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Concomitant Polymorphism In 1,2-Bis(9-Anthryl)Acetylene, Rebecca Goldstein
Concomitant Polymorphism In 1,2-Bis(9-Anthryl)Acetylene, Rebecca Goldstein
Honors Theses
This thesis details the serendipitous discovery of the phenomenon of concomitant conformational polymorphism found to exist in 1,2-bis(9-anthryl)acerylene. 1,2-bis(9anthryl)acetylene is a previously published molecule. However, the published crystal structure showed the molecule to be completely planar, and to crystallize in the form of orange needles. While this form of the crystal was indeed found during the synthesis of 1,2-bis(9anthryl)acetylene, a new polymorph, crystallizing as yellow prisms, was also discovered. This yellow polymorph was found by X-ray crystallography to be monoclinic with an angle of 66.7 between the anthracene planes. The planar polymorph 1,2-bis(9-anthryl)acetylene was also found by X-ray crystallography to …
Detailed Mechanistic And Optimization Of The Photochemical Production Method Of Superoxide, Ta-Chung Ong
Detailed Mechanistic And Optimization Of The Photochemical Production Method Of Superoxide, Ta-Chung Ong
Honors Theses
The highly reactive nature of superoxide anion presents an analytical challenge to prepare stable standards for instrument calibration. McDowell et al. (1983) developed a convenient method of superoxide production based on continuous photolysis of benzophenone and acetone in oxygen saturated, alkaline, 2-propanol solution. In the McDowell reaction, ketones are photolyzed to their triplet state, and then reacted with alcohol to produce ketyl radicals that react with oxygen to produce superoxide. This study investigated the mechanism and rate of these reactions by Laser Flash Photolysis (LFP). Reaction rate constants for the reaction between the benzophenone triplet and ethanol was 5.5 x …
Intramolecular Chemistry Of Ss-Acetoxyethylidene And Photochemical Generation Of Vinylidenes, Jennifer M. Nguyen
Intramolecular Chemistry Of Ss-Acetoxyethylidene And Photochemical Generation Of Vinylidenes, Jennifer M. Nguyen
Honors Theses
The parent carbene ß-acetoxyethylidene has been previously generated by the photolysis of its precursor, acetic acid 1a,9b-dihydro-1H-cyclopropa[l]phenanthren-1-yl methyl ester. Mechanistic studies on ß-acetoxyethylidene have indicated the possibilities of three rearrangement pathways to the formation of vinyl acetate: a proton shift, an acyl shift, and a cyclic rearrangement (see Figure 8). A deuterium labeling study involving the replacement of the hydrogens on the methylene carbon has indicated that the simple 1,2-H shift was the primary manner of rearrangement, with an 82% yield of product. However, a primary kinetic isotope effect may have occurred due to the greater strength of a C-D …
World Bank -Cpa Conflict: The Struggle To Define Human Rights And Development In The Philippines, Adam B. Robbins
World Bank -Cpa Conflict: The Struggle To Define Human Rights And Development In The Philippines, Adam B. Robbins
Honors Theses
This thesis analyzes the interactions between the World Bank (hereafter, the Bank) and the Cordillera Peoples Alliance (CPA), an indigenous and environmental advocacy group based in the Cordillera region of Luzon, in the Philippines. Using data gathered through both text-based and participatory research methods, I analyze the discursive relationship and violent confrontations between the two organizations. Conflicting development and human rights values cause the majority of these conflicts. I focus on how each organization enacts development and human rights, and how this leads to conflict. Ultimately, I intend for this thesis to offer practical guidance for the reader involved in …