Thesis (Ph. D.)--University of Michigan, 1938. / "Reprinted from the Physical review, vol. 54, no. 1, July 1, 1938."

L. Gordon's Thesis--University of Michigan. / Two articles, by H.H. Willard and L. Gordon, reprinted from Analytical chemistry, vo. 20, p. 165, Feb. 1948 and v. 25, p. 170, Jan. 1953. Includes bibliographical references.

Thesis (Ph. D.)--University of Michigan, 1938. / "Reprinted from the Physical review, vol. 54, no. 1, July 1, 1938."

Thesis (PH. D.)--Princeton University, 1916. / Reprinted from Journal of industrial end engineering chemistry, v. 9, no. 2, February, 1917, p. 144-148.

Thesis ... of the University of Pennsylvania ... by Luther Ferree Witmer.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1969. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.S.)--University of Missouri, School of Mines and Metallurgy, 1948. / Vita. The entire thesis text is included in file. Typescript. Title from title screen of thesis/dissertation PDF file (viewed June 30, 2010) Includes bibliographical references (p. 39).

Quantification of tin isotopes in environmental samples, particularly the radioactive 126Sn, is important for processes such as the biomonitoring of organotin species, long-term nuclear waste storage and treatment planning. The detection of 126Sn by mass spectrometric methods is, however, hampered by the presence of the stable 126Te isotope. Therefore, separation of tin from tellurium is crucial to minimize isobaric interferences that limit the quantification of 126Sn by Accelerator Mass Spectrometry (AMS) and other instrumental techniques. In the present study, three major accomplishments are discussed: i) development of an analytical strategy to separate tin from tellurium, ii) monitoring of anionic interferences in the separation of tin from tellurium, and iii) suppression of 126Te background to allow the detection of 126Sn by AMS.

The work described in the dissertation is concerned mainly with organo-tin chemistry. In the first part, I describe the investigation of the stereochemistry of intramolecular electrophilic attack on a tin-carbon bond. The react ion of a number of cS - and � -s tanny 1 a lcoho 1 s and 0-stannyl acid chlorides was investigated, but stereochemical information was obtained only with the reaction of a 0-stannyl aldehyde to give a cyclopentanol, which proceeded largely with retention of configuration at the tin-bearing carbon, unlike the reaction of cS -stannyl alcohols, which give cyclopropanes with inversion. The second piece of work is a regio- and stereo-specific synthesis of allyl stannanes. s-stannyl ester enolates were treated with aldehydes to give alcol products with fairly good stereoselectivity: (~) and (~) enolates gave major products with different aldol relative stereochemistry. These aldols could be converted to s - hydroxy acids, then treatment with d imethy 1 formamide dimethyl acetal gave allyl stannanes stereospecifically, where steric and reactivity effects allowed. Thirdly, an investigation of the reaction of a tin cuprate with allenes is described. The cuprate reacts with 1,1-dimethyl allene followed by aqueous work up to give an allyl stannane, or the intermediate copper species can be quenched with a number of different ele,ctrophiles to give further substituted allyl stannanes. Similarly, allene itself reacts to give either vinyl or allyl stannanes, depending on the conditions used. Unfortunately, the factors governing the regiochemistry of the reaction with allene are not yet fully understood, and mixtu r es of products often result. Finally, I describe efforts to perform a kinetic resolution of a racemic Grignard reagent in which the chiral centre is the meta 1-bear ing carbon. It was hoped that react ion of the Gr ignard with half an equivalent of an optically active carbonyl compound would leave the remaining Gr ignard partially reso 1 ved. However, this did not prove to be successful.

The effects of a polycrystalline surface layer on the critical resolved shear stress, yield stress and the work hardening rate of tin single crystals has been investigated. The change in these parameters was found to be independent of the thickness of the layer. The results have been interpreted in terms of the inhibition of surface sources and the higher stress level required to initiate interior sources. An exploratory investigation of the flow mechanism in tin was undertaken. Tin single crystals oriented for slip on the (110) [001] slip system were deformed in the temperature range from room temperature to -80°C, with the lower limit of temperature being sensitively dependent on the strain-rate. Twinning was observed to be the mode of deformation below this lower limit. Strain-rate change tests at temperatures from -27°C to R.T. were performed in order to assess the activation energy and activation volume. On the basis of these values, the flow mechanism was postulated to be the non-conservative motion of jogs in screw dislocations. / Applied Science, Faculty of / Materials Engineering, Department of / Graduate