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• W2014519726 abstract "The average vicinal coupling constants of 1-bromo-2-chloroethane at different temperatures have been obtained in a gas-phase 1H NMR study of 1,2-disubstituted ethanes. Analysis of the experimental data, assuming a ”static” model with constant values for the vicinal coupling constants of the individual rotamers, yielded unacceptable results. A ”dynamic” model, which takes into account the torsional vibrations, has therefore been developed and used to analyse the gas-phase results. The values at 305 K for the vicinal coupling constants of the individual rotamers are: trans rotamer JT = 13.6 Hz, J't = 4.9 Hz; gauche rotamer 12(JG1 + JG2) = 0.9 Hz, 12(J'G1 + J'G2) = 7.8 Hz. These couplings are temperature-dependent with JT changing about four times as much as the other coupling constants. Analysis of the average vicinal coupling constants, measured in different solvents, with the “dynamic” model gave values for the vicinal coupling constants of the individual rotamers in excellent agreement with those from the gas-phase data. The value of 12(JG1+ JG2) decreases noticeably with increasing dielectric constant of the solution. This can be explained by changes in the average dihedral angle between the coupling protons, in the gauche rotamers, which leads to changes of JG1 and JG2 in the same direction." @default.
• W2014519726 created "2016-06-24" @default.
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• W2014519726 date "1980-11-01" @default.
• W2014519726 modified "2023-09-25" @default.
• W2014519726 title "Rotational isomerism. A gas-phase 1H nuclear magnetic resonance study of 1-bromo-2-chloroethane" @default.
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• W2014519726 doi "https://doi.org/10.1016/0022-2860(80)80265-1" @default.
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