Thesis (M.S.)--Texas State University-San Marcos, 2007. / Vita. Includes bibliographical references (leaves 73-75).

Thesis (M.S.)--Texas State University-San Marcos, 2007. / Vita. Includes bibliographical references (leaves 73-75).

Thesis (Ph.D.)--University of Nebraska-Lincoln, 2008. / Title from title screen (site viewed July 22, 2008). PDF text: v, 167 p. : ill. (some col.) ; 5 Mb. UMI publication number: AAT 3291922. Includes bibliographical references. Also available in microfilm and microfiche formats.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1967. / Typescript. Vita. Description based on print version record. Includes bibliographical references.

One hundred and seventy four shale and argillaceous carbonate samples have been analyzed spectrographically for boron. The samples represent argillaceous sediments varying in age from the Proterozoic to the Cretaceous. A negative correlation between per cent CO2 and boron suggests that boron is mainly distributed in the argillaceous fraction and in the silica fraction. The B 2497.73A° line, because of an Fe coincidence at 2497.82A°, was found to be unsuitable for boron determinations in either the first or second orders of a Jarrel-Ash Wadsworth-mount spectrograph (Dispersion 5.2 and 2.6 A/Mm. respectively). Consequently, an analytical method utilizing B 2496.78a° in the second order spectrum was used. The boron results of this method compared to a chemical method appear to be systematically lower at concentrations above 24 ppm. boron. For example, two samples analyzed chemically contained 24 and 117 ppm. boron whereas the same samples analyzed spectrographically contained 24 and 79 ppm. boron. Absolute boron values probably could be recalculated by adjusting the working curve. Shales containing an apparent boron content above 75 ppm. appear to indicate a marine or hypersaline depositional environment. One section, Whitehorse F. (Triassic) has been misclassified into brackish or fresh water depositional environment based on low (below 75 ppm.) boron content. However, the mineralogy of this section is atypical (very high carbonate content) and the results may be misleading. Samples from the Fernie, Banff, Mount Hawk, Thorold and Grimsby, and the sub-Devonian all contain more thin 75 ppm. thus indicating marine depositional environments. A brackish water environment is suggested for shales from the Littleton and Kaakapau (Blackstone) Formations. One shale section, the Proterozoic (Miette Group), may have been deposited under a fresh water environment. / Thesis / Master of Science (MSc)

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The generation and isolation of two novel borenium cations has been described. The observation that the reaction of the Lewis acid B(C6F5)3 and the Lewis base diazabicyclo[2.2.2]octane (DABCO) with pinacol borane (HBpin) resulted in the activation of the B–H bond of HBpin and formation of a stable borenium cation/borohydride salt. This stable salt was used as a catalyst in the hydroboration reaction. It was shown to catalytically reduce a wide array of substrates including imines, N-heterocycles, nitriles, and ketones using pinacol borane as the source of hydride. Another borenium ion, synthesized from trityl tetrakis-pentafluorophenyl borate, DABCO, and HBpin did not contain a nucleophilic borohydride counterion and it was isolated in the solid state. This salt was also found to reduce the same substrates with similar yields and reaction times. The mechanisms of both of these catalysts were investigated and were found to be proceeding by a similar borenium catalyzed process. Quantitative analysis of the initial rates of each catalyst under identical conditions yielded rate constants on the same order of magnitude which strongly suggested that both catalysts operated via similar mechanisms. Stoichiometric experiments and isotope labelling using deuterated pinacol borane demonstrated that the nucleophilic counterion was not a kinetically relevant reducing agent under the reaction conditions. Furthermore, these reactions and the use of an isolable iminium ion as a hydride acceptor indicated that the hydride delivery agent was a DABCO•HBpin adduct. The DABCO•HBpin adduct was observed spectroscopically at ambient and subzero temperatures. Lastly, the rate of reduction using pinacol borane and [d1]-pinacol borane were significantly different and produced a high kinetic isotope effect (KIE = kH/kD = 6.6 ± 0.2). This high KIE strongly indicates that hydride delivery is the rate limiting step in the catalytic cycle. With this knowledge an asymmetric model is discussed and the beginnings of the development of an asymmetric borenium cation catalyzed process are described. / Thesis (Master, Chemistry) -- Queen's University, 2012-10-13 08:48:37.506

Thesis advisor: Shih-Yuan Liu / Described herein are two distinct research projects focused on the development of metal-catalyzed late-stage functionalization strategies for 1,2-dihydro-1,2-azaborines separated into three chapters. The first chapter discusses the development, synthesis, and recent contributions to the field of azaborine chemistry. The second chapter details the development of rhodium catalyzed B-H bond activation for the synthesis of a new class of BN-stilbenes as well as the discovery of a novel B-H to B-Cl transformation that is successful both with B-H azaborines as well as other B-H containing compounds. The third chapter pertains to the development of a B-H and B-Cl tolerant C(3) functionalization strategy through the use of Negishi cross-coupling. Using this methodology, previously unreported isomers of BN-naphthalene and BN-indenyl have been synthesized and characterized. / Thesis (PhD) — Boston College, 2015. / Submitted to: Boston College. Graduate School of Arts and Sciences. / Discipline: Chemistry.