Experimental and theoretical studies of the gas-phase protonation of vinyl ethers, vinyl sulfides, and vinyl selenides
作者:K. Osapay、J. Delhalle、K. M. Nsunda、E. Rolli、R. Houriet、L. Hevesi
DOI:10.1021/ja00196a002
日期:1989.7
Determination des affinites protoniques par mesure des basicites en phase gazeuse dans un spectrometre a resonance cyclotronique ionique et etude theorique par calculs ab initio MO aux niveaux STO-3G et 3-21G*
Determination des affinites protoniques par mesure des basicites en phasegazeuse dans un spectrometer a Resonance cyclotronique ionique etude theorique par calculs ab initio MO aux niveaux STO-3G et 3-21G*
Trends in alkyl substituent effects on nucleophilic reactions of carbonyl compounds: Gas phase reactions between ammonia and R1R2COCH3+ oxonium ionsElectronic supplementary information (ESI) available: proton affinities, geometries and energies of optimised structures, structures of the stationary points and a plot of experimental and RRKM ln(kae/ksub) against a-stabilisation constants. See http://www.rsc.org/suppdata/ob/b2/b209955c/
作者:Lihn Bache-Andreassen、Einar Uggerud
DOI:10.1039/b209955c
日期:2003.2.11
The reactivity of carbonyl substituted methyl oxonium ions (R1R2COCH3+) towards ammonia has been investigated using an FT-ICR mass spectrometer and ab initio calculations. The monosubstituted ions (R1 = H; R2 = H, CH3, C2H5 and i-C3H7) show different reaction patterns with variable degree of: (1) nucleophilic substitution, (2) addition-elimination and (3) proton transfer, when reacted with ammonia
Stable hydrogen-bonded isomers of covalent ions. Association of carbonium ions with n-donors
作者:Michael Mautner、Mark M. Ross、Joseph E. Campana
DOI:10.1021/ja00303a006
日期:1985.8
Utilisation de l'association des ions carbonium CH 3 CH + OCH 3 et (CH 3 ) 2 C + OCH 3 avec H 2 O et CH 3 OH afin d'obtenir les ΔH f 0 des acetals et hemiacetals protones
利用 de l'association des ions carbonium CH 3 CH + OCH 3 et (CH 3 ) 2 C + OCH 3 avec H 2 O et CH 3 OH afin d'obtenir les ΔH f 0 des acetals et hemiacetals protones
Direct Experimental Determination of the Energy Barriers for Methyl Cation Transfer in the Reactions of Methanol with Protonated Methanol, Protonated Acetonitrile, and Protonated Acetaldehyde: A Low Pressure FTICR Study
作者:Travis D. Fridgen、Jonathan D. Keller、Terry B. McMahon
DOI:10.1021/jp0043165
日期:2001.4.1
The enthalpies of activation were determined to be -16.9 ( 0.6, -16.5 ( 0.6, and -18.4 ( 0.7 kJ mol -1 for the methanol/protonatedmethanol, methanol/protonated acetonitrile, and methanol/protonated acetaldehyde reactions, respectively. These values agree quite well with ab initio-calculated values. The entropies of activation were found to be quite similar for all three reactions within experimental