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Articles 33061 - 33090 of 34528
Full-Text Articles in Physical Sciences and Mathematics
Liquid Scintillators. The Photooxidation Of 2,5-Diphenyloxazole, Margaret E. Ackerman
Liquid Scintillators. The Photooxidation Of 2,5-Diphenyloxazole, Margaret E. Ackerman
Chemistry and Chemical Biology ETDs
Mackay had found that prolonged ultraviolet irradiation of solutions of 2,5-diphenyloxazole (PPO) (1) in toluene resulted in the formation of an insoluble crystalline product 2 which accumulated above the meniscus; the formation of 2 was dependent upon the presence of dissolved oxygen and water in the solutions. The Compound 2 was not a simple degradation product of PPO (1); elemental analysis was compatible with the empirical formula C22H17O5N and the thermal decomposition of 2 gave equal molar amounts of carbon monoxide, benzoic acid, and dibenzamide. The study described in this dissertation was initiated to establish the structure of 2 and …
12th Annual Rocky Mountain Spectroscopy Conference
12th Annual Rocky Mountain Spectroscopy Conference
Rocky Mountain Conference on Magnetic Resonance
Program and abstracts from the 12th annual meeting of the Rocky Mountain Spectroscopy Conference, sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy. Held in Denver, Colorado, August 3-4, 1970.
The Synthesis And Photolysis Of Kreysiginone And The Syntheses And Antibacterial Activity Of 1-Vinyl-3,4-Dihydroisoquinoline Methiodides, Bruce L. Jensen
The Synthesis And Photolysis Of Kreysiginone And The Syntheses And Antibacterial Activity Of 1-Vinyl-3,4-Dihydroisoquinoline Methiodides, Bruce L. Jensen
Dissertations
No abstract provided.
Part I. The Stereochemistry Of Carbanions Formed By Base Catalyzed Decomposition Of Azoacetates Part Ii. Anomalous Decarbonylation Of 4 –Substituted Carboxylic Acids With Thionyl Chloride, Tai-Shun Lin
Dissertations
Introduction
Although the stereochemical capabilities of carbonium ions have been extensively investigated, the stereochemical fate of carbanions has been subjected relatively little to systematic scrutiny. The fact that only a limited number of clean-cut sources of carbanions are available has added difficulty to such investigations.
The stereochemical capabilities of carbanions has been extensively and thoroughly examined in recent years by Cram and coworkers. However, the carbanion carbon developed in the reactions employed was bonded in every case to an unsaturated (usually aromatic) group. No fully aliphatic carbanion has been subjected to such a stereochemical study.
The reaction of lead tetraacetate …
The Design, Construction, And Application Of A Multibeam Fiber Optics Photometric Titrator, Marlin George Bensinger
The Design, Construction, And Application Of A Multibeam Fiber Optics Photometric Titrator, Marlin George Bensinger
Masters Theses
No abstract provided.
The Chemistry Of Dehydronaphthalene, Richard Harold Hales
The Chemistry Of Dehydronaphthalene, Richard Harold Hales
Theses and Dissertations
The reaction of monohalonaphthalenes with potassium t-butoxide in a t-butyl alcohol-dimethyl sulfoxide (DMSO) mixture has been studied. The 1-bromonaphthalene reaction was extensively studied. Fifteen identifiable products were observed and conditions were found where the desired products, 1- and 2-t-butyl naphthyl ethers (V and VI) were formed in maximum yield, and their decomposition products, 1- and 2-naphthol (XIV and XV), were formed in minimum yield. The mole percent ratio of 1-substituted products (V and XIV) to 2-substituted products (VI and XV) was found under standardized conditions to be 0.35 ± 0.03 in every case when the halogen was I, Br and …
The Effects Of Various Treatments On Thiamin Diphosphate And Total Thiamin Levels Of Rat Tissues, Dong Hwa Park
The Effects Of Various Treatments On Thiamin Diphosphate And Total Thiamin Levels Of Rat Tissues, Dong Hwa Park
Theses and Dissertations
Tissue thiamin diphosphate was assayed enzymatically utilizing purified brewer's yeast apotransketolase. With this assay ten uumoles of thiamin diphosphate could be detected. Total thiamin was fluorometrically measured. For one to three days rats were placed under conditions of stress, consisting of loud noise treatment, emotional stress, deprivation of paradoxical sleep, and swimming to exhaustion, respectively. The body weight was markedly decreased at the end of the respective experimental periods except with the loud noise treated group, compared with the corresponding controls. Following two to three such consecutive treatments, the adrenal weight also showed a significant increase. Thiamin diphosphate and total …
The Reaction Of Acetaldehyde With Some Cobalt (Iii) Complexes Containing Coordinated Glycine, James C. Dabrowiak
The Reaction Of Acetaldehyde With Some Cobalt (Iii) Complexes Containing Coordinated Glycine, James C. Dabrowiak
Dissertations
No abstract provided.
Effects Of Hydrocarbon Chain Length On The Thermodynamics Of Formation Of Bis(N-Alkylamino)-Silver (I) Complex Ions, Don J. Temer
Effects Of Hydrocarbon Chain Length On The Thermodynamics Of Formation Of Bis(N-Alkylamino)-Silver (I) Complex Ions, Don J. Temer
Chemistry and Chemical Biology ETDs
As part of a comprehensive study of the thermodynamics of conformational changes of n-alkyl groups in aqueous solution, the equilibrium constants, enthalpy changes, and entropy changes have been measured for the stepwise formation of bis(n-alkylamino)silver(I) complex ions at 25° in dilute aqueous solution. The attachment of the charged Ag+ to the end of the amine molecule is thought to cause changes in the conformation of the n-alkyl chain. The effects of these conformational changes on the formation constants, enthalpy changes, and entropy changes of the Ag+ complexes are discussed and compared with the effects on the formation constants, …
Hellmann-Feynman Theorem In Thomas-Fermi And Related Theories, Jerry Goodisman
Hellmann-Feynman Theorem In Thomas-Fermi And Related Theories, Jerry Goodisman
Chemistry - All Scholarship
The general Hellmann-Feynman theorem (derivative of energy with respect to a parameter = expectation value of derivative of Hamiltonian) is proved for theories in which the electron density is determined by making the energy functional stationary. Some simple applications are given.
A Spectroscopic Investigation Of Electron Transfer Transitions In Osmium (Ii) Complexes., Brian J. Pankuch
A Spectroscopic Investigation Of Electron Transfer Transitions In Osmium (Ii) Complexes., Brian J. Pankuch
Chemistry and Chemical Biology ETDs
Osmium (II) complexes containing organic coordinating ligands 2.2'-bipyridine, 1.10-phenanthroline, 2.2' .2"terpyridine were studied spectroscopically. Syntheses were carried out by published methods, and each complex was checked by chemical analysis and thin layer chromatography. The complexes were shown to be d6 strong field systems by magnetic susceptibility measurements performed at room temperature in air.
Room temperature absorption spectra in the visible and near-ultraviolet were measured in solvents of different polarities (H2O, MeOH, CH3CN, DMF, CHCl3) and solvent shifts of the band maxima of 0.3 to 3 kK were found. Low temperature (approximately 82-90°K) absorption spectra …
Quantitative Spark-Source Mass Spectrometric Techniques For The Simultaneous Determination Of The Lanthanide And Actinide Elements In Microgram And Sub-Microgram Transuranium Samples, Joel Avery Carter
Doctoral Dissertations
The work presented encompasses techniques developed for the analysis of certain rare earth and actinide elements in solutions containing highly radioactive transuranium elements. Advantage was taken of the high inherent resolution and sensitivity of the rf spark-source mass spectrometer in the development of qualitative and quantitative procedures where an analysis can be made on a total sample of <1 to 10 μg. Parameters for the Associated Electrical Industries' MS-702 spark-source mass spectrometer were adjusted so that mass-to-charge ratios in the range of 10 to 310 could be subjected to qualitative analysis. For quantitative assessment of impurities in a transuranium solution, relative sensitivity factors were established with respect to erbium, the internal standard, for rare earth elements and for thorium, uranium, neptunium, americium, curium, berkelium, and californium.
A special glove box was designed, fabricated, and used on the source end of the mass spectrometer so that samples of the transuranium elements could be run safely. Transuranium element with α-emitting radioactivity up to 1010 dpm were processed through the …
1>Analytic Approach To Electron Correlation In Atoms, Ronald White, Frank Stillinger
Analytic Approach To Electron Correlation In Atoms, Ronald White, Frank Stillinger
Center for Advanced Mineral and Metallurgical Processing (CAMP)
A novel perturbative treatment of electron correlation in N‐electron atoms is devised. The unperturbed starting point is a central‐force “hydrogenic” problem in the full dN‐dimensional configuration space (d = dimensionality). The central potential in this solvable “hydrogenic” problem is obtained by averaging the actual electron–electron and electron–nucleus potentials over all dN − 1dN − 1 hyperspherical polar angles in the configuration space. The relevant projected Green's functions are computed for the ground states of the model one‐dimensional two‐electron atom (with delta function interactions), as well as for the real three‐dimensional helium isoelectronic sequence. The corresponding first‐order wavefunctions exhibit weakly singular …
Halogenated Helicenes, Richard Wilbert Heiden
Halogenated Helicenes, Richard Wilbert Heiden
Honors Theses
Attempts at synthesizing certain halohelicenes for studies in the following areas are described: 1) the testing of a new method of resolving 2) electron spin resonance (ESR). Since the purpose of the study was twofold, the decision to synthesize monochloro derivatives of hexahelicene was based on the time element and the comparative ease in which these particular compounds were thought to have been brought about (i.e. in direct comparison to polyhalo and higher order helicenes). In addition to the traditional historical, theoretical, and experimental sections, an appendix contained a few suggestions relative to helicene research is included.
Calculations Of Total Energies For Neon Atom, Argon Atom And Neon Ion, Joseph Patrick Minehan
Calculations Of Total Energies For Neon Atom, Argon Atom And Neon Ion, Joseph Patrick Minehan
Honors Theses
This work shows that is is very difficult to guess the proper configuration of the spheres for most atoms. This is clearly shown in the argon calculations, where Bent suggested a configuration that would have lowest energy, but it turned out to have the highest energy of those calculated. This shows the need to have a method to give the configuration of the lowest energy that depends very little on human insight.
Synthetic Approaches To Tris (1-B, 8-B'-Naphthyl) Diboron, William Karl Goerich
Synthetic Approaches To Tris (1-B, 8-B'-Naphthyl) Diboron, William Karl Goerich
Honors Theses
The purpose of this project was the synthesis of tris(l-B, 8-B'naphthyl)diboron. The synthesis route attempted was the preparation of 1,8-dibromonaphthalene from 1,8-diaminonaphthalene by tetrazotization followed by a Sandmeyer reaction, treatment of the dibromo compound with n-butyllithium to give 1,8-dilithionaphthalene and subsequent addition of boron trifluoride to give the product.
Synthesis Of N-Methyl-N-Phenylaminomethyltrimethylsilane And N, N-Dimethylanilinomethyltrimethylsilyl Iodide, Mark Stuart Lichtenstein
Synthesis Of N-Methyl-N-Phenylaminomethyltrimethylsilane And N, N-Dimethylanilinomethyltrimethylsilyl Iodide, Mark Stuart Lichtenstein
Honors Theses
N-Methyl-N-Phenylaminomethyltrimethylsilane (I) has been prepared by heating an ethereal solution of lithium N-Methyl-anilide and chloromethyltrimethylsilane in a sealed flask for two days at 110°. The peak ratios in the NMR spectrum of the product did not correspond to these expected for I but suggested a different product, N-Methyl-N-Trimethylsilylaniline (II). Elemental analysis favored II although it could also be interpreted to support I. The spectra of derivatives, and the substance’s stability to hydrochloric acid were characteristic of I. Tentative identification of ethylene as a by-product, and a small degree of reaction with hydrochloric acid support the presence of II, but only …
High Pressure Spectral Chemistry Of Selected Organic Compounds, Frank William Linsley
High Pressure Spectral Chemistry Of Selected Organic Compounds, Frank William Linsley
Theses and Dissertations
The series of compounds indicated by the formular C_6H_5-(CH=CH)n-C_6H_5 change in color from white (colorless) to yellow to orange to red to deep red as n increases from 1 to 12. Stilbene is the first compound of this series (n=1). Under pressure, exerted by a diamond anvil press, stilbene can be seen to change color from white to yellow to red as increasing pressure is applied. Similar color changes are observed for the compounds where n=2,3, and 4 when subjected to similar pressure. This study records and reports the spectra versus pressure for these compounds.
Stability Of 1-Substituted Adenines, Walter Frederick Floser
Stability Of 1-Substituted Adenines, Walter Frederick Floser
Honors Theses
1-β-Hydroxyethyladenine was prepared by the reaction of ethylene chlorohydrin with adenine at 76° C. It was separated from the reaction mixture by use of a Dowex 50W-X8 cation exchange chromatography column and a linear gradient elution system. I was placed in aqueous alkaline solution for two weeks and checked at different intervals to determine its stability. I was also refluxed in an aqueous alkaline solution for 70 min. and its stability was checked. I proved to be stable under all conditions.
Photochemical Reduction Of Benzophenone By 2-Butyne-L, 4-Diol And Photochemical Solvolysis Reactions Of Beta-Phenethyl Compounds, Kenneth Lawrence Gordon
Photochemical Reduction Of Benzophenone By 2-Butyne-L, 4-Diol And Photochemical Solvolysis Reactions Of Beta-Phenethyl Compounds, Kenneth Lawrence Gordon
Honors Theses
The irradiation of a dioxane solution of benzophenone in the presence of 2-butyne-1, 4-diol leads to reduction of the ketone rather than addition across the triple bond of the alkyne. However, great difficulty was encountered in identifying the product due to the formation of an organic complex involving benzopinacol and the dioxane. Nuclear magnetic resonance and ultraviolet spectral data confirm the presence of the complex. An attempt was made to induce a known ground state reaction by photochemical means. This ground state reaction is known to proceed through an ethylene phenonium ion intermediate. Both β-phenethyl bromide and β-phenethyltrimethylammonium tetrafluoroborate were …
Determination Of Ring Orientation In Diphenylmethane And Derivatives, Patrick Michael Comi
Determination Of Ring Orientation In Diphenylmethane And Derivatives, Patrick Michael Comi
Honors Theses
Nuclear Magnetic Resonance Spectrometry, like infrared, visible, and ultraviolet spectrometry is a form of absorption spectrometry. Certain nuclei can absorb electromagnetic radiation in the radiofrequency range. These nuclei are able to absorb this energy because they “spin” about their center axis generating a dipole along it. Protons are among those nuclei that absorb radiofrequency energies. If a proton is placed in a magnetic field its dipole can be in one of two possible orientations. It can be in a low energy state aligned with the field, or a high energy state, a spinning proton will process about an axis at …
Preparation Of New Amino-, Thio-, And Sulfonyladamantane Derivatives, Joseph Craig Argyle
Preparation Of New Amino-, Thio-, And Sulfonyladamantane Derivatives, Joseph Craig Argyle
Theses and Dissertations
Various synthetic schemes were used to prepare a number of new amino-thio- and sulfonyladamantane compounds. By a nucleophilic substitution on 1-bromoadamantane, 1-(p-nitrophenylthio)adamantane was prepared from p-nitrothiophenol; the amino- and sulfonyl- derivatives of this compound were also prepared. Silver tosylate was used to generate the 1-adamantyl carbonium ion from 1-bromoadamantane in a synthetically useful procedure for preparing 1-adamantylamides from nitriles. Three 1-(1-adamantylcarbinyl)-2,5-dialkylpyrroles were prepared by Knorr-Paal reactions and reduced to the corresponding pyrrolidines. Thio- and aminomethyl 1-adamantyl ketones were prepared from methyl and bromomethyl 1-adamantyl ketones, respectively. Aliphatic and aromatic oxiranes were reacted with 1-aminoadamantane in a bomb at elevated temperatures …
The Reactivity And Selectivity Of The Reaction Of Sulfur Trioxide And Bromobenzene, Sullivan E. Blau
The Reactivity And Selectivity Of The Reaction Of Sulfur Trioxide And Bromobenzene, Sullivan E. Blau
Theses and Dissertations
The sulfonation of bromobenzene with sulfur trioxide in liquid sulfur dioxide at -12 to -13° C. was studied to determine its relative reactivity. The relative rate constant ratio, kbenzene/kbromobenzene, was found to be 28.6 in a competitive reaction between benzene and bromobenzene. The isomer distribution was found to be 0.15 ± 0.02% for the meta, 0.91 ± 0.04% for the ortho and 98.93 ± 0.14% for the para isomers. The partial rate factors were calculated to be pf= 0.208, of= 0.0096 and mf = 0.00018. The relative rate data exhibited a distinctive behaviour previously noted in related systems, possibly due …
The Synthesis And Properties Of New Potentially Chemotheraputic [Sic] Pteridine Derivatives, Walter Wesley Parish
The Synthesis And Properties Of New Potentially Chemotheraputic [Sic] Pteridine Derivatives, Walter Wesley Parish
Theses and Dissertations
A new general synthetic method for the preparation of 6-thiopteridines has been developed. The method involves the addition of thiols to intermediate pyrimidine nitrones formed in situ by the reaction of 4-amino-5-nitrosopyrimidines with pyridinium-activated acetonitriles, acetates, acetophenones, and other methylketones. Ca. forty new pteridines were prepared by this method. The preparation of six new 6-pteridinyl ketones, two new 6- pteridinyl ketone thiosemicarbazones, and two new 6-sulfonylpteridines and their 4-acetamido derivatives is also reported. 4-Acetamido-2- amino-7-phenylpteridine 5-oxide was prepared by the reaction of 2- amino-4,6-diacetamido-5-nitrosopyrimidine with either phenylsulfonyl-acetophenone or phenacylpyridinium bromide. Evidence relating to the structure of the acylated 4-amino-5- nitrosopyrimidines …
The Enzymatic Oxidation Of Aldehydes By Xanthine Oxidase, Duane Beal Gregory
The Enzymatic Oxidation Of Aldehydes By Xanthine Oxidase, Duane Beal Gregory
All Master's Theses
As early as sixty years ago, the existence of an enzyme from mammalian tissues which catalyzed the oxidation of xanthine and hypoxanthine was recognized. The name given the enzyme was derived from its earliest recognized action, hence xanthine oxidase. Although little is known about the biological functions of the enzyme, the high affinity shown for xanthine and hypoxanthine may indicate that these are the most significant substrates biologically.
The Chemistry Of Trifluorothiolacetic Acid, Patricia Diane Weeks
The Chemistry Of Trifluorothiolacetic Acid, Patricia Diane Weeks
Dissertations and Theses
Addition reactions of perfluorothiolacetic acid (TFTAA) with organic and inorganic substrates were studied and six new compounds containing the trifluoroacetyl group have been prepared. Two types of reactions were observed, free radical and nucleophilic addition. Under the influence of ultraviolet light, TFTAA (CF₃COSH) adds to olefins to form 1:1 adducts. The CF₃COS• radical appears to be the adding species. Three new olefin adducts were prepared: CF₃COSCFHCF₂H, CF₃COSCH₂CF₂H, and CF₃COSCH₂CFH₂. In addition, this was found to be a new way to prepare CF₃COSCH₂CH₃, which had been previously prepared by another route. Physical constants, analytical data, infrared, ultraviolet, nmr and mass spectra …
Donor Properties Of Dimethylsulfoniumcyclopentadienylide And Tetramethylenesulfoniumcyclopentadienylide In Metal Complexes ; Part Ii. The Attempted Preparation Of Boron Tricyanide, Gary Scott Barney
Theses and Dissertations
Part I.--Complexes of dimethylsulfoniumcyclopentadientylide and tetramethylenesulfoniumcyclopentadienylide with metal ions were studied in order to determine the coordination site on the ylids. Infrared spectra indicate that the ylids are coordinated through the cyclopentadienyl ring in all complexes except for the Hg(CN)2 complexes. Coordination-of the HgI2, CdI2, ZnCl2, and AgNO3 complexes is through the number one position on the ring as suggested by NMR data. Infrared and NMR data strongly indicate that the ylids in the Hg(CN)2 complexes are coordinated through sulfur. Part II.--The only method given in the chemical literature for the preparation of boron tricyanide could not be duplicated in …
The Photochemical Reduction Of Octacyanomolybdate(V) Ion In Aqueous Solutions, Gordon W. Gray
The Photochemical Reduction Of Octacyanomolybdate(V) Ion In Aqueous Solutions, Gordon W. Gray
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The photochemical reactions occurring in aqueous solutions of octacyanomolybdate(V) ion, Mo(CN)83-, during irradiation with light of 365 and 436 nm wavelengths were studied. The quantum yields and reaction products were determined for neutral, unbuffered solutions as well as solutions buffered at pH 4.0, 7.0, and 9.0.
The results of these studies showed that the Mo(CN)83- ion is rapidly reduced by light to a Mo(IV) complex. In neutral or acidic media, the initial photoreduction product was found to be the red heptacyanoaquomolybdate(IV) ion, Mo(CN)7(H2O)3-. Photolysis in basic solution gave the …
A Dialyzable Phospholipid Renin Inhibitor, Donna L. Webber
A Dialyzable Phospholipid Renin Inhibitor, Donna L. Webber
Senior Scholar Papers
Crude renin preparations from steer kidneys were incubated with Cd2+ and with Zn2+ elevation of renin activity resulted in both preparations. Analyses of each preparation against Tris-saline, and finally EDTA, removed the cations; however, renin activity remained elevated. An indirect activation of Renin by Cd2+ and, to a lesser extent, Zn2+, was thus demonstrated. Removal of the cations by Tris-saline and DTA-dialyses was suspected to involve the loss by dialysis of a renin inhibitor. An isolation technique for a proposed phospholipid renin inhibitor similar to bovine phosphatidylserine, reported by another laboratory, was thought to be unnecessarily arduous due to the …
A Study Of Substituent Effects In Selected Aromatic Systems By Nuclear Magnetic Resonance Spectroscopy, Carol K. Haas
A Study Of Substituent Effects In Selected Aromatic Systems By Nuclear Magnetic Resonance Spectroscopy, Carol K. Haas
Chemistry Honors Papers
This 53 page thesis builds upon previous work investigating substituent effects on nuclear magnetic resonance spectroscopy parameters.