An iodine-induced cycloisomerization reaction of [2,2]metacyclophanes to form 1,2,3,3a,4,5-hexahydropyrenes has been shown to occur with remarkable ease and with high selectivity and to involve an intermolecular hydrogen-transfer process as shown by experiments using a deuteriated precursor.
T. Sato, K. Nishiyama and A. Murai, J. Chem. Soc., Chem. Commun., 1972, 163 DOI: 10.1039/C39720000163
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