Výsledky vyhledávání - "Heinz F. Koch"

Gas-Phase Acidities of Aryl-Substituted Fluorinated Alkanes. The Nature of β-Fluorine Negative Hyperconjugation

Autor: Masaaki Mishima, Heinz F. Koch, Mustanir, Judith G. Koch, José Luis M. Abboud

Publikováno v: Bulletin of the Chemical Society of Japan. 88:455-464

Gas-phase acidities (GA )o f 2-phenyl- and 2-p-nitrophenyl-substituted fluoroalkanes, ArCH2Rf and ArCH(Rf 1 )Rf 2 , were calculated at the B3LYP/6-311+G(d,p) level of theory. The GAvalues of the fluoroalkanes having no fluorine atom at the β-positio

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d1ee5c284864a7e557e8fc63ce5f6b64
https://doi.org/10.1246/bcsj.20140281

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The Competition of the Loss of a Beta Fluoride and Hydron Transfer Between Carbon and Oxygen During Exchange and Elimination Reactions

Autor: Pasquale Iacono, Judith G. Koch, Nicole M. Wedgwood, Heinz F. Koch, Masaaki Mishima

Publikováno v: Zeitschrift für Physikalische Chemie. 222:1175-1184

Reactions of methanolic sodium methoxide with the series p-CF3C6H4C i HClRX [RX is -CH2Cl, -CH2F, -CHClF, -CHF2, -CF2Cl or -CF3] are reported to probe reaction mechanisms for dehydrohalogenation reactions compared to hydron exchange. All of the dehyd

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5b0b2e05a6503381e2e979306e77cdaa
https://doi.org/10.1524/zpch.2008.5381

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Stability of Complexes of Phenylacetylides and Benzyl Alkoxides with Methanol in the Gas Phase. Acid–Base Correlation in the Ionic Hydrogen-Bond Strength

Autor: Mio Matsuoka, Masaaki Mishima, Heinz F. Koch, Mustanir

Publikováno v: Bulletin of the Chemical Society of Japan. 79:1118-1125

The thermodynamic stabilities of methanol-bound phenylacetylides and benzyl alkoxides were determined using a FT-ICR mass spectrometer. The complexation energies between anions and methanol were ev...

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4eeecdbbcc92e8365d66907a1d873d43
https://doi.org/10.1246/bcsj.79.1118

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Comparison of gas-phase acidities of some carbon acids with their rates of hydron exchange in methanolic methoxide

Autor: Adam R. Kurland, Han Zuilhof, Vincent F. DeTuri, Neal M. Abrams, Karen D. Vasey, Jason M. Nichols, Patrick Han, Masaaki Mishima, Judith G. Koch, Heinz F. Koch, Gerrit Lodder, Cecily E. Anders, Anne M. Ruminski, Patricia R. Smith, Justin C. Biffinger

Publikováno v: Journal of Physical Organic Chemistry, 19(5), 308-317
Journal of Physical Organic Chemistry 19 (2006) 5

Hydron exchange reaction rates, k(exch)M(-1) s(-1), using methanolic sodium methoxide are compared with gas-phase acidities, Delta G(Acid)(0) kcal/mol, for four 9-YPhenylfluorenes-9-H-i, seven (YC6H4CH)-H-i(CF3)(2), seven YC6H4-(CHClCF3)-H-i, and (C6

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b90ffb1f44b26f68c97a0189b66a48b1
https://doi.org/10.1002/poc.1057

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Comparing Isotope Effects and Rates for the Methanolic Sodium Methoxide Reactions of 9-R-Fluorene to Those for p-CF3C6H4CHClR (R = CH2Cl, CH2F and CF3)

Autor: Erik L. Ruggles, Anne Marie Van Roon, Martijn Van Laren, William C. Pomerantz, Heinz F. Koch

Publikováno v: Collection of Czechoslovak Chemical Communications. 67:1505-1516

Kinetic primary isotope effects and activation parameters associated with the methanolic sodium methoxide-promoted dehydrohalogenation reactions of 9-(chloromethyl)fluorene and 9-(fluoromethyl)fluorene are reported and compared to for p-CF3C6H4CHClCH

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::da54a7ac898a997a322b4fec538bf91a
https://doi.org/10.1135/cccc20021505

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