Chemistry Commons^™

Preparation Of Compounds Of Potential Physiological Activity: Amino And Thio Esters Of Substituted Benzilic And Glycolic Acids And Related Compounds, Dan Millard Glenn

Doctoral Dissertations

Interest in medicinal chemistry has been high during the last two decades all over the world, and particularly in the United States. It has been stimulated by improved methods of clinical diagnosis and the ensuing demands for new corrective and curative agents, by the need for better medicinals in the treatment of the growing number of aged individuals, by the urgency of wartime search for anti-infectious drugs, by the greater significance of pharmaceutical theories, and by the unpredicated expansion of the American pharmaceutical industry. The proof of the structure of most vitamins and of many internally secreted products and the …

An Investigation Of The Reduction Of Carbon-Carbon Unsaturation By Alkali Metals In Liquid Ammonia, Donald Richard Larkin

Doctoral Dissertations

Introduction: The properties of liquid ammonia are similar in many ways to those of water. Liquid ammonia has the very high specific heat of 1.10 calories per gram. Hydrogen bonding occurs to a considerable degree although not as extensively as in water. Evidence of hydrogen bonding as reflected in boiling points is shown in Table I. The dielectric constant is 22 at -33° which is also very high for a solvent which is comparatively inert to reactive metals. (Hexane has a dielectric constant of 1.87.) Liquid ammonia is a much better solvent for organic compounds than water. Even such large …

Preparation Of Compounds Of Potential Physiological Activity: Derivatives Of Benzilic, Substituted Acetic And Substituted Glycolic Acids And Substituted Butanones, Thomas Alexander Magee

Doctoral Dissertations

The continuing search of chemists, physiologists and medical researchers for natural and synthetic compounds which will alleviate or cure the illnesses of mankind constitutes a fascinating episode in the history of scientific endeavor. One chapter of this history is necessarily concerned with efforts to synthesize better, more useful antispasmodics. To present a comprehensive critical review of these efforts would require an extensive treatise and will not be attempted here. Several reviews are available which cover the literature to around 1950. The present survey will be a brief resume of the more pertinent material to the present time. It is hoped …

An Investigation Of Techniques For The Separation Of Hydrogen And Deuterium: Part I: Zone Refining Of Mixtures Of Ordinary And Heavy Water; Part Ii: The Reaction Of Iron With Mixtures Of Ordinary And Heavy Water; Part Iii: Gas Chromatography With Hydrogen And Deuterium Samples, Carl Owens Thomas

Doctoral Dissertations

The separation factor for a single fractional crystallization in the H₂O-D₂O system is much too small, and the required freezing rate is too slow for a batch process to give a useful separation of the isotopic forms of water. The purpose of this work was to continue some preliminary experiments on zone refining in the H₂O-D₂O system and to attempt to determine whether or not the technique would be useful for the separation of heavy water from ordinary water.

Some Properties Of Surface Films Formed By Adsorption Of N-Nonadecanoic Acid On Mechanically Activated Metal Surfaces, Tomlinson Fort Jr.

Doctoral Dissertations

The Problem: The work reported here is concerned with the adsorption of n-nonadecanoic acid onto freshly machined metal surfaces. The work done is a direct continuation of that begun by Smith and Allen and continued by McGill whose experimental techniques have largely been adopted. The investigation involves the adsorption of a typical polar organic molecule onto "clean" metal surfaces, prepared under rather rigidly controlled and unique conditions in a system from which the usual surface contaminants are believed to be absent. The purpose of these studies is to gain some insight into the properties of metal surfaces themselves, the …

A Calorimetric Investigation Of Zirconium, Titanium, And Zirconium Alloys From 60 To 960°C, James L. Scott

Masters Theses

Structural materials for nuclear reactors must meet three stringent conditions: they must have adequate mechanical properties at the operating temperature, they must be corrosion resistant to the heat transfer medium (air, water, or alkali metals), and they must not absorb neutrons excessively. This last requirement is a particularly stringent one, for it is met by only four accessible metals: aluminum, magnesium, beryllium, and zirconium, as Table I shows.

For reactors which operate at low temperatures, aluminum serves as an excellent constructional material, but it cannot be used for more efficient high-temperature reactors, because of its low elevated temperature strength associated …