9,10-Dihydro-11-thia-9,10-ethanoanthracene 11,11-dioxides (1) on thermolysis eject sulphur dioxide and undergo rearrangements either to 9-methylanthracenes at low temperatures or at high temperatures to 5H-dibenzo[a,d]cycloheptenes (2), which have been shown to undergo slow ring inversion.
N. J. Hales, D. J. H. Smith and M. E. Swindles, J. Chem. Soc., Chem. Commun., 1976, 981 DOI: 10.1039/C39760000981
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