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The utility of C‐13 NMR in detecting transannular interactions of a carbonyl group with O, S and N in eight‐membered ring compounds has been studied. The C‐13 carbonyl chemical shifts were determined in two solvents, employing frequency‐sweep and pulse/Fourier transform techniques. The results confirm earlier conclusions based upon other physical methods and indicate that C‐13 NMR should prove useful in studies of such interactions.
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Nakashima et al. (1972) studied this question.
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