Thiepane (also hexathiophane) is the organosulfur compound with the formula (CH2)6S. Thiepanes are seven-membered ring that contains sulfide. The parent thiepane has seldom been studied.
A variety of derivatives are known. Hexathiathiepane (CAS RN 17233-71-5, m.p. 90 °C) is CH2S6. A naturally occurring derivative is lenthionine, 1,4-(CH2)2S5.
Thiepane itself may be a product of spontaneous coal fires in post-mining waste heaps.
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