TheDiels-Alder adduct of phencyclone and N-npropylmaleimide has been studied in CDC1, solution at ambient temperatures by one-and two-dimensional 'H NMR (300 MHz) and "C NMR ( 7 5 MHz) techniques. Clear evidence is presented from slow exchange limit (SEL) spectra for hindered rotation of the bridgehead phenyls in the adduct. Full 'H spectral assignments have been made via selective homonuclear decoupling and high resolution COSY experiments. The number of signals in the aryl region of 13C NMR spectra also indicated slow rotation about the C (sp') -C (sp') bond to the unsubstituted bridgehead phenyls.
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