1H and 13C NMR studies of some aromatic dilactones (precursors of paracyclophanes) |
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Authors: | Arlette Solladi-Cavallo Marcel Hilbert |
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Institution: | Arlette Solladié-Cavallo,Marcel Hilbert |
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Abstract: | Carbon-13 and proton NMR data of macrocyclic diaromatic dilactones are presented. The observed behaviour of the spectra as a function of temperature shows that the energy barrier for the re-orientation of the side chains is lower than 49 kJ mol?1 (12 kcal mol?1) and that the energy barrier for the rotation of the aromatic rings is larger than 99 kJ mol?1 (24 kcal mol?1). Hence, chiral substituted dilactones of this type will be resolvable, and the enantiomers can be easily handled at room temperature. |
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