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- W2075327099 startingPage "2015" @default.
- W2075327099 abstract "The 1H and 13C resonance shifts of the geminal nuclei in N,N-diethyl, -dibenzyl, -di-isopropyl, and -tetramethylene derivatives of 5-oxo-4-phenyl-2,5-dihydroisoxazol-2-ium-3-olates have been measured in various solvents and (CD3)2SO–CDCl3 mixtures. It is concluded that the accidental isochrony of the geminal hydrogens of the N,N-diethyl derivative in (CD3)2SO is not due to a change in conformation. The aim of this work is to discover whether the changes of the relevant chemical shifts are due to the change in the reaction field at the dipole of the molecule, which differs according to the change in dielectric constant of the medium. The use of solvents less polar than (CD3)2SO as well as of some of higher polarity results in well separated anisochrony of the two geminal hydrogens. The different directions and magnitudes of the solvent effects on the chemical shifts of each of the nuclei in the compounds studied are attributed to their different angles, relative to the direction of the reaction field." @default.
- W2075327099 created "2016-06-24" @default.
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- W2075327099 date "1988-01-01" @default.
- W2075327099 modified "2023-09-24" @default.
- W2075327099 title "The effect of solvent on chemical-shift non-equivalence of diastereotopic geminal nuclei in (pro)-chiral N,N-disubstituted 5-oxo-4-phenyl-2,5-dihydroisoxazol-2-ium-3-olates" @default.
- W2075327099 doi "https://doi.org/10.1039/p29880002015" @default.
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