6a-Thiathiophthen has been synthesised in 12% overall yield by the sequence γ-pyrone → 4H-pyran-4-thione → 1-oxa-6,6a-dithiapentalene → 6a-thiathiophthen.
D. H. Reid and R. G. Webster, J. Chem. Soc., Perkin Trans. 1, 1972, 1447 DOI: 10.1039/P19720001447
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