The deep blue thiones obtained by the photochemical addition of benzo-1,2-dithiole-3-thione to cyclopentene and tetramethylethylene are in thermal equilibrium at ambient temperatures with the corresponding colourless dimers formed by [4 + 4] addition.
P. de Mayo and H. Y. Ng, J. Chem. Soc., Chem. Commun., 1974, 877 DOI: 10.1039/C39740000877
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