Synthetic studies of sodium aminodiboranate salts with electronwithdrawing substituents
… inductive, and hyperconjugative effects of the substituents on nitrogen are all in competition in these systems. In chapter 2 we describe the preparation of fluorinated aminodiborantes, although here the longer reaction times required for their synthesis lead to undesirable production of …
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Synthesis and Characterisation of Phosphenium Ions with Aromatic Amido Substituents
… stable phosphenium ions such as F, with amido substituents. This approach is also followed in this work. In particular, the synthesis, characterisation, and properties of a range of phosphenium ions (4) with alkyl or aryl amido substituents (R2N, R = alkyl or aryl) is described. The desired …
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Synthesis and Characterization of Cyclopentadienyl Transition Metal Complexes Bearing Tetrafluoropyridyl Substituents
Three new tetrafluoropyridyl-substituted cyclopentadienes were synthesized. Reactions of pentafluoropyridine (C5F5N) with sodium cyclopentadienide (NaCp) in THF with excess NaH present afforded mixtures of (4-tetrafluoropyridyl)cyclopentadiene (1), 1,3-bis(tetrafluoropyridylcyclopentadiene) (2), …
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Tuning of the fluorescence properties of nitrogen heterocyclic compounds by polar substituents /
… properties by modifying new compounds with substituents of various polarity and morphology are analyzed. Special emphasis is placed on the radiative and non-radiative excitation relaxation mechanisms. This work demonstrates that the nitrogen heterocyclic fragments in conjunction with polar …
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Estrogens Containing Alkylating Substituents: The Synthesis and Estrogen Receptor Interactions of Estradiol and Hexestrol Affinity Labels
A series of chemically-reactive derivatives of estradiol and the non-steroidal estrogen hexestrol have been synthesized as potential affinity labels for the uterine estrogen receptor, or as cytotoxic agents with selective activity against receptor-containing cells. These compounds are hexestrol …
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The Effect of Substituents on The 4-Position on The Stability of 1-Amino-2-Methylnaphthalene Derivatives
Made available in DSpace on 2014-12-05T19:36:25Z (GMT). No. of bitstreams: 1 0018138.pdf: 6161114 bytes, checksum: 5ca9373a5a3273b8b3a7c8501c7a6bdd (MD5) Previous issue date: 1956
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Synthesis, pharmacological and solubility evaluation of antiplasmodial pyrido[1,2-a]benzimidazoles with cyclic and functionalized amine side chain substituents
… cyclic and functionalized amine side chain substituents bearing polar, hydrogen-bonding groups were synthesized and evaluated for pharmacological and beta-hematin inhibition activity. The functionalized and cyclic amine side chain substituents were envisaged to improve aqueous solubility of …
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Unusual Electron Transfer Rate Effects due to Pyridyl Ring Substituents and Trace Group VIII b Hexacyano Complexes as Added Salts
<p>The rates of pseudo-self-exchange electron transfer reactions between [(NH<sub>3</sub>)<sub>5</sub>Ru<sup>II</sup>L]<sup>2+</sup> and [(NH<sub>3</sub>)<sub>5</sub>Ru<sup>III</sup>L’]<sup>3+ </sup> at reactant concentrations of 1.0 х 10<sup>-4</sup> M (where L, L’ = substituted pyridines) and the …
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The F(430) cofactor of methyl coenzyme M reductase: Ligand binding to the nickel and chemical modification of the tetrapyrrole substituents
Chemical and spectroscopic studies on the nickel enzyme methyl-CoM reductase from M. thermoautotrophicum (strain $\Delta$H) were undertaken to better characterize the nickel site. The major goals of this work are two-fold: (1) To further characterize the molecular and electronic structure of the …
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A study of the electronic effects of various substituents on the course of an aromatic cyclodehydration reaction vs. a Elbs-type reaction
… conditions of an .Elba reaction. The effect of substituents on the course of this reaction was investigated by synthesizing six 2-benzylphenyl 1- and 2-naphthyl ketones and subjecting each of them to the acid catalyzed reaction and to Elba reaction conditions. Of the six ketones, two had …
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Novel synthetic methodology employing transition metal catalysed reactions of α-diazo-β-keto sulfonamides and α-cyano-α-diazoacetates; the impact of substituents on the reaction pathway
… aromatic addition. The precise impact of the substituents of an α-diazocarbonyl compound, on the ensuing rhodium- and copper-catalysed reaction pathway(s), is also examined in this work through comparison to analogous transformations reported previously in the group and in the literature. …
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Electrochemistry, Acid-base Properties and Spectroelectrochemistry of Porphyrins, Corroles, and Related Molecules
… to four types of free-base porphyrins (with meso-substituents, with β-substituents, with negatively charged substituents and with positively charged substituents). Both neutral and protonated porphyrins involve multiple redox reactions depending upon the selected solvent, supporting electrolyte …
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