NDLTD logo NDLTD Union Catalog and Global ETD Search

Global ETD Search

Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.

Results

Showing 1 to 20 of 57 for “"racemization"”.

  1. Racemization of amino acids in agricultural soils

    Griffin, Charles VincentAdelaide Thesis (Ph.D.) -- University of Adelaide1990

    adelaide Repository record

  2. Racemization and asymmetric transformation of α-substituted carboxylic acids

    Ebbers, Evert Jan[S.l. : s.n.]2006

    Contains fulltext : mmubn000001_238752046.pdf (Publisher’s version ) (Open Access)

    radboud Repository record

  3. Racemization of Amino Acids in Teeth for the Determination of Age

    Toll, Andrea Lee

    … has focused on relating the extent of amino acid racemization in teeth to age. Past research has focused primarily on the analysis of aspartic acid due to its high racemization rate. Our research indicates that glutamic acid also shows promise as related to age determination. Results will be …

    wku-diss Repository record

  4. A modified synthesis, C-functionalization, resolution and racemization kinetics of cross -bridged tetraazamacrocycles

    Odendaal, Antoinette Yolanda

    … acid is described. Additionally, the kinetics of racemization of enantiopure cross-bridged cyclam is presented.</p>

    unh-thes Repository record

  5. Reactions of Coordination Compounds in the Solid State: The Racemization of (positive)-Tris(ethylenediamine)-Cobalt(iii)-Halide-(hydrate) Complexes

    Kutal, Charles RonaldUniversity of Illinois at Urbana-Champaign2014

    Made available in DSpace on 2014-12-10T23:01:04Z (GMT). No. of bitstreams: 1 7114838.pdf: 4402669 bytes, checksum: 64141deb7b7f1eab78e07d0672cbaa59 (MD5) Previous issue date: 1970

    uiuc Repository record

  6. I. The Rearrangement of Aryl Methylallyl Ethers II. Effect of Substituents on the Rate of Racemization of Optically Active Diphenyls

    Bartz, Quentin RoyalUniversity of Illinois at Urbana-Champaign1935

    uiuc Repository record

  7. I. Relative Rates of Racemization of Substituted Diamides of 2, 2'-Dimethoxy-6, 6'-Dicarboxydiphenyl II. Cyclic Derivatives of 9,10-Phenanthrenequinone

    Hsing, Chi YiUniversity of Illinois at Urbana-Champaign1936

    uiuc Repository record

  8. The Solid Phase Isomerization of Trans-Dichlorotetramine Cobalt(iii) Iudate Dihydrate and Racemization of 1-Cis-Dichloro Bis(ethylenediamine) Chromium(iii) chloride.hydrate

    Lemay, Harold Eugene, Jr.University of Illinois at Urbana-Champaign2014

    Made available in DSpace on 2014-12-09T17:35:40Z (GMT). No. of bitstreams: 1 6706657.pdf: 6790185 bytes, checksum: 21b80dd0374691859f76d9293ef66373 (MD5) Previous issue date: 1966

    uiuc Repository record

  9. Development of a Lewis Base Catalyzed Selenocyclization Reaction

    Collins, WilliamUniversity of Illinois at Urbana-Champaign2015

    … particular, rapid deselenylation and subsequent racemization of the seleniranium ion has been shown to occur in the presence of alcohol and olefin nucleophiles. Investigations into retarding the rate of racemization of the seleniranium ion intermediate have revealed that electron-poor and …

    uiuc Repository record

  10. I. Effect of temperature and solvents on the rate of racemization of 2-nitro-6-carboxy-2'-alkoxydiphenyl. II. Preparation and resolution of 2,2'-dimethoxy-5,5'-dicarboxy-6,6'-dimethyldiphenyl

    Li, Ching ChenUniversity of Illinois Urbana-Champaign1934

    uiuc Repository record

  11. I. Effect of Substituents on the Rate of Racemization of Optically Active Diphenyls: Preparation and Resolution of Five 4-Substituted-2-Methoxy-2'-Nitro-6'-Carboxydiphenyls II. The Constitution of Vasicine

    Hanford, William EdwardUniversity of Illinois at Urbana-Champaign1935

    uiuc Repository record

  12. Dynamics and Catalytic Resolution of Selected Chiral Organolithiums

    Beng, Timothy Kum2017

    … were selected. The barriers to racemization and dynamic thermodynamic resolution (DTR) of these compounds were measured in the presence of various diamine ligands. Using the thermodynamic parameters to guide us, the catalytic dynamic resolution (CDR) was then investigated on both …

    arkansas Repository record

  13. Metal complexes as models for vitamin B₆ catalysis

    Weinstein, Georgia Nan.Massachusetts Institute of Technology1972

    … This result shows that facile exchange and racemization properties of Bis[N-(alkoxycarbonylalkyl)salicylaldimino] metal(II) complexes derive principally from the direct attachment of the electron-withdrawing HC=NM and COOC₂H₅ groups to the asymmetric center. The base-catalyzed racemization …

    mit Repository record

  14. Stereochemistry of small molecules: Configurational and conformational control

    Zhang, YiqunVirginia Tech2007

    … we addressed the effect of chelating groups on racemization via the "conducted tour" mechanism. We then explored metal-bromine exchange on enantiopure bromonitrile as alternative route to metalated nitriles. In this way, we demonstrated that magnesiated 2,2-diphenyl cyclopropylnitrile is …

    vt Repository record

  15. Methylmalonyl -Coa Decarboxylase (Ygfg) for Escherichia Coli: A New Activity for the Crotonase Superfamily

    Haller, ToomasUniversity of Illinois at Urbana-Champaign2015

    … the MMDC reaction with at least partial racemization. I postulated that His66 is important in retaining structure of the active site.

    uiuc Repository record

  16. Studies on Resolution of Enantiomeric Dialkylaryl Sulfonium Ions with NMR Shift Reagents

    Son, Ea-Ji-Ru

    … the shift reagent and by analyzing R-enriched I. Racemization of R-enriched isomer of I by pyramidal inversion was observed at 50 °C.</p>

    wku-diss Repository record

  17. I. Effect of substituents on the rate of racemization of optically active diphenyls: Preparation and resolution of five substituted 2-nitro-6-carboxy-2'-methoxydiphenyls. II. Stereoisomerism of orthomonosubstituted diphenyls: Preparation and properties of 2-chloromercuri-3'-carboxydiphenyl

    Chien, Shih LiangUniversity of Illinois Urbana-Champaign1934

    uiuc Repository record

  18. Asymmetric nucleophilic catalysis with planar-chiral DMAP derivatives and chiral phosphines : synthetic and mechanistic studies

    Lee, Sarah YunmiMassachusetts Institute of Technology2014

    … combination with a ruthenium complex (an alcohol-racemization catalyst). Chapter 2 describes the development and detailed mechanistic investigation of the enantioselective synthesis of tertiary alkyl fluorides via the [alpha]-fluorination of ketenes catalyzed by a planar-chiral nucleophile with …

    mit Repository record

  19. Development and application of palladium-catalyzed carbon-nitrogen bond forming reactions

    Wagaw, Seble-Hiwot Teshome, 1971-Massachusetts Institute of Technology1999

    … substrates are utilized, as well as preventing racemization of chiral substrates. A mechanism for the observed racemization with the Pd/P( o-tolyl)3 catalyst is proposed. A discussion on the difference in reactivity between Pd/P( o-tolyl)3 and Pd/bis(phosphine) catalysts is presented. The …

    mit Repository record

  20. Trichloroacetimidates as Alkylating Reagents in C-N Bond Formation and Synthesis of Aminosteroid and Quinoline Inhibitors of Src Homology 2 Domain-Containing Inositol Phosphatase (SHIP)

    Wallach, Daniel Ryan

    … <p>imidate by 4-chloroaniline led to significant racemization which indicates that the reaction may proceed through a carbocation intermediate.</p> <p>The alkylation of sulfonamides with trichloroacetimidates under thermal conditions is also described. Primary and secondary trichloroacetimidates …

    syracuse-diss Repository record

Page 1 of 3