Carbon‐13 NMR data of [5]metacyclophane (1a), its 8,11‐dihalosubstituted derivatives 1b‐1d and of some model compounds are reported and discussed. A remarkable downfield shift is observed for the aromatic carbon between the bridging carbons; this is tentatively ascribed to long‐range effects of the bridge and to the bending of the aromatic ring.
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Jenneskens et al. (1986) studied this question.
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