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Dissertation.

Thesis (Ph. D.)--University of Chicago.

Dissertation.

Thesis (Ph. D.)--University of Chicago.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1907. / Typescript. With this is bound 6 journal articles: Derivatives of phenyl ether I-V and Phenyl ether and some of its derivatives. Reprinted from the American chemical journal, vol. XXIV, no. 6 (Dec. 1900), p. [525]-529 ; vol. XXVIII, no. 6 (Dec. 1902), p. [486]-490 ; and Journal of the American Chemical Society, vol. XXIII, no. 11 (Nov. 1901), p. [806]-813 ; vol. XXIV, no. 12 (Dec. 1902), p. [1200]-1204 ; vol. XXV, no. 1 (Jan. 1903), p. [60]-68 ; vol. XXXII, no. 10 (Oct. 1910), p. [1285]-1294. Includes bibliography (leaves 64-67) and "Index of new compounds" (leaves 68-69).

Thesis (MTech (Chemistry))--Cape Peninsula University of Technology, 2007 / The inclusion behaviour of the two host compounds, 9-(4-methoxyphenyl)-9Hxanthen- 9-o1 (A1)• and 9-(4-methylphenyl)-9H-xanthen-9-o1 (A10) were investigated. These host compounds are large, bulky, rigid and they contain functionalities that allow them to selectively interact with other molecules, such as the guests in this work. The host molecules form inclusion complexes with small organic guest molecules. The host•••guest interactions are the interesting focus of this study. The host A1 included the guests: cyclohexane, 1,4-dioxane and N,N-dimethylformamide. Kinetics of desolvation were studied for the 1,4-dioxane and N,N-dimethylformamide compounds. Guest-exchange reactions were performed. The hostA1 was also used in the separation of 1, 4-dioxane and benzene. The host A10 included the guests; benzene, 1,4-dioxane, cyclohexane, cyclohexanone, N,N-dimethylacetamide and N,N-dimethylformamide. Kinetics of desolvation were studied for the benzene and cyclohexane compounds. The host A10 was used in the separation of the following pairs of guests: benzene and 1,4-dioxane; N,N-dimethylformamide and N,Ndimethylacetamide. The structures of the compounds were elucidated using single crystal X-ray diffraction. Thermal analysis was performed in order to determine the thermal stabilities of the complexes, including techniques such as thermogravimetry, differential scanning calorimetry and melting point measurement. The reactions in the guest exchange experiments were monitored using differential scanning calorimetry. Competition experiments were performed to determine the selectivity of a host for a series of related guests. These experiments were conducted between pairs of guests.

The pseudo-first-order reaction kinetics of the reaction of phenyl isocyanate with water in 80 percent acetone and 20 percent water were studied using carbon dioxide evolution as a function of time as the reaction rate measurement. The activation parameters were determined from studies of the reaction rate at several different temperatures. Additionally, some catalytic and deuterium isotope effects were determined. From the results of these studies, a detailed mechanism of the reaction was proposed. The first step of the mechanism involves the formation of a cyclic intermediate and is the rate determining step.

Graduate / 0485

Graduate / 0485