Chemistry Commons^™

Enrichment Of Tin Activity Through The Szilard-Chalmers Separation, Herta W. Spano

Chemistry and Chemical Biology ETDs

It was the purpose of this investigation to utilize the Szilard-Chalmers reaction in order to prepare tin solutions of high specific activity.

Tetraphenyl tin was chosen for the target compound. It is a white, crystalline solid of excellent thermal stability. No data have been reported in the literature on the rate of exchange between inorganic forms of tin and tetraphenyl tin but it seemed highly probable that this exchange would be very slow. Tetraphenyl tin is soluble in various organic solvents but insoluble in water, and this suggested solvent extraction as a possible means of separation of the activated tin …

Derivatives Of M-Xylene, Henry J. Muller

Chemistry and Chemical Biology ETDs

Since m-xylene of 95-98% purity has recently become available from petroleum, this is an appropriate time to prepare an examine its derivatives. Isophtalic and m-toluic acids can be prepared from the hydrocarbon. The purpose of this work was to prepare imidazolines from these acids

The Chemical Characteristics Of 8.0-Day I131 Produced By The Beta Decay Of 25-Minute Te131 In Organic Liquids, Francis J. Keneshea Jr.

Chemistry and Chemical Biology ETDs

In 1934 Szilard and Chalmers found that a large fraction of the radioactive iodine produced in the thermal neutron irradiation of ethyl iodide could be extracted from the irradiated material. The procedure followed was to add a trace of carrier iodine to the irradiated liquid, extract the iodine with an aqueous solution of a reducing agent and precipitate the iodide as silver iodide. The silver iodide precipitate obtained in this manner contained a large fraction of the iodine activity (25-minute I¹²⁸), at a high specific activity. Since ethyl iodide is not soluble in water and hence is not …

The Kinetics Of The Exchange Between Benzyl Iodide And Iodide Ion, Paul Stillson

Chemistry and Chemical Biology ETDs

A general form of an ion-molecule replacement reaction occurring at a saturated carbon atom may be represented by

Y^-+R-X⇋Y-R+X^-

where Y- is a negatively charged atom or group which can replace an atom or group X in the molecule R-X and R is any organic radical which is saturated at the point of attachment of X. The mechanisms which have been postulated for the above reaction may be divided into the following two groups: (1) those which assume primary dissociation of the neutral organic reaction into ions as the rate-determining step; (2) those which postulate the formation …

The Kinetics Of The Exchange Between Sn(Ii) And Sn(Iv) In Absolute Alcohol, E. Gerald Meyer

Chemistry and Chemical Biology ETDs

The radiochemical exchange reaction may in general be written AX+BX^• = +BX where X^• represents a radioactive atom of X. The species AX and AX^• are assumed to be chemically identical as are the species BX and BX^•. This assumption introduces no appreciable error even when working with atoms having an atomic weight as low as fourteen.

Some Reactions Of 4-Chlorocinnoline, F. H. Kruse

Chemistry and Chemical Biology ETDs

This problem involves the preparation of 4-chlorocinnoline by the method of Borshe and Herbert and Busch and Rast,^, and the study of further replacement reactions of the chlorine atom in the 4-position. The problem can be subdivided into two sections: (1) the preparation of the 4-cinnolyl Grignard reagent and the corresponding lithium compound and (2) the study of some condensation reactions of 4-chlorocinnoline.

An Analytical Study Of Berberine, W. Riley Mcgaughran

Chemistry and Chemical Biology ETDs

Berberine, an alkaloid, has unique pharmacological properties as well as unusual chemical and physical characteristics. This compound has been used for many years as a remedy for eye diseases. In contrast to most alkaloids, berberine hydroxide is more soluble than its salts. Its chemical structure has been established, but a correlations of many of its properties and its structures has not been made.

The purpose of this work was to undertake an analytical study of berberine, hoping to collect data which would make possible the correlation of certain properties of the compound with its structure. The study was planned to …

A Study Of The Use Of The Dicyanatodipyridine (Ii) Complex For The Determination Of Cyanate, Jean Mcclelland

Chemistry and Chemical Biology ETDs

Treadwell states in his text, Analytical Chemistry, Volume II, that "the only method for examining cyanates consists in determining the amount of carbon and nitrogen present by combustion." A review of the available literature shows that, although this is not literally true, a procedure for this quantitative determination of small amounts of cyanates in the presence of interfering substances is lacking.

A survey of the literature yielded few references for instrumental methods for the quantitative determination of cyanates. Ripan-Tilici published a method for the determination of cyanates poteniometrically, but attempts to duplicate her work have failed. Madame Tilici, in …

The Syntheses And Ultraviolet Absorption Spectra Of 2-Imidazolines, 2-Imidazolidones And Imidazolidines, Robert J. Ferm

Chemistry and Chemical Biology ETDs

The first method used to prepare 2-imidazolines was through the reaction of aromatic aldehydes with ammonia. Amarin, which is known as 2,4,5-triphenyl-2-imidazoline, was the first compound reported to be prepared in this manner. This type of reaction has since been widely studied 2,3,4,5,6 in connection with the preparation of 2,4,5-triarylimidazolines. Furfural and ammonia have also been reported to react in a similar manner. Amarin has also been obtained from the reaction of a mixture of benzil, ammonia, and benzaldehyde.

The Preparation And Properties Of Aromatic Ditellurides, Roger Sanftner

Chemistry and Chemical Biology ETDs

It has been shown that tellurium tetrachloride combines additively with aliphatic others yielding hygroscopic compounds of the type R2O•TeCl4, but with mixed ethers, containing both alkyl and aryl radicals, substitution takes place with the elimination of hydrogen chloride.

The Chelation Of Praseodymium As A Function Of Ph Using Thenolytrifluoroacetone, Thomas K. Keenan

Chemistry and Chemical Biology ETDs

The rare earth elements, including elements 57 through 71, provide many diverse series of studies through their chemical reactions. In as much as these elements are all in Group III of the periodic table, they are markedly similar in their properties. The separation, insulation and purification of the various rare earths from one another has long been a problem of great interest to the chemist. All of these elements show a principle valence of plus three. Cerium has a well-defined plus four state, stable in aqueous solution and europium forms a stable, insoluable divalent sulfate. Those two exceptions, however, are …

A Study Of The Intermediary Products Formed During The Life Of A Copper Cyanide Plating Bath, Matthew E. Carlisle

Chemistry and Chemical Biology ETDs

Four aims of a study of cyanide baths were:

1. To study the intermediate products formed during the operation of plating and stripping baths under various conditions.

2. To identify these intermediate products or complexes and to determine whether or not they caused the failure of the bath.

3. To consider the conditions that caused a bath to fail, and to be able thereby to increase the life of the bath.

4. To develop a fast, accurate method for controlling the baths, preferably by means of the cyanide content.

The Use Of Ethyl 4,4-Dimethyl-1-Isopropyl-2-Imidazolinyl-2-Acetate In The Synthesis Of Some 2-Imidazolines, Jacob Shapira

Chemistry and Chemical Biology ETDs

The first recorded synthesis of a 2-imidazoline was reported in 1882 by Radziszewski who obtained what he thought to be 2,4,5-triphenyl-3-imidazoline by warming an alcoholic solution of benzoin, ammonia and benzaldehyde. ‘Amarine’, the common name for this compound, has been shown to be 2,4,5-triphenyl-2-imidazoline.

A Study Of Magnesium Silicate As A Base Matrix Material For Fluorescent Materials, John D. Hopperton

Chemistry and Chemical Biology ETDs

Luminescent materials have come into wide and important use within the past ten years in such equipments as the fluorescent lamp, and the cathode ray television tube. Because of this wide interest and usage, there has been made a concentrated search for ever brighter luminescent materials. It has also been of importance to produce and investigate materials which would produce as a wide range of colors under excitation as possible.

Synthesis Of Imidazolines, Diazepines, Triazepines And Imidazolidones From A 1, 2-Diamine And 1, 1-Dicarboxylic Esters, Irwin J. Pachter

Chemistry and Chemical Biology ETDs

In 1884 Freund (1) heated a mixture of malonic ester and ethylenediamine and obtained a product which dried to give a high melting powder. He named the compound ethylenemalonamide and attributed a seven-membered ring structure to it.

Synthesis Of 2-Phenyl-2,1,3-Triazole-4-Carboxaldehyde And Some Derivatives, Gene Sumrell

Chemistry and Chemical Biology ETDs

It was decided in this problem to prepare 2-phenyl-2,1,3-triazole-4-carboxaldehyde (III) as a starting material by the method suggested by Hann and Hudson and run a number of typical aldehyde reactions with it. The preparation of (III) involved: (1) The hydrolysis of sucrose to form glucose and fructose; (2) conversion of these two sugars to D-glucose phenylosazone (I), by reaction with phenylhydrazine; (3) transformation of (I) to D-glucose phenylosotraizole (II), by the action of hot aqueous copper sulfate; and (4) oxidation of the side chain from (II) with sodium periodate, forming (III).

The reactions selected were: (1) the Grignard reaction; (2) …

The Conversion Of Certain Amino Acids To Carbohydrate In Normal Animals, Bergere Alfred Kenney

Chemistry and Chemical Biology ETDs

Among the earliest problems which interested the physiological chemist was that of the possibility of an interconversion of the major types of food-stuffs. That this conversion actually does take place in the case of carbohydrates changing to fats has been apparent, ever since Man began to fatten his domestic animals on a starchy diet. However, interconversion of the other types, such as that of fats to carbohydrates and proteins, or carbohydrates to proteins, and of proteins to carbohydrates and fats, is not so obvious, and even now, after many years of experimen­tation, the answer to the question is far from …

Public Water Supplies Of New Mexico, Kenneth F. Priest

Chemistry and Chemical Biology ETDs

Distribution of population in State. The estimated population for the State of New Mexico for the year 1930 was 423,300. A close observation of the population centers shows them to be scattered over a wide range of territory. The largest city, Albuquerque, has approximately 26,000 citizens. The next sites, according to the 1930 count, are three in number, Santa Fe, Roswell, and Clovis. The remaining population including rural districts do not number over eight thousand people.

A Chemical And Biological Study Of The Waters Of Elephant Butte Reservoir As Related To Fish Culture, John Greenbank

Chemistry and Chemical Biology ETDs

The investigation of fresh-water lakes with respect to fish and other aquatic life had its beginning in Europe in the latter half of the nineteenth century. Probably the only man who may be considered to be the founder of the science of limnology was F. A. Forel, of the University of Lausanne Switzerland. Professor Forel’s work was the start of a rapidly developing branch of study, not only in Europe, but also presently in North America.