2-Benzothiopyrylium-4-olate, synthesised from isothiochroman-4-one and isolated as the perchloric acid salt, is readily dimerised to give stereoisomeric 5,13 : 6,12-bisepithiodibenzo[a,f]cyclodecenes; the syn-isomer is the major product. Spectroscopic data for both isomers and X-ray data for the syn-form are discussed.
K. Undheim and S. Baklien, J. Chem. Soc., Perkin Trans. 1, 1975, 1366 DOI: 10.1039/P19750001366
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