The synthesis of the alkylated mono-trans-thia[11]annulenes (4a) and (4b) is described, which readily undergo valence isomerization to the dihydrobenzothiepins (5a) and (5b).
A. B. Holmes and F. Sondheimer, J. Chem. Soc. D, 1971, 1434 DOI: 10.1039/C29710001434
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