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- W4236627209 abstract "The conformations of (±)-trans-2,3-Bis(1-naphthyl)-15-crown-5 (1) and -18-crown-6 (2) are investigated by MM2 and dynamic 1H-NMR spectroscopy. The most stable conformation is the diequatorial one in both the free ligands and the alkali metal complexes 1 · NaClO4 and 2 · KClO4. Three rotamers, pseudo-aa, pseudo-ee, and pseudo-ae, with respect to the spatial arrangement of the naphthyl groups, were found as calculated minima by MM2 and experimentally by low-temperature NMR, with fair agreement of the rotational barriers. In the cation-reinforced crowns the rotation rates are significantly diminished. The distribution of the rotamers depends on the size of the crown and its state, free or complexed." @default.
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- W4236627209 date "1998-02-01" @default.
- W4236627209 modified "2023-09-26" @default.
- W4236627209 title "Conformers and Rotamers of (±)-trans-2,3-Bis(2-naphthyl)-15-crown-5 and -18-crown-6 and Their Alkali Metal Complexes" @default.
- W4236627209 doi "https://doi.org/10.1002/(sici)1099-0690(199802)1998:2<403::aid-ejoc403>3.3.co;2-h" @default.
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