Index Catalog // ScholarsArchive@OSU

Creator:: Oliveri, Anna F., Wills, Lindsay A., Hazlett, Caitlyn R., Carnes, Matthew E., Chang, I-Ya, Cheong, Paul Ha-Yeon, and Johnson, Darren W.
Abstract:: NMR spectroscopy is the go-to technique for determining the solution structures of organic, organometallic, and even macromolecular species. However, structure determination of nanoscale aqueous inorganic clusters by NMR spectroscopy remains an unexplored territory. The few hydroxobridged inorganic species well characterized by ¹H Nuclear Magnetic Resonance spectroscopy (¹H-NMR) do not provide...
Resource Type:: Article

Creator:: Gould, Eoin, Walden, Daniel M., Kasten, Kevin, Johnston, Ryne C., Wu, Jiufeng, Slawin, Alexandra M., Mustard, Thomas J. L., Johnston, Brittany, Davies, Tony, Cheong, Paul Ha-Yeon, and Smith, Andrew D.
Abstract:: The regiodivergent O- to C- or N-carboxyl transfer of pyrazolyl carbonates is described, with DMAP giving preferential N-carboxylation and triazolinylidenes promoting selective C-carboxylation (both with up to >99 : 1 regioselectivity). An enantioselective O- to C-carboxyl variant using NHC catalysis is demonstrated (up to 92% ee), while mechanistic and DFT studies outline...
Resource Type:: Article
Full Text:: 10.1039/C4SC00879K Royal Society of Chemistry Version of Record http://cdss.library.oregonstate.edu/sa

Creator:: Johnston, Ryne C., Cohen, Daniel T., Eichman, Chad C., Scheidt, Karl A., and Cheong, Paul Ha-Yeon
Abstract:: This study describes the combined experimental and computational elucidation of the mechanism and origins of stereoselectivities in the NHC-catalyzed dynamic kinetic resolution (DKR) of α-substituted-β-ketoesters. Density functional theory computations reveal that the NHC-catalyzed DKR proceeds by two mechanisms, depending on the stereochemistry around the forming bond: 1) a concerted, asynchronous...
Resource Type:: Article
Full Text:: Royal Society of Chemistry Accepted Manuscript http://cdss.library.oregonstate.edu/sa-termsofuse

Creator:: Pattawong, Ommidala, Salih, M. Quamar, Rosson, Nicholas T., Beaudry, Christopher M., and Cheong, Paul Ha-Yeon
Abstract:: Restricted rotations of chemical bonds can lead to the presence of persistent conformational chirality in molecules 10 lacking stereocenters. We report the development of first-ofa- kind predictive rules that enable identification of conformational chirality and prediction of racemization barriers in the diarylether heptanoid (DAEH) natural products that do not possess...
Resource Type:: Article
Full Text:: Chemistry, 12(20), 3303-3309. doi:10.1039/c3ob42550a 10.1039/c3ob42550a Royal Society of Chemistry

Creator:: Johnston, Ryne C. and Cheong, Paul Ha-Yeon
Abstract:: This manuscript describes the role of non-classical hydrogen bonds (NCHBs), specifically C–H···O interactions, in modern synthetic organic transformations. Our goal is to point out the seminal examples where C–H···O interactions have been invoked as a key stereocontrolling element and to provide predictive value in recognizing future and/or potential C–H···O interactions...
Resource Type:: Article

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