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- W2037668725 abstract "The major isomer obtained by hydrogenation of dibenzo-24-crown-8 ether is shown to have the cis-syn-cis configuration as determined from the crystal structure of its sodium perchlorate complex. This material possesses eight-coordinate sodium with Na—O distances ranging from 2.54 to 2.78 Å. The complex is shown to exist in a single asymmetric conformation below 240 K as determined by 13 C NMR at 125 MHz. From NMR coalescence temperature measurement, the free energy of activation for cyclohexane ring inversion in this complex has been determined to be 51.0 ± 0.6 kJ/mol." @default.
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- W2037668725 date "1992-06-01" @default.
- W2037668725 modified "2023-09-26" @default.
- W2037668725 title "The sodium perchlorate complex of cis-syn-cis dicyclohexano-24-crown-8 ether. X-ray crystal structure and solution conformations as studied by variable temperature 13C NMR spectroscopy at 125 MHz. An example of eight-coordinate sodium" @default.
- W2037668725 doi "https://doi.org/10.1139/v92-212" @default.
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