C 8 H 10 O 2 S cristallise dans P2 1 /n avec a=11,256, b=5,951 et c=13,099 A, β=114,44 o , Z=4; affinement jusqu'a R=0,063. Confirmation de l'attribution structurale anterieure

Thermally-induced reaction between bicyclo[5.1.0]octa-2,5-diene (I) and sulphur dioxide under dry conditions is toluene-d8 as solvent leads to the unexpected formation of the hitherto unknown diene sulphone 7-thiabicyclo[4.2.1]nona-2,4-diene 7,7-dioxide (II).