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Author:Koppel

46 matching references were found.

Bohlmann, F.; Koppel, C.; Muller, B.; Schwarz, H.; Weyerstahl, P., Massenspektrometrische Untersuchung isomerer Kohlenwasserstoffe: Struktur und Bildungsenthalpie stabiler (C13H11+) Ionen, Tetrahedron, 1974, 30, 1011. [all data]

Koppel, C.; Schwarz, H.; Bohlmann, F., Elektronenstossinduzierte fragmentierung von acetylenverbindungen, Org. Mass Spectrom., 1974, 9, 324. [all data]

Koppel, C.; Schwarz, H.; Bohlmann, F., Elektronenstossinduzierte fragmentierung von acetylenverbindungen. VIII. Struktur der stabilen und instabilen ionen[C9H9]+ aus isomeren C9H10- kohlenwasserstoffen, Org. Mass Spectrom., 1974, 8, 25. [all data]

Koppel, C.; Schwarz, H.; Bohlmann, F., Energetische betrachtungen zur intramolekularen solvatisierung von ionen bei der elektronenstossinduzierten fragmentierung von «alpha»,«omega»-bis-(trimethylsilyl)-athern, Org. Mass Spectrom., 1974, 9, 567. [all data]

Koppel, C.; Schwarz, H.; Bohlmann, F., Electron-impact-induced fragmentation of acetylenic compounds. IX. Structure of stable [C9H11]+ ions from isomeric C9H11 chlorides, Org. Mass Spectrom., 1974, 9, 321-323. [all data]

Koppel, C.; Tenczer, J.; Peixoto-Menezes, K.M., Formation of formaldehyde adducts from various drugs by use of methanol in a toxicological screening procedure with gas chromatography-mass spectrometry, J. Chromatogr., 1991, 563, 1, 73-81, https://doi.org/10.1016/0378-4347(91)80278-K . [all data]

Köppel, C.; Tenczer, J., Gas chromatographic-mass spectrometric study of the urinary metabolism of trimipramine, J. Chromatogr., 1988, 431, 197-202, https://doi.org/10.1016/S0378-4347(00)83085-6 . [all data]

Gunion, R.F.; Koppel, H.; Leach, G.W.; Lineberger, W.C., Photoelectron spectroscopy of C4H4-: Ab initio calculations and dynamics of the 1,2-hydrogen shift in vinylidene, J. Chem. Phys., 1995, 103, 4, 1250, https://doi.org/10.1063/1.469801 . [all data]

Cederbaum, L.S.; Domcke, W.; Koppel, H., Jahn---Teller effect induced by non-degenerate vibrational modes in cumulenes, Chem. Phys., 1978, 33, 3, 319, https://doi.org/10.1016/0301-0104(78)87081-5 . [all data]

Haller, E.; Koppel, H.; Cederbaum, L.S.; von Niessen, W.; Bieri, G., Multimode Jahn--Teller and pseudo-Jahn--Teller effects in BF+3, J. Chem. Phys., 1983, 78, 3, 1359, https://doi.org/10.1063/1.444875 . [all data]

Koppel, H.; Cederbaum, L.S.; Domcke, W.; von Niessen, W., Vibronic coupling in linear molecules and linear-to-bent transitions: HCN, Chem. Phys., 1979, 37, 3, 303, https://doi.org/10.1016/0301-0104(79)85031-4 . [all data]

Marriott, S.; Topsom, R.D.; Lebrilla, C.B.; Koppel, I.; Mishima, M.; Taft, R.W., Proton affinities of substituted cyanides, J. Mol. Struct., 1986, 137, 133. [all data]

Herrero, R.; Davalos, J.Z.; Abboud, J.L.M.; Alkorta, I.; Koppel, I.; Koppel, I.A.; Sonoda, T.; Mishima, M., The intrinsic (gas-phase) acidities of bridgehead alcohols - An experimental (FT-ICR) and computational study, 5Int. J. Mass Spectrom., 2007, 267, 1-3, 302-307, https://doi.org/10.1016/j.ijms.2007.02.056 . [all data]

Koppel, I.; Koppel, J.; Maria, P.C.; Gal, J.F.; Notario, R.; Vlasov, V.M.; Taft, R.W., Comparison of Bronsted acidities of neutral NH-acids in gas phase, dimethyl sulfoxide and water, Int. J. Mass Spectrom., 1998, 175, 1-2, 61-69, https://doi.org/10.1016/S0168-1176(98)00113-X . [all data]

Koppel, I.A.; Koppel, J.; Leito, I.; Koppel, I.; Mishima, M.; Yagupolskii, L.M., The enormous acidifying effect of the supersubstituent =NSO2CF3 on the acidity of derivatives of benzenesulfonamide and toluene-p-sulfonamide in the gas phase and in dimethyl sulfoxide, J. Chem. Soc. Perkin Trans., 2001, 2, 2, 229-232, https://doi.org/10.1039/b005765g . [all data]

Jinfeng, C.; Topsom, R.D.; Headley, A.D.; Koppel, I.; Mishima, M.; Taft, R.W.; Veji, S., Acidities of Substituted Acetic Acids, J. Mol. Struct., 1988, 168, 141, https://doi.org/10.1016/0166-1280(88)80349-X . [all data]

Kutt, A.; Movchun, V.; Rodima, T.; Dansauer, T.; Rusanov, E.B.; Leito, I.; Kaljurand, I.; Koppel, J.; Pihl, V.; Koppel, I.; Ovsjannikov, G.; Toom, L.; Mishima, M.; Medebielle, M.; Lork, E.; Roschentha, Pentakis(trifluoromethyl)phenyl, a Sterically Crowded and Electron-withdrawing Group: Synthesis and Acidity of Pentakis(trifluoromethyl)benzene, -toluene, -phenol, and -aniline, J. Org. Chem., 2008, 73, 7, 2607., https://doi.org/10.1021/jo702513w . [all data]

Guerrero, A.; Herrero, R.; Davalos, J.Z.; Koppel, I.; Abboud, J.L.M.; Chana, A.; Koppel, I.A., Hydrogen-Bonding Interactions of (CF3)(3)CH and (CF3)(3)C- in the Gas Phase. An Experimental (FT-ICR) and Computational Study, J. Phys. Chem. A, 2009, 113, 23, 6422-6429, https://doi.org/10.1021/jp811057m . [all data]

Leito, I.; Raamat, E.; Kutt, A.; Saame, J.; Kipper, K.; Koppel, I.A.; Koppel, I.; Zhang, M.; Mishima, M.; Yagupolskii, L.M.; Garlyauskayte, R.Y.; Filatov, A.A., Revision of the Gas-Phase Acidity Scale below 300 kcal mol(-1), J. Phys. Chem. A, 2009, 113, 29, 8421-8424, https://doi.org/10.1021/jp903780k . [all data]

Abboud, J.L.M.; Koppel, I.A.; Koppel, I., Additivity of substituent effects on the acidity of alcohols, J. Phys. Org. Chem., 2013, 26, 6, 467-472, https://doi.org/10.1002/poc.3110 . [all data]

Koppel, I.; Pikver, R.; Sugis, A.; Suurmaa, E.; Lippmaa, E., FTICR Study of Structure and Solvent Effects on Basicity of Some Anions in the Gas Phase, Org. Reac., 1981, 18, 3. [all data]

Wolf, J.F.; Staley, R.H.; Koppel, I.; Taagepera, M.; McIver, R.T.; Beauchamp, J.L.; Taft, R.W., Gas Phase Basicities and Relative Proton Affinities of Compounds Between Water and Ammonia from Pulsed Ion Cyclotron Resonance Thermal Equilibria Measurements, J. Am. Chem. Soc., 1977, 99, 16, 5417, https://doi.org/10.1021/ja00458a032 . [all data]

Koppel, I.A.; Molder, U.H.; Pikver, R.J., Photoelectron spectra of molecules. I. Alcohols, Org. React. Tartu, 1983, 20, 45. [all data]

Molder, U.H.; Pikver, R.J.; Koppel, I.A., Photoelectron spectra of molecules. 2. Ethers, Org. React. (N.Y. Engl. Transl.), 1983, 20, 208. [all data]

Molder, U.H.; Pikver, R.J.; Koppel, I.A., Photoelectron spectra of molecules. 3. Nitriles, Org. React. Tartu, 1983, 20, 230. [all data]

Molder, U.H.; Pikver, R.J.; Koppel, I.A., Photoelectron spectra of molecules. 4. Amines, Org. React. Tartu, 1983, 20, 355. [all data]

Herrero, R.; Davalos, J.Z.; Abboud, J.L.M.; Alkorta, I.; Koppel, I.; Koppel, I.A.; Sonoda, T.; Mishima, M., The intrinsic (gas-phase) acidities of bridgehead alcohols - An experimental (FT-ICR) and computational study, 5Int. J. Mass Spectrom., 2007, 267, 1-3, 302-307, https://doi.org/10.1016/j.ijms.2007.02.056 . [all data]

Zhang, M.; Badal, M.M.R.; Koppel, I.A.; Mishima, M., Gas-Phase Acidities of alpha- and alpha,alpha-SO2CF3-Substituted Toluenes. Varying Resonance Demand in the Electron-Rich System, Bull. Chem. Soc. Japan, 2013, 86, 7, 813-820, https://doi.org/10.1246/bcsj.20130052 . [all data]

Koppel, I.A.; Taft, R.W.; Anvia, F.; Zhu, S.Z.; Hu, L.Q.; Sung, K.S.; Desmarteau, D.D.; Yagupolskii, L.M., The Gas-Phase Acidities of Very Strong Neutral Bronsted Acids, J. Am. Chem. Soc., 1994, 116, 7, 3047, https://doi.org/10.1021/ja00086a038 . [all data]

Koppel, I.A.; Pihl, V.; Koppel, I.A.; Anvia, F.; Taft, R.W., Thermodynamic acidity of (CF3)3CH and 1H-undecafluorobicyclo[2.2.1]heptane: The concept of anionic (fluorine) hyperconjugation, J. Am. Chem. Soc., 1994, 116, 19, 8654, https://doi.org/10.1021/ja00098a027 . [all data]

Koppel, I.A.; Koppel, J.; Pihl, V.; Leito, I.; Mishima, M.; Vlasov, V.M.; Yagupolskii, L.M.; Taft, R.W., Comparison of Bronsted acidities of neutral CH acids in gas phase and dimethyl sulfoxide, J. Chem. Soc. Perkin Trans., 2000, 2, 6, 1125-1133, https://doi.org/10.1039/b001792m . [all data]

Koppel, I.A.; Koppel, J.; Leito, I.; Koppel, I.; Mishima, M.; Yagupolskii, L.M., The enormous acidifying effect of the supersubstituent =NSO2CF3 on the acidity of derivatives of benzenesulfonamide and toluene-p-sulfonamide in the gas phase and in dimethyl sulfoxide, J. Chem. Soc. Perkin Trans., 2001, 2, 2, 229-232, https://doi.org/10.1039/b005765g . [all data]

Burk, P.; Koppel, I.A.; Rummel, A.; Trummal, A., Can O-H acid be more acidic than its S-H analog? A G2 study of fluoromethanols and fluoromethanethiols, J. Phys. Chem. A, 2000, 104, 7, 1602-1607, https://doi.org/10.1021/jp993487a . [all data]

Guerrero, A.; Herrero, R.; Davalos, J.Z.; Koppel, I.; Abboud, J.L.M.; Chana, A.; Koppel, I.A., Hydrogen-Bonding Interactions of (CF3)(3)CH and (CF3)(3)C- in the Gas Phase. An Experimental (FT-ICR) and Computational Study, J. Phys. Chem. A, 2009, 113, 23, 6422-6429, https://doi.org/10.1021/jp811057m . [all data]

Leito, I.; Raamat, E.; Kutt, A.; Saame, J.; Kipper, K.; Koppel, I.A.; Koppel, I.; Zhang, M.; Mishima, M.; Yagupolskii, L.M.; Garlyauskayte, R.Y.; Filatov, A.A., Revision of the Gas-Phase Acidity Scale below 300 kcal mol(-1), J. Phys. Chem. A, 2009, 113, 29, 8421-8424, https://doi.org/10.1021/jp903780k . [all data]

Abboud, J.L.M.; Koppel, I.A.; Koppel, I., Additivity of substituent effects on the acidity of alcohols, J. Phys. Org. Chem., 2013, 26, 6, 467-472, https://doi.org/10.1002/poc.3110 . [all data]

Koppel, I.A.; Mishima, M.; Stock, L.M.; Taft, R.W.; Topsom, R.D., Acidities of 4-Substituted Benzoic, Bicyclo[2.2.2]Oct-1-yl and Bicyclo[2.2.2]Oct-2-enyl Carboxylic Acids, J. Phys. Org. Chem., 1993, 6, 12, 685, https://doi.org/10.1002/poc.610061205 . [all data]

Koppel, I.A.; Taft, R.U.; Anviya, F.; Kondratenko, N.V.; Yagupolskii, L.M., Superstrong Electron-Acceptor Substituents and Gas Phase Superacidity, Russ. J. Org. Chem., 1992, 28, 1764. [all data]

Taft, R.W.; Koppel, I.J.; Topsom, R.D.; Anvia, F., Acidities of OH Compounds, including Alcohols, Phenols, Carboxylic Acids, and Mineral Acids, J. Am. Chem. Soc., 1990, 112, 6, 2047, https://doi.org/10.1021/ja00162a001 . [all data]

Koppel, I.; Koppel, J.; Maria, P.C.; Gal, J.F.; Notario, R.; Vlasov, V.M.; Taft, R.W., Comparison of Bronsted acidities of neutral NH-acids in gas phase, dimethyl sulfoxide and water, Int. J. Mass Spectrom., 1998, 175, 1-2, 61-69, https://doi.org/10.1016/S0168-1176(98)00113-X . [all data]

Koppel, I.A.; Koppel, J.; Pihl, V.; Leito, I.; Mishima, M.; Vlasov, V.M.; Yagupolskii, L.M.; Taft, R.W., Comparison of Bronsted acidities of neutral CH acids in gas phase and dimethyl sulfoxide, J. Chem. Soc. Perkin Trans., 2000, 2, 6, 1125-1133, https://doi.org/10.1039/b001792m . [all data]

Koppel, I.A.; Koppel, J.; Leito, I.; Koppel, I.; Mishima, M.; Yagupolskii, L.M., The enormous acidifying effect of the supersubstituent =NSO2CF3 on the acidity of derivatives of benzenesulfonamide and toluene-p-sulfonamide in the gas phase and in dimethyl sulfoxide, J. Chem. Soc. Perkin Trans., 2001, 2, 2, 229-232, https://doi.org/10.1039/b005765g . [all data]

Kutt, A.; Movchun, V.; Rodima, T.; Dansauer, T.; Rusanov, E.B.; Leito, I.; Kaljurand, I.; Koppel, J.; Pihl, V.; Koppel, I.; Ovsjannikov, G.; Toom, L.; Mishima, M.; Medebielle, M.; Lork, E.; Roschentha, Pentakis(trifluoromethyl)phenyl, a Sterically Crowded and Electron-withdrawing Group: Synthesis and Acidity of Pentakis(trifluoromethyl)benzene, -toluene, -phenol, and -aniline, J. Org. Chem., 2008, 73, 7, 2607., https://doi.org/10.1021/jo702513w . [all data]

Koppel, L.B.; Smith, J.M., Thermal properties of carbon dioxide in the critical region, J. Chem. Eng. Data, 1960, 5, 437-40. [all data]

Abboud, J.L.M.; Alkorta, L.; Burk, P.; Davalos, J.Z.; Quintanilla, E.; Della, E.W.; Koppel, M.A.; Koppel, W., The enormous apparent gas-phase acidity of cubylamine, Chem. Phys. Lett., 2004, 398, 4-6, 560-563, https://doi.org/10.1016/j.cplett.2004.09.127 . [all data]

Abboud, J.L.M.; Alkorta, L.; Burk, P.; Davalos, J.Z.; Quintanilla, E.; Della, E.W.; Koppel, M.A.; Koppel, W., The enormous apparent gas-phase acidity of cubylamine, Chem. Phys. Lett., 2004, 398, 4-6, 560-563, https://doi.org/10.1016/j.cplett.2004.09.127 . [all data]