A K 2 S 2 O 8 ‑mediated electrophilic selenocyclization of 1,7‐dienes for the synthesis of selenium‐containing benzoxepines is developed. This method features good regioselectivity, broad substrate scope, and good functional‐group compatibility. Preliminary mechanistic studies reveal that this transformation may not undergo a free radical process.
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Gao et al. (2025) studied this question.
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