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Structure revision of spiroleucettadine, a sponge alkaloid with a bicyclic core meager in H-atoms.
- K. N. White, Taro Amagata, A. Oliver, K. Tenney, P. Wenzel, P. Crews
- Chemistry, Medicine
- The Journal of organic chemistry
- 17 October 2008
Our 2004 disclosure of the amino hemiketal-containing spiroleucettadine was met with keen interest by the natural products and synthetic communities. As repeated efforts to synthesize… Expand
Structures and cytotoxic properties of sponge-derived bisannulated acridines.
- Z. Thale, T. Johnson, +7 authors P. Crews
- Chemistry, Medicine
- The Journal of organic chemistry
- 27 December 2002
A reinvestigation of sponge natural products from additional Indo-Pacific collections of Xestospongiacf. carbonaria and X. cf. exigua has provided further insights on the structures, biological… Expand
Is There a Transition-State Imbalance for Proton Transfers in the Gas Phase? Ab Initio Study of the Carbon-to-Carbon Proton Transfer from Acetaldehyde to Its Enolate Ion
- C. F. Bernasconi, P. Wenzel
- Chemistry
- 1 June 1994
Kinetics of Proton Transfer from 2-Nitro-4-X-phenylacetonitriles to Piperidine and Morpholine in Aqueous Me2SO. Solvent and Substituent Effects on Intrinsic Rate Constants. Transition State Imbalances
- C. F. Bernasconi, P. Wenzel
- Chemistry
- 20 November 1996
Rate constants ( ) for the deprotonation of 2-nitro-4-X-phenylacetonitrile, 2-X (X = NO2, SO2CH3, CN, CF3, Br, and Cl) by piperidine and morpholine and for the reverse reaction ( ) have been… Expand
Effect of transition state aromaticity and antiaromaticity on intrinsic barriers of proton transfers in aromatic and antiaromatic heterocyclic systems; an ab initio study.
- C. F. Bernasconi, P. Wenzel
- Chemistry, Medicine
- The Journal of organic chemistry
- 16 November 2010
An ab initio study of two series of carbon-to-carbon proton transfer reactions is reported. The first series refers to the heterocyclic C(4)H(5)X(+)/C(4)H(4)X (X = CH(-), NH, S, O, PH, CH(2), AlH,… Expand
INTRINSIC BARRIERS AND TRANSITION STATE STRUCTURES IN THE GAS PHASE CARBON-TO-CARBON IDENTITY PROTON TRANSFERS FROM NITROMETHANE TO NITROMETHIDE ANION AND FROM PROTONATED NITROMETHANE TO…
- C. F. Bernasconi, P. Wenzel, J. Keeffe, S. Gronert
- Chemistry
- 1 April 1997
The identity carbon-to-carbon proton transfers between nitromethane and nitromethide anion and between oxygen protonated nitromethane and aci-nitromethane have been studied by ab initio methods.… Expand
Proton transfers in aromatic and antiaromatic systems. How aromatic or antiaromatic is the transition state? An ab initio study.
- C. F. Bernasconi, P. Wenzel, M. Ragains
- Chemistry, Medicine
- Journal of the American Chemical Society
- 14 March 2008
An ab initio study of six carbon-to-carbon identity proton transfers is reported. They refer to the benzenium ion/benzene (C6H7(+)/C6H6), the 2,4-cyclopentadiene/cyclopentadienyl anion… Expand
Ab initio study of the carbon-to-carbon identity proton transfer from ketene to its anion in the gas phase.
- C. F. Bernasconi, P. Wenzel
- Chemistry, Medicine
- Journal of the American Chemical Society
- 14 March 2001
Carbon-to-carbon identity proton transfers from propyne, acetimide, thioacetaldehyde, and nitrosomethane to their respective conjugate anions in the gas phase. An ab initio study.
- C. F. Bernasconi, P. Wenzel
- Chemistry, Medicine
- The Journal of organic chemistry
- 12 January 2001
Gas-phase acidities of CH3Y (Y: NO, C identical to CH, CH=NH, and CH=S), barriers to the identity proton-transfer CH3Y + CH2=Y- reversible CH2=Y- + CH3Y, as well as geometries and charge… Expand
Carbanion stabilization by distal silyloxy groups. Origin of the high diastereoselectivity in the formation of quaternary centers with aryllead(IV) triacetate reagents.
- J. Konopelski, Jinzhen Lin, P. Wenzel, H. Deng, G. I. Elliott, Brian S. Gerstenberger
- Chemistry, Medicine
- Organic letters
- 26 October 2002
Derivatives of methyl 5-hydroxy-2-oxo-1-cyclohexanecarboxylate react with aryllead(IV) reagents in high yield and with wide variation in diastereoselectivity. Ab initio calculations are consistent… Expand
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