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Filtering by: Alternative title ssim Fishery research report no. 5 Remove constraint Alternative title ssim: Fishery research report no. 5 Decade 2000-2009 Remove constraint Decade: 2000-2009 Degree Field Chemistry Remove constraint Degree Field: Chemistry

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  • Intercalation, exfoliation, and nanocomposites of layered inorganic compounds

    Creator:
    Sukpirom, Nipaka
    Abstract:
    The melt intercalation of poly(ethylene oxide) (PEO) between layers of MoO₃ and MPS3 (M=Mn,Cd) is obtained by heating the ground mixture and LiₓMoO₃, KₓMn₁-ₓ/₂PS₃, or KCd₁-ₓ/₂PS₃. The products are characterized by powder X-ray diffraction (XRD). Below the melting temperature of PEO (66 °C), intercalation rates and yields are low. By...
    Resource Type:
    Dissertation
    Full Text:
    reaction, there is no report on the incorporation of very large guests such as polymers into layered or

  • Synthesis, characterization, and reactivity of rhenium dithiodiolate and monothiodiolate complexes

    Creator:
    Chuawong, Pitak
    Abstract:
    The rhenium dithiodiolate, Hydrido-tris-(3 ,5-dimethyl- 1 -pyrazol yl) borato(ethane- 1 ,2-dithiodiolato)(oxo)rheni um(V), and Hydrido-tris-(3 ,5-dimethyl- 1 -pyrazolyl)borato(phenylethanedithiodiolato)(oxo)rhenium(V), were synthesized by reductive cyclocondensation of alkane-1,2-dithiols with Tp'Re0₃ in a one pot fashion. The rhemium monothiodiolate, Hydrido-tris-(3 ,5-dimethyl- 1 -pyrazolyl) borato(ethane- 1 ,2-monothiodiolato)(oxo)rhenium(V), and Hydrido-tris-(3 ,5- dimethyl- 1 -pyrazolyl)borato(propanemonothiodiolato)(oxo)rhenium(V), were also synthesized...
    Resource Type:
    Masters Thesis
    Full Text:
    rhenium dithiodiolate, Hydrido-tris-(3 ,5-dimethyl- 1 -pyrazol yl) borato(ethane- 1 ,2-dithiodiolato)(oxo

  • Development of organocatalyzed, intramolecular heteroatom Michael addition and application towards alkaloid synthesis

    Creator:
    Carlson, Erik
    Abstract:
    Effective methods for the enantiopure formation of substituted piperidine rings are significantly important due to their presence in alkaloid products. A valuable method to form these ring systems would be via an intramolecular heteroatom Michael addition from the corresponding enone or enal. Described herein is a methodolgy that has been...
    Resource Type:
    Masters Thesis
    Full Text:
    . Homopipecolic acid was synthesized in 7 steps and 28% yield from commercially available 1-bromo-5-hexene

  • Catalytic desymmetrization of D₂d̳-symmertic proprochiral tetrasubstituted biphenyl compounds: a novel approach to the synthesis of axially chiral C₂-symmetric molecules

    Creator:
    Gunderson, Jeremey Tyson
    Abstract:
    Many D2d-symmetric 2,2',6,6'-tetrasubstituted biphenyls are readily prepared via net oxidative dimerization of appropriate 1,3-disubstituted benzenes. Conversion of such proprochiral compounds to useful C2-symmetric chiral biphenyls requires formal replacement of two substituents on opposing aryl ring units with alternate groups. This under exploited desymmetrization tactic has been demonstrated for the generation...
    Resource Type:
    Masters Thesis
    Full Text:
    of two groups X by two groups Y. The initial "substitution" event, 2 to 5, presents no issue of

  • Polarization spectroscopy and photodissociation studies of nitroaromatic compounds in the gas phase

    Creator:
    Abbott, James E.
    Abstract:
    The central purpose of this dissertation was to explore and expand the use of an uniform electric field for orientation and for subsequent spectroscopic investigation of asymmetric polar molecules in the gas phase. The systems of study were nitrobenzene (NB) and the nitrotoluene (NT) isomers. We were able to quantitatively...
    Resource Type:
    Dissertation
    Full Text:
    dissociation process by analyzing the internal energy distribution of the Nitric Oxide (NO) photofragment

  • Electronic spectroscopy of biological relevant species and their complexes with solvent molecules

    Creator:
    He, Yonggang
    Abstract:
    In this dissertation, I present electronic spectroscopy of a few biologically relevant species and their complexes with solvent molecules in the gas phase using a variety of techniques, including resonantly enhanced multiphoton ionization (REMPI), laser induced fluorescence (LIF), and zero kinetic energy (ZEKE) photoelectron spectroscopy. My work on several methylated...
    Resource Type:
    Dissertation
    Full Text:
    from the gas phase to the solution phase, I also report studies of supersonically cooled water

  • Synthesis of novel ambifunctional atropisomeric 2,2',6,6'-tetrasubstituted biphenyls and investigation of their properties and organocatalytic activity

    Creator:
    Sephton, Mark Alan
    Abstract:
    Ambifunctional axially chiral 2,2',6,6'-tetrasubstituted biphenyls containing nucleophilic (or basic) functional groups juxtaposed with hydrogen-bond donors were synthesized and their properties studied. Applications for the prepared biaryls as potential organocatalysts for enantioselective carbon-carbon bond forming reactions were examined. Processes investigated included: aldol, Michael, nitroaldol (Henry), and Baylis-Hillman reactions. The novel amidoamine...
    Resource Type:
    Dissertation
    Full Text:
    % loading), but with barely discernable enantioselectivity (2-5%ee). Successful organocatalysis by the

  • Total synthesis of (-)-7-epicylindrospermopsin

    Creator:
    Hansen, Joshua D.
    Abstract:
    The first asymmetric synthesis of (-)-7-epicylindrospermopsin via intramolecular nitrone cycloaddition is described. The synthesis utilized a convergent approach to prepare the cycloaddition precursor 176, which was assembled by condensation of hydroxylamine 175 with aldehyde 145. Hydroxylamine 175 was synthesized from ethylene glycol (166) in seven steps. Aldehyde 145 was completed...
    Resource Type:
    Dissertation
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    oxazabicyclo[2.2.1 ]heptane derivative 177 accompanied by two unidentified stereoisomers in a ratio of 10:5

  • Direct atom transfer vs. ring expansion in reaction of rhenium oxo complexes with cyclooctene epoxides and episulfides

    Creator:
    Khownium, Kriangsak
    Abstract:
    The rhenium (V) complex Tp'ReO₂ (Tp' = hydrido-tris-(3,5- dimethylpyrazolyl)borate), generated in situ from PPh₃ reduction of Tp'Re0₃, reacts with small ring heterocycles such as epoxides and episulf ides. The strained trans-cyclooctene ring provides an unusual thermodynamic bias against direct atom transfer, but trans-cyclooctene oxide still produces substantial amounts of trans-cyclooctene....
    Resource Type:
    Masters Thesis
    Full Text:
    Literature Review and Research Goals A number of 0- and 5- atom transfer catalysts were developed for

  • Mass spectrometric analysis of UV-crosslinked protein-nucleic acid complexes

    Creator:
    Doneanu, Catalin E.
    Abstract:
    The DNA-binding domains of E. coli uracil-DNA glycosylase (Ung) and human replication protein A (hRPA) were studied using a general protocol developed in our laboratory for probing protein-DNA interactions. The procedure involves purification and mass spectrometric analysis of the nucleopeptide-products of a tryptically digested UV-crosslinked protein-nucleic acid complex. In the...
    Resource Type:
    Dissertation
    Full Text:
    identity of these peptides as T43, T28129, and a truncated *T24/25 (without the last 5 aminoacids from the