9-Thiabicyclo[3,3,1]nona-3,7-diene-2,6-dione (8) has been synthesised. The u.v. spectrum shows anomalous features attributable to intramolecular interactions. The photoelectron spectrum suggests considerable ground state interactions in addition to those in the excited state. Photorearrangement of the dione (8) gives 2-thiabicyclo[3,3,1]nona-3,7-diene-6,9-dione (12).
J. M. Mellor and C. F. Webb, J. Chem. Soc., Perkin Trans. 1, 1972, 211 DOI: 10.1039/P19720000211
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