The [5]metacyclophane derivative (3) was obtained in 55% isolated yield by treatment of (2) with silver perchlorate in the presence of 2,6-lutidine in tetrahydrofuran solution; (3) isomerizes to (6) in acidic solution and is converted by hydrogen bromide in benzene–acetic acid–water into a mixture consisting mainly of (6), (8a), and (8b).
P. Grice and C. B. Reese, J. Chem. Soc., Chem. Commun., 1980, 424 DOI: 10.1039/C39800000424
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