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  • Chain extension of boronic esters with stereo- and regio-defined lithiated oxiranes

    Creator:
    Alwedi, Embarek
    Abstract:
    The stereospecific reagent-controlled homologation (StReCH) of boronic esters with putative lithiooxiranes generated in situ from appropriate precursors via sulfoxide-lithium exchange, tin-lithium exchange, and direct lithiation is described with an emphasis on the first lithiation technique which allows for the regio- and stereo-specific generation of all types of lithiooxirane isomer. Transient...
    Resource Type:
    Dissertation

  • Development of Methods for Stereoselective Carbon-Carbon Bond Formation

    Creator:
    Wu, Zhenhua
    Abstract:
    Three distinct methods to achieve the stereoselective synthesis of carbon-carbon bonds were investigated, encompassing: (i) the formation of axially chiral biaryl molecules by enantioselective Suzuki cross-coupling, (ii) the synthesis of α-phenylalkylboronic esters by enantioselective chain extension, and (iii) the stereospecific synthesis of alkenes by eliminative cross-coupling of enantioenriched sp³-hybridized carbenoids....
    Resource Type:
    Dissertation
    Full Text:
    Barsamian, Embarek Alwedi, Xun Sun, Kyoungyim Lee, Somdev Banerjee, Amanda Hoyt, Yang Cao and Kristin

  • Ecosystem Processes in Treated and Untreated Western Juniper Systems in Semiarid Watersheds: A Paired Watershed Study in Central Oregon

    Creator:
    Abdallah, Mohamed AB.
    Abstract:
    Western juniper (Juniperus occidentalis) encroachment has been associated with negative ecological and hydrological consequences including reductions in herbaceous production and diversity, deterioration for wildlife habitat, and higher erosion and runoff potentials. As a result, western juniper removal is a common and accepted rangeland management practice. Although studies evaluating the ecological...
    Resource Type:
    Dissertation
    Full Text:
    , Embarek Alwedi, Riad Khalf, Mustafa Aljadi, Abdelkader Jermy, Yousef Elmahdi, Khaled Abulgasem