Sulphur dioxide, as solvent or in chloroform, catalyses the isomerization of quadricyclane (1) to norbornadiene and cycloadds to (1) to afford exo-3-oxa-4-thiatricyclo [4.2.1.02,5]non-7-ene-4-oxide (3); in the presence of a deficiency of sulphur dioxide,(3) is remarkably stable in solution, but decomposes rapidly as pure product.
O. De Lucchi and V. Lucchini, J. Chem. Soc., Chem. Commun., 1982, 464 DOI: 10.1039/C39820000464
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