Diimidazolo[32]metacyclophane (5a), a novel [32]metacyclophanediene (4) derivative, was synthesized by the ring transformation of the oxazole rings of dioxazolo[32]metacyclophane (1a) to imidazole rings. On the basis of proton unclear magnetic resonance (1H-NMR) spectroscopy, the preferred conformation of 5a in solution at room temperature could be assigned as a syn from.
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Sasaki et al. (1988) studied this question.