Sulphur monoxide reacts with trans-3,4-diphenylhexa-1,3,5-triene (I) to form 2,7-dihydro-4,5-diphenylthiepin 1-oxide (II) and with cyclohepta-1,3,5-triene (V) to form dihydroheptafulvalene (ditropyl)(VI). These reactions can be understood if one assumes that sulphur monoxide reacts in the 3Σ– electronic state.
R. M. Dodson and J. P. Nelson, J. Chem. Soc. D, 1969, 1159 DOI: 10.1039/C29690001159
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