A novel rearrangement of dithianylcyclobutachromanol derivative 3a on treatment with mercuric oxide and fluoroboric acid in aqueous tetrahydrofuran leads to 1,2,2a,8,9,9a-hexahydro-2a,9a-dimethylcyclobuta[b]-[1]benzoxepin-8,9-dione whose structure is established by X-ray analysis.
B. C. Ranu, S. Bhar, A. Patra, N. P. Nayak and M. Mukherjee, Chem. Commun., 1996, 1965 DOI: 10.1039/CC9960001965
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