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The Urea Adducts Of Certain Esters Containing Twenty Carbons, Donald Eugene Johnson

University of the Pacific Theses and Dissertations

Urea has the interesting and unexpected property of forming solid complexes with many straight-chained organic compounds. So selective is the formation of these complexes with linear aliphatic compounds that it provides a means of separation form the analogous branched and cyclic compounds. Linear esters derived from normal saturated and unsaturated esters give adducts also but not to the same extent. Although many linear aliphatic compounds form adducts, the compounds so formed have varying degrees of stability depending on molecular weight, saturation and the shape of the molecule.

The purpose of this investigation is to determine the effect of the position …

The Effect Of Cross-Linkage On Internal Diffusion In Dowex-50 Ion Exchange Resin, John Paul Peterson Jr.

University of the Pacific Theses and Dissertations

As far back as the time of Aristotle sand filters were used to purify water. However it was not until the time of Thompson and Way (1848), two English agricultural chemists, that the idea of actual exchange of ions was proposed. Ion exchange has been investigated extensively, resulting in applications to softening of water, purification of sugar, separation of compounds, recovery of metals, many pharmaceutical separations and many others.

It has been proposed that the internal diffusion should be related to the internal structure of the ion exchange resin. The object of this research was to measure the internal diffusion …

Thiocyanate Complexes Of Osmium, Craig Albert Townsend Jr.

University of the Pacific Theses and Dissertations

Osmium is a hard grey brittle metal which scratches glass. It has a melting point of 2700[degree]C, and a specific gravity of 22.4, which is greater than any other known substance. The grey color of osmium resembles the grey color of iron and ruthenium. Osmium was discovered in 1803 by Tennant in the insoluble residue remaining after treating an alloy of the platinum metals with acid.

Osmium occurs in nature alloyed with the other metals of the platinum group. One type of alloy includes all six of the of the platinum metals, osmium, iridium, platinum, ruthernium, rhodium and palladium. Osmium …

A Study Of The Kinetics And The Free Radicals Involved In The Low-Pressure, Vapor-Phase Pyrolysis Of Toluene, Robert E. Williams

Chemistry and Chemical Biology ETDs

The separation of lanthanum, yttrium, and the rare earth elements from their ores has been a challenge to the chemist for many years. The similarities in chemical properties has made their separation a problem of extraordinary difficulty. Fractional crystallization has been the classical method utilized in the past, although individual elements have been isolated by oxidization or reduction to other than the tripositive oxidation state (1). Recently ion exchange and solvent extraction methods have become more important as a means of separation of these elements. Both of these techniques depend upon fractional differences in the distribution of compounds or ions …

The Separation Of Antimony 125 From Solutions Of Neutron Irradiated Tin Salts, Joseph D. Robinson

Chemistry and Chemical Biology ETDs

Because of the importance of high specific activities of radioactive species considerable experimental work has been done on the preparation of "carrier-free" tracers. In surveying the literature on the preparation of carrier-free antimony only one method was found. The method reported involves the deuteron bombardment of tin; solution of the target in agua regia; addition of cadmium carrier; precipitation of the cadmium as the sulfide which carries antimony, using oxalate ion to complex the tin; solution to the sulfides of cadmium and antimony in concentrated hydrochloric acid; distillation of tin from cadmium and antimony contained in in perchloric acid with …

The Reactivity Of Alpha Beta-Unsaturated Alkyl Ethers With Grignard Reagents, Solomon C. Westbrook Jr.

Tennessee State University Alumni Theses and Dissertations

No abstract provided.

The Synthesis And Properties Of Five Alph= (Para-Tertiary-Butylphenoxy) Fatty Acids And Acid Chlorides And Catalytic Hydrogenation Of Several Aryloxy Substituted Ketene Monomers And Dimers, Albert O. Williams

Tennessee State University Alumni Theses and Dissertations

No abstract provided.

Collector-Depressant Equilibria For The Flotation System Potassium Ethyl Xanthate-Potassium Cyanide-Molybdenite, Connell Bolton Roberts

Theses and Dissertations

This dissertation involves a study of the collector-depressant equilibria of the flotation system potassium ethyl xanthate-potassium cyanide-molybdenite, based upon mineral-air bubble contact measurements made by a modified captive bubble technique. The Cook theory of single site free acid adsorption is used to interpret the data. The standard free energies of adsorption of ethyl xanthic acid and hydrocyanic acid on molybdenite are calculated.

Thermodynamic Properties Of Water Absorbed On Silica, Conrad V. Hatch

Theses and Dissertations

The object of the work presented in this thesis was to obtain quantitative values of the thermodynamic changes in water upon adsorption by silica. Two methods were used. The first was a determination of the differential entropy and heat of adsorption independent of any theory of adsorption. The second method included a new interpretation of the "c" constant of the Brunauer, Emmett, and Teller Theory in which c was expressed in terms of the standard free energy of adsorption. The experimental data gave satisfactory results in determining the differential heat and entropy of adsorption. The results obtained in determining the …

Polargraphic Measurement Of Reaction Rates Of Diazonium Salts, Gregory W. Daues

Chemistry and Chemical Biology ETDs

If a colorimetric method is used for following the reactions by tracing the increase in dye concentration, only reactions which form soluble dyes can be studied. Gasometric techniques are limited in that a sample must be removed from the reaction vessel and the diazonium salt decomposed by means of a catalyst in order to measure the liberated nitrogen. The latter method of analysis lends itself more readily to studies of the rate of decomposition of diazonium salts under various conditions, such as, the presence of ultra-violet light or exposure to high temperatures.

The Kinetics Of The Exchange Between Diiodotyrosine And Iodine, Alfred H. Zeltzmann

Chemistry and Chemical Biology ETDs

The rate of exchange of iodine with diiodotyrosine in squamous solution was studied as a function of the concentrations of both reactants, of the pH, and of the temperature. The concentration of diiodotyrosine was varied from 0.0000475 to 0.01251 moles per liter and that of the iodine from 0.0000103 to 0.000395 moles per liter. The upper limits of concentration studied were determined by the solubilities of both the iodine and diiodotyrosine. The ratio of concentration of diiodotyrosine to that of iodine was varied from 227 to 0.5, the temperature was varied from 25.1° C to 42.1° C, and the pH …

The Analysis Of Brass And Bronze For Aluminum, Gordon Kenneth Gregory

Bachelors’ Theses

The problem of the analysis of brass and bronze for aluminum is one that has received the attention of analytical chemists for decades. The problem was originally proposed to me by Mr. H.E. Gregory of the American Brass Company. Since there appears to be no direct way of determining aluminum in brass and bronze, this thesis will concern itself with a comparison of four methods of determination with emphasis on their relative advantages and disadvantages. The gathering and arranging of the steps in the methods were done by the author, although the steps themselves have been described in chemical literature.

Separation Of Amines And Alkanolamines By Means Of Paper Partition Chromatography, Kenneth A. Waehner

Bachelors’ Theses

The amines may be regarded as derivatives of the hydrocarbons in which a hydrogen atom has been replaced by an amino group; or as derivatives of ammonia in which one or more hydrogen atoms have been replaced by alkyl groups. They may be classified according to structure as primary (R-NH2), secondary (¾-NH) and tertiary (R3-N) amines. In a similar way, ammonium halides or hydroxides may have one or more hydrogen atoms of the ammonium group replaced by alkyl groups to give alkylammonium, dialkylammonium, trialkylammonium and tetraalkylammonium halides or hydroxides.

The Separation Of Ethylene Diamine, Morpholine, And M-Toluidine By Means Of Paper Chromatography, Domenick S. Bruno

Bachelors’ Theses

"No other discovery has exerted as great an influence and widened the .field of investigation of the organic chemist as much as Tswett's discovery. or Chromatographic Adsorption Analysis 1n 1906".

In 1910 Tswett's comprehensive work "Chromophylls in the Plant and Animal World" was published. Tswett's fundamental experiments consisted or extracting the color from dried leaves with petroleum ether. He poured the extract through a compressed column or finely powdered calcium carbonate. The column was attached to a filter flask and the solution drawn through. He found that the apparently homogeneous pigment separated into colored bands along the column as the …

Preparation Of Vanillic Acid And Some Of Its Metallic Salts, Elaine A. Dittmar

Bachelors’ Theses

Very little work has been done with vanillic acid and its derivatives since the time when the acid was first synthesized. There are usually good reasons why compounds showing such important properties as food preservatives have lain idle for over seventy-five years. It is of great. interest to know the reasons behind this idleness and also to attempt to prepare some of the derivatives heretofore unreported.

This is the purpose for which this thesis has been written; that a little more knowledge will be contributed to a relatively virgin field. Submitted are the preparation of vanillic acid and some of …

Collector-Depressant Equilibria In The Flotation Of Molybdenite, Robert Létrenne Andelin

Theses and Dissertations

This dissertation presents the results of research on the flotation system potassium n-amyl xanthate - sodium sulfide - molybdenite. The purposes of the research were (1) to determine the theoretical collector-depressant equilibria conditions of this system necessary for the flotation or depression of molybdenite, (2) to ascertain the mechanism of adsorption or the collector potassium n-amyl xanthate and the depressant sodium sulfide on molybdenite, and (3) to calculate the standard free energy of adsorption on molybdenite of the collector and depressant in this system. To accomplish these purposes it was necessary to develop a satisfactory experimental method for the controlled …

The Teaching Of Science, Sherwin Maeser

Faculty Honor Lectures

Like to teach! Whether with the expectant, half-frightened freshman, the senior, worried about his preparation now that . he must get out and meet competition, or the graduate student interested in new discoveries, I like to work with all of them.

I have been teaching a long time now. As has always been the case when one generation is thinking of turning over its work to the next, I am glad to have the opportunity to talk about some of the things that I consider important in this job of teaching.

The most varied and the most acute problems of …

Use Of P32, Sr89, And Ca45 In Mechanical Dishwashing Studies, A. T. Martin, C. H. Shiflett, J. L. Wilson

Journal of the Minnesota Academy of Science

No abstract provided.

Chemical Magic Experiments, Leonard A. Ford

Journal of the Minnesota Academy of Science

No abstract provided.

Phase Diagram: Sulfur In Beta-Phenylethyl Bromide, Robert L. Kling

Bachelors’ Theses

In this work I wish to apply the phase rule to a particular mixture of sulfur in beta-phenylethylbromide. Through experimental data it will be shown how various concentrations change the temperature in the phases or what the temperature is for various concentrations of sulfur in the solvent beta-phenylethylbromide.

The Effect Of Riboflavin, Nicotinic Acid, And Thiamine On The Lipolytic Action Of Pancreatic Lipase, John G. Georgatsos

Bachelors’ Theses

The writer became especially interested in vitamins and enzymes during the course in the chemistry of Nutrition. To a person that has not studied them close enough the enzymes and the vitamins would seem to be miracle substances rather than chemical entities governed by laws. It was during that period that I made up my mind to study the Interrelation existing between the enzymes and the vitamins when the time would come for me to write a thesis. For this reason it is my pleasure to express my deepest appreciation to Dr. John R. Koch, Director of the Chemistry Department …

The Rate Of Hydrolysis Of Ethyl-Α-Β-Dibromopropionate, Earl Ney

Bachelors’ Theses

Experimentation on the rate of hydrolysis of esters is preceded only by the rate of inversion of cane sugar started by Wilhemy in 1850. However, work on ester hydrolysis soon took the stage in preference as the reaction most favorable to the study of reaction rates. Ostwald's work on the rate of hydrolysis of ethyl acetate in 1884 was the first monumental work and experimentation then proceeded so rapidly that in 1889 Arrhenius' theory of hydrogen ion catalysis and later the dissociation theory itself was born and nursed. Yes, nursed by many more ester hydrolysis experiments which built up such …

The Content Of Pantothenic Acid, Folic Acid And Vitamin B12 Like-Activity In Alfalfa Hay Grown In Utah Soils Treated With Different Fertilizers, Buranaphoka Kashemsri

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Vitamins play an important role in the nutrition of man and animal. As early as 1897 Eijkman was able to demonstrate the symptoms of thiamine deficiency disease in birds. Since then, vitamins have been regarded as one of the most essential factors in nutrition. Only small quantities in the diet are necessary, yet lack of any of them will inhibit the growth and produce certain kinds of deficiency diseases.

Further Studies Of The Reactions Of Quinoxaline And 2-Methylquinoxaline, Marcus N. Myers

Theses and Dissertations

The present investigation was also made with the object of preparing the vinylquinoxalines and studying their 1,4- addition reactions. The attempts to prepare vinylquinoxalines were unsuccessful. However, sodium acetylide reacted with 2,3-dichloroquinoxaline to give a new compound which (from its analysis and properties) appears to be 2,3-bis(1-hydroxyethyl) quinoxaline . This new compound should be investigated further , as it may prove to be an intermediate in the preparation of vinylquinoxalines. The preparation of 2-methylquinoxaline has become very simple by the use of the method of Jones, Kornfeld and McLaughlin^5, which consists of condensing o-phenylenediamine with pyruvic aldehyde. The condensation of …

Some Reductions Of Substituted Benzalacetophenones By Aluminum Isopropoxide And Lithium Aluminum Hydride, Calvin Lyndall Fisher

Master's Theses

While the literature contains a lnrge volume of material on the reduction of carbonyl compounds, the historical section of this thesis will be chiefly con­cerned with the reduction of -- unsaturated carbonyl compounds by catalytic hydrogenation, metal combinations, aluminum alkoxides and by lithium aluminum hydride.

The purpose of this thesis is to study the effect various substituents have on a conjugated system when the system is undergoing reduction by lithium aluminum hydride.

A Study Of The Exchange Between P-Nitrobenzyl Iodide And Iodide Ion In Alcoholic Solutions, E. Lee Purlee

Chemistry and Chemical Biology ETDs

The recent work of Stillson concerning the kinetics of exchange between benzyl iodide and iodide ion in various solvents has given impetus to the investigation of similar exchanges with substituted benzyl iodide.

Urea Adducts Of The Esters Of Stearic Acid, Paul Elliott Greene

University of the Pacific Theses and Dissertations

Urea forms crystalline complexes with n-alkanes and their liner derivatives but not with most branched and cyclic hydrocarbons and their derivatives. The compounds are stable enough to be used in separating these types of aliphatic compounds from their branched and cyclic analogs. Linear esters derived from normal saturated acids give adducts as expected. Urea complexation was found to be of great importance in the purification and separation of unsaturated esters of high molecular weight.

The object of the present research was to investigate the compositions of urea adducts of various long-chain esters, approaching the class of waxes, to test various …

The Reaction Of Organomagnesium Compounds With Triketones., Reuben F. Miller

LSU Historical Dissertations and Theses

No abstract provided.

A Special Study Of The Alpha-Chlorinated Toluenes And Their Mono Deuterium Derivatives., Stuart Baker Eglin

LSU Historical Dissertations and Theses

No abstract provided.

A Study Of Temperature Effect On Adsorption Chromatography., Lie Tien Chang

LSU Historical Dissertations and Theses

No abstract provided.