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Featured researches published by Edward Lorance.


Journal of the American Chemical Society | 2009

Neighboring Amide Participation in Thioether Oxidation: Relevance to Biological Oxidation

Richard S. Glass; Gordon L. Hug; Christian Schöneich; George S. Wilson; Tang Man Lee; Malika Ammam; Edward Lorance; Thomas Nauser; Gary S. Nichol; Takuhei Yamamoto

To investigate neighboring amide participation in thioether oxidation, which may be relevant to brain oxidative stress accompanying beta-amyloid peptide aggregation, conformationally constrained methylthionorbornyl derivatives with amido moieties were synthesized and characterized, including an X-ray crystallographic study of one of them. Electrochemical oxidation of these compounds, studied by cyclic voltammetry, revealed that their oxidation peak potentials were less positive for those compounds in which neighboring group participation was geometrically possible. Pulse radiolysis studies provided evidence for bond formation between the amide moiety and sulfur on one-electron oxidation in cases where the moieties are juxtaposed. Furthermore, molecular constraints in spiro analogues revealed that S-O bonds are formed on one-electron oxidation. DFT calculations suggest that isomeric sigma*(SO) radicals are formed in these systems.


Journal of Organic Chemistry | 2010

Electrochemical and chemical oxidation of dithia-, diselena-, ditellura-, selenathia-, and tellurathiamesocycles and stability of the oxidized species.

Dennis H. Evans; Nadine E. Gruhn; Jin Jin; Bo Li; Edward Lorance; Noriko Okumura; Norma A. Macías-Ruvalcaba; Uzma I. Zakai; Shao Zhong Zhang; Eric Block; Richard S. Glass

The diverse electrochemical and chemical oxidations of dichalcogena-mesocycles are analyzed, broadening our understanding of the chemistry of the corresponding radical cations and dications. 1,5-Diselenocane and 1,5-ditellurocane undergo reversible two-electron oxidation with inverted potentials analogous to 1,5-dithiocane. On the other hand, 1,5-selenathiocane and 1,5-tellurathiocane undergo one-electron oxidative dimerization. The X-ray crystal structures of the Se-Se dimer of the 1,5-selenathiocane one-electron oxidized product and the monomeric two-electron oxidized product (dication) of 1,5-tellurathiocane are reported. 1,5-Dithiocanes and 1,5-diselenocanes with group 14 atoms as ring members undergo irreversible oxidation, unlike the reversible two-electron oxidation of the corresponding silicon-containing 1,5-ditellurocanes. These results demonstrate the chemical consequences of the dication stabilities Te(+)-Te(+) > Se(+)-Se(+) > S(+)-S(+), as well as Se(+)-Se(+) > Se(+)-S(+) and Te(+)-Te(+) > Te(+)-S(+).


Photochemistry and Photobiology | 2014

N-Alkoxyheterocycles As Irreversible Photooxidants†

Zofia M. Wosinska; Faye L. Stump; Rajeev Ranjan; Edward Lorance; GeNita N. Finley; Priya P. Patel; Muzamil A. Khawaja; Katie L. Odom; Wolfgang Kramer; Ian R. Gould

Irreversible photooxidation based on N–O bond fragmentation is demonstrated for N‐methoxyheterocycles in both the singlet and triplet excited state manifolds. The energetic requirements for bond fragmentation are studied in detail. Bond fragmentation in the excited singlet manifold is possible for ππ* singlet states with energies significantly larger than the N–O bond dissociation energy of ca 55 kcal mol−1. For the nπ* triplet states, N–O bond fragmentation does not occur in the excited state for orbital overlap and energetic reasons. Irreversible photooxidation occurs in the singlet states by bond fragmentation followed by electron transfer. Irreversible photooxidation occurs in the triplet states via bimolecular electron transfer to the donor followed by bond fragmentation. Using these two sensitization schemes, donors can be irreversibly oxidized with oxidation potentials ranging from ca 1.6–2.2 V vs SCE. The corresponding N‐ethylheterocycles are characterized as conventional reversible photooxidants in their triplet states. The utility of these sensitizers is demonstrated by irreversibly generating the guanosine radical cation in buffered aqueous solution.


Journal of Organic Chemistry | 2014

Hydrothermal Photochemistry as a Mechanistic Tool in Organic Geochemistry: The Chemistry of Dibenzyl Ketone

Ziming Yang; Edward Lorance; Christiana Bockisch; Lynda B. Williams; Hilairy E. Hartnett; Everett L. Shock; Ian R. Gould

Hydrothermal organic transformations under geochemically relevant conditions can result in complex product mixtures that form via multiple reaction pathways. The hydrothermal decomposition reactions of the model ketone dibenzyl ketone form a mixture of reduction, dehydration, fragmentation, and coupling products that suggest simultaneous and competitive radical and ionic reaction pathways. Here we show how Norrish Type I photocleavage of dibenzyl ketone can be used to independently generate the benzyl radicals previously proposed as the primary intermediates for the pure hydrothermal reaction. Under hydrothermal conditions, the benzyl radicals undergo hydrogen atom abstraction from dibenzyl ketone and para-coupling reactions that are not observed under ambient conditions. The photochemical method allows the primary radical coupling products to be identified, and because these products are generated rapidly, the method also allows the kinetics of the subsequent dehydration and Paal-Knorr cyclization reactions to be measured. In this way, the radical and ionic thermal and hydrothermal reaction pathways can be studied separately.


Phosphorus Sulfur and Silicon and The Related Elements | 2008

Chemistry of Mixed Sulfur-, Selenium-, or Tellurium- and Silicon-, or Tin-Containing Heterocycles

Eric Block; Richard S. Glass; Nadine E. Gruhn; Jin Jin; Edward Lorance; Uzma I. Zakai; Shao Zhong Zhang

Lone pair ionization energies for 1,5-dichalcogenocanes containing endocyclic 3,7-R2Si groups and the parent 1,5-dichalcogenocanes, estimated from the TCNE charge-transfer wavelength maxima, are in good agreement with ionization energies directly obtained from photoelectron spectroscopy. These data indicate the occurrence of substantial intra-annular interaction between the chalcogen atoms and silyl groups, consistent with the well-known β -effect of silicon and the novel β-disilyl effect, when R (in R 2 Si) is Me 3 Si.


Journal of the American Chemical Society | 2002

Kinetics of reductive N-O bond fragmentation: the role of a conical intersection.

Edward Lorance; Wolfgang Kramer; Ian R. Gould


Journal of the American Chemical Society | 2000

Synthesis, properties, oxidation, and electrochemistry of 1,2- dichalcogenins

Eric Block; Marc Birringer; Russell Deorazio; Jürgen Fabian; Richard S. Glass; Chuangxing Guo; Chunhong He; Edward Lorance; Quangsheng Qian; T. Benjamin Schroeder; Zhixing Shan; Mohan Thiruvazhi; George S. Wilson; Xing Zhang


Journal of the American Chemical Society | 2004

Barrierless Electron Transfer Bond Fragmentation Reactions

Edward Lorance; Wolfgang Kramer; Ian R. Gould


Organic Letters | 2011

Neighboring Pyrrolidine Amide Participation in Thioether Oxidation. Methionine as a “Hopping” Site

Richard S. Glass; Christian Schöneich; George S. Wilson; Thomas Nauser; Takuhei Yamamoto; Edward Lorance; Gary S. Nichol; Malika Ammam


Journal of the American Chemical Society | 2000

Gas-Phase Photoelectron Spectroscopic and Theoretical Studies of 1,2-Dichalcogenins: Ionization Energies, Orbital Assignments, and an Explanation of Their Color

Richard S. Glass; Nadine E. Gruhn; Dennis L. Lichtenberger; Edward Lorance; John Pollard; Marc Birringer; Eric Block; Russell Deorazio; Chunhong He; Zhixing Shan; Xing Zhang

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Ian R. Gould

Arizona State University

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Eric Block

State University of New York System

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Uzma I. Zakai

University of Wisconsin-Madison

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