Chemistry Commons^™

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

This research was undertaken to study the pyrolysis of toluene in the vapor phase.

Many pyrolytic reactions of toluene have been studied by others, but the difficulty of controlling the reactions and the complexity of the products have not allowed much successful application of the results. The present work was an endeavor to better understand the reaction mechanisms and the intermediates involved in pyrolysis.

Specifically, the problem was to study the discrepancies between the results reported by M. Szwarc and by Hein and Mesee.

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 …

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 degrees C to 42.1 degrees C, and …

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

Chemistry and Chemical Biology ETDs

The realm of this study embraces observation of the exchange of iodine and potassium iodide in absolute methanol, absolute ethanol and absolute n-propanol at temperatures of 30.9 °, 20.3 ° and 0.0 ° centigrade. The primary aims were to observe the effects of the p-nitro group upon the exchange rates in effects of the p-nitro group upon the exchange rates in the various solvents and to compare the results with those obtained for the benzyl iodide-iodide exchange.