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  Partner: UNT Libraries
 Degree Discipline: Chemistry
 Collection: UNT Theses and Dissertations
a-Amino Alcohol Derivatives of Methyl P-Nitrophenyl Acetate

a-Amino Alcohol Derivatives of Methyl P-Nitrophenyl Acetate

Date: 1947
Creator: Prindle, Hershel B.
Description: This thesis describes the synthesis of a series of dialkylaminoalkoxy derivatives of methyl p-nitrophenylacetate for testing as anti-histamine or hay fever drugs.
Contributing Partner: UNT Libraries
Analysis of Acid Gas Emissions in the Combustion of the Binder Enhanced d-RDF by Ion Chromatography

Analysis of Acid Gas Emissions in the Combustion of the Binder Enhanced d-RDF by Ion Chromatography

Date: August 1988
Creator: Jen, Jen-Fon
Description: Waste-to-energy has become an attractive alternative to landfills. One concern in this development is the release of pollutants in the combustion process. The binder enhanced d-RDF pellets satisfy the requirements of environmental acceptance, chemical/biological stability, and being storeable. The acid gas emissions of combusting d-RDF pellets with sulfur-rich coal were analyzed by ion chromatography and decreased when d-RDF pellets were utilized. The results imply the possibility of using d-RDF pellets to substitute for sulfur-rich coal as fuel, and also substantiate the effectiveness of a binder, calcium hydroxide, in decreasing emissions of SOx. In order to perform the analysis of the combustion sample, sampling and sample pretreatment methods prior to the IC analysis and the first derivative detection mode in IC are investigated as well. At least two trapping reagents are necessary for collecting acid gases: one for hydrogen halides, and the other for NOx and SOx. Factors affecting the absorption of acid gases are studied, and the strength of an oxidizing agent is the main factor affecting the collection of NOx and SOx. The absorption preference series of acid gases are determined and the absorption models of acid gases in trapping reagents are derived from the analytical results. To prevent ...
Contributing Partner: UNT Libraries
An Analysis of the Effectiveness of Computer Assisted Instruction in General Chemistry at an Urban University.

An Analysis of the Effectiveness of Computer Assisted Instruction in General Chemistry at an Urban University.

Date: May 2002
Creator: McGuffey, Angela
Description: The science-major General Chemistry sequence offered at the University of Houston has been investigated with respect to the effectiveness of recent incorporation of various levels of computer technology. As part of this investigation, questionnaire responses, student evaluations and grade averages and distributions from up to the last ten years have been analyzed and compared. Increased use of web-based material is both popular and effective, particularly with respect to providing extra information and supplemental questions. Instructor contact via e-mail is also well-received. Both uses of technology should be encouraged. In contrast, electronic classroom presentation is less popular. While initial use may lead to improved grades and retention, these levels decrease quickly, possibly due to a reduction in instructor spontaneity.
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The Analysis of Volatile Impurities in Air by Gas Chromatography/Mass Spectrometry

The Analysis of Volatile Impurities in Air by Gas Chromatography/Mass Spectrometry

Date: May 1993
Creator: Talasek, Robert Thomas
Description: The determination of carbon monoxide is also possible by trapping CO on preconditioned molecular sieve and thermal desorption. Analysis in this case is performed by gas chromatography/mass spectroscopy, although the trapping technique is applicable to other suitable GC techniques.
Contributing Partner: UNT Libraries
An Application of the Reformatsky Reaction to the Thiophene Series of Compounds

An Application of the Reformatsky Reaction to the Thiophene Series of Compounds

Date: 1949
Creator: Hicks, Howard A.
Description: In view of the increasing importance of thiophene derivatives as chemotherapeutic agents, it was considered of interest to apply the Reformatsky reaction to the synthesis of compounds containing the thiophene nucleus with the thought that these might serve as intermediates for further syntheses.
Contributing Partner: UNT Libraries
Applications of Nanomanipulation Coupled to Nanospray Mass Spectrometry in Trace Fiber Analysis and Cellular Lipid Analysis.

Applications of Nanomanipulation Coupled to Nanospray Mass Spectrometry in Trace Fiber Analysis and Cellular Lipid Analysis.

Date: December 2008
Creator: Ledbetter, Nicole
Description: The novel instrumentation of nanomanipulation coupled to nanospray mass spectrometry and its applications are presented. The nanomanipulator has the resolution of 10nm step sizes allowing for specific fine movement used to probe and characterize objects of interest. Nanospray mass spectrometry only needs a minimum sample volume of 300nl and a minimum sample size of 300attograms to analyze an analyte making it the ideal instrument to couple to nanomanipulation. The nanomanipulator is mounted to an inverted microscope and consists of 4 nano-positioners; these nano-positioners hold end-effectors and other tools used for manipulation. This original coupling has been used to enhance the current abilities of cellular probing and trace fiber analysis. Experiments have been performed to demonstrate the functionality of this instrument and its capabilities. Histidine and caffeine have been sampled directly from single fibers and analyzed. Lipid bodies from cotton seeds have been sampled indirectly and analyzed. The few applications demonstrated are only the beginning of nanomanipulation coupled to nanospray mass spectrometry and the possible applications are numerous especially with the ability to design and fabricate new end-effectors with unique abilities. Future study will be done to further the applications in direct cellular probing including toxicology studies and organelle analysis of ...
Contributing Partner: UNT Libraries
Applications of Single Reference Methods to Multi-Reference Problems

Applications of Single Reference Methods to Multi-Reference Problems

Date: May 2015
Creator: Jeffrey, Chris C.
Description: Density functional theory is an efficient and useful method of solving single-reference computational chemistry problems, however it struggles with multi-reference systems. Modifications have been developed in order to improve the capabilities of density functional theory. In this work, density functional theory has been successfully applied to solve multi-reference systems with large amounts of non-dynamical correlation by use of modifications. It has also been successfully applied for geometry optimizations for lanthanide trifluorides.
Contributing Partner: UNT Libraries
An Approach Towards the Total Synthesis of Clonostachydiol

An Approach Towards the Total Synthesis of Clonostachydiol

Date: August 1995
Creator: Maiti, Tushar B. (Tushar Baran)
Description: The syntheses of the unsymmetrical 14-membered bismacrolides have been reviewed. A total synthesis of clonostachydiol, the latest to join this family, has been attempted using trimethylsilyl acetylene as the builiding block and palladium catalyzed reactions for the formation of key bonds. The alkyne groups were introduced by Stille coupling of trimethylstannylethynyltrimethylsilane with an acid chloride for one fragment and by addition of lithiotrimethylsilyl acetylene to an aldehyde for the other. Lactic acid derivatives were chosen as starting materials for both fragments, thus introducing two of the chiral centers. The remaining stereocenters were introduced using stereoselective reductions of ketones.
Contributing Partner: UNT Libraries
Aromatic Amino Acid Studies

Aromatic Amino Acid Studies

Date: December 1970
Creator: Sullivan, Patrick Timothy
Description: Pyridine ring analogs of the aromatic amino acids phenylalanine and tyrosine were synthesized and studied in microbiological and mammalian systems.
Contributing Partner: UNT Libraries
The Ascorbic Acid Metabolism of Fifty College Women in the North Texas State Teachers College

The Ascorbic Acid Metabolism of Fifty College Women in the North Texas State Teachers College

Date: 1943
Creator: Harshbarger, Marjorie
Description: A study of the ascorbic acid metabolism of a group of fifty college women in the North Texas State Teachers College between the months of April and July, 1943.
Contributing Partner: UNT Libraries
Attempted Synthesis of 5-Allyl-5-(2-Thienyl)-Barbituric Acid

Attempted Synthesis of 5-Allyl-5-(2-Thienyl)-Barbituric Acid

Date: 1947
Creator: Skinner, Charles Gordon
Description: This thesis describes attempts to synthesize 5-allyl-5-(2-thienyl)-barbituric acid as an improved anticonvulsant.
Contributing Partner: UNT Libraries
Attempted Synthesis of Dibarbituric Acid

Attempted Synthesis of Dibarbituric Acid

Date: 1944
Creator: Pickard, Porter Louis
Description: This study is an attempted synthesis of dithienyl barbituric acid.
Contributing Partner: UNT Libraries
The Attempted Synthesis of some Heterocyclic Sulfones

The Attempted Synthesis of some Heterocyclic Sulfones

Date: 1949
Creator: Compton, William David
Description: This thesis describes two experiments: one related to antihistamines, and the other related to antitubercular compounds.
Contributing Partner: UNT Libraries
Baeyer-Villiger Oxidation of 1,7- & 1,9-dibromopentacyclo[5.4.0.02,6.03,10.05,9]undecane-8,11-dione

Baeyer-Villiger Oxidation of 1,7- & 1,9-dibromopentacyclo[5.4.0.02,6.03,10.05,9]undecane-8,11-dione

Access: Use of this item is restricted to the UNT Community.
Date: May 2004
Creator: Akinola, Adeniyi O.
Description: Baeyer-Villiger oxidation of 1,9-dibromopentacyclo[5.4.0.02,6.03,10.05,9]undecane-8,11-dione (1,9-dibromo-PCU-8,11-dione) was performed by using an excess amount of m-chloroperbenzoic acid (3 equivalents) and resulted in the formation of the corresponding monolactone. The reaction would not proceed to the dilactone stage. The structure of the reaction product was established unequivocally via single crystal X-ray diffraction. Baeyer-Villiger oxidation of 1,9-dibromo-PCU-8,11-dione using ceric ammonium nitrate (CAN) was also performed and afforded a mixture of lactones. Only one of these lactones, which also contained an alkene functionality, could be isolated and characterized. 1,7-dibromo-PCU-8,11-dione was also reacted with CAN, yielding the mono-lactone, which has also been characterized.
Contributing Partner: UNT Libraries
Barbituric Acids as Anticonvulsants.  IV.  5-Substituted-Mercapto Derivatives of 5-Phenylbarbituric Acids.

Barbituric Acids as Anticonvulsants. IV. 5-Substituted-Mercapto Derivatives of 5-Phenylbarbituric Acids.

Date: 1951
Creator: Shahan, Howard Wayne
Description: This study involves compounds of the barbituric acid series are well known for their use as anesthetics and sedatives.
Contributing Partner: UNT Libraries
Barbituric Acids. VI. 5-substituted-mercapto Derivatives of 5-ethylbarbituric Acid

Barbituric Acids. VI. 5-substituted-mercapto Derivatives of 5-ethylbarbituric Acid

Date: June 1954
Creator: Jeanes, Cecil Byron
Description: The reaction of 5-bromo-5-ethylbarbituric acid with mercaptan and pyridine in cold ether solution was studied and was found to be satisfactory for the preparation of the compounds reported in this work.
Contributing Partner: UNT Libraries
Barbituric Acids.  VII.  5-alkyl-derivatives of 5-ethoxy-barbituric Acid

Barbituric Acids. VII. 5-alkyl-derivatives of 5-ethoxy-barbituric Acid

Date: January 1955
Creator: Hyde, Harold Wayne
Description: A great deal of research has been devoted in recent years to the search for new drugs for the treatment of epilepsy and related convulsive disorders. This emphasis is occasioned by the fact that no one drug is effective for all patients, and also by the fact that the toxicity of a drug varies considerably from one patient to another. Among the most effective drugs are certain members of the hydantoin and barbituric acid series. For some time there has been in progress in this laboratory an investigation of members of these two series in which a hetro atom attached directly to the hetrocyclic nucleus is introduced into the side chain at position five of these two series.
Contributing Partner: UNT Libraries
Barbituric Acids. VIII. 5-substituted-5-(1-pyrrolidyl)barbituric Acids

Barbituric Acids. VIII. 5-substituted-5-(1-pyrrolidyl)barbituric Acids

Date: 1957
Creator: Compton, Ross Davis
Description: The purpose of this investigation then was the preparation of a series of 5-substituted-5-(1-pyrrolidyl)barbituric acids in which R would consist of alkyl groups ranging in size from methyl to amyl, and other groups such as phenyl and benzyl. These compounds are to be tested elsewhere for hypnotic and anticonvulsant activity.
Contributing Partner: UNT Libraries
Barbituric Acids.  V.  5-substituted-mercapto Derivatives of 5-isoamylbarbituric Acid

Barbituric Acids. V. 5-substituted-mercapto Derivatives of 5-isoamylbarbituric Acid

Date: August 1952
Creator: Peterson, Paul Eugene
Description: Since no mention has been found in the literature of any 5-substituted mercapto-5-alkyl derivatives of barbituric acid, it was thought to be of interest to prepare a series of compounds containing sulfur attached directly to the barbituric acid nucleus. 5-substituted mercapto-5-isoamylbarbituric acids were chosen as representative of barbituric acids in which the alkyl group has a fairly high molecular weight.
Contributing Partner: UNT Libraries
Base Effects on the Thermal Decomposition of Sec-butyllithium Solutions

Base Effects on the Thermal Decomposition of Sec-butyllithium Solutions

Date: June 1966
Creator: Adams, George Michael
Description: The pyrolysis of sec-butyllithium in solution was studied in an attempt to understand the loss of stereo-specificity and the atypical kinetics that have been reported. Additionally, the effect of added lithium alkoxides was studied to determine their effects on the highly reactive sec-butyllithium substrate.
Contributing Partner: UNT Libraries
Biological Inhibitors

Biological Inhibitors

Date: December 1971
Creator: Sargent, Dale Roger
Description: Four isosteric series of plant growth-regulating compounds were prepared. Using an Avena sativa coleptile assay system, derivatives in series I and IV inhibited segment elongation to a greater degree than did comparable derivatives in series II and III.
Contributing Partner: UNT Libraries
Bis Ammonium Salts of Dialkylaminoalkoxypropionitriles

Bis Ammonium Salts of Dialkylaminoalkoxypropionitriles

Date: August 1957
Creator: Woods, Roy Jack
Description: This paper concerns the preparation of some bis derivatives of dialkylaminoalkoxypropionitirles from trimethylene, hexamethylene, octomethylene, and decamethylene bromides. These compounds are to be tested for curariform activity and anesthetic values by Parke, Davis and Company.
Contributing Partner: UNT Libraries
Bonding Studies in Group IV Substituted n,n-dimethylanilines

Bonding Studies in Group IV Substituted n,n-dimethylanilines

Date: December 1971
Creator: Drews, Michael James
Description: The purpose of the present work is to study the effects of the trimethylsilyl and trimethylgermyl substituents on the N,N-dimethylamino ring system. Both ground and excited state interactions were studied and their magnitudes determined. The experimental data were then used in conjunction with molecular orbital calculations to differentiate among, and determine the importance of, d-p bonding, hyperconjugation or polarization of the trimethylsilyl group on the ground and excited state bonding.
Contributing Partner: UNT Libraries
Bonding Studies on Organolithium Compounds

Bonding Studies on Organolithium Compounds

Date: August 1968
Creator: Peyton, Gary
Description: This study is concerned with the nature of the relatively unusual bonding which occurs in organolithium compounds as a direct result of the oligomerization and possible explanations for that bonding.
Contributing Partner: UNT Libraries