The conjugated meso-diallenes (1a) and (1b), prepared from the corresponding trans,trans-dienes by a two-step procedure, added sulphur dioxide to give 2,5-dimethylenesulpholen derivatives (5) by a disrotatory mode.
K. Kleveland and L. Skattebøl, J. Chem. Soc., Chem. Commun., 1973, 432 DOI: 10.1039/C39730000432
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