The extrusion of SO2 from 2,2,5,5-tetrasubstituted 3-sulfolenes to give the corresponding 1,3-dienes can be achieved by treatment with ultrasonically dispersed potassium in the presence of a proton source at room temperature. Such a transformation of functionality is difficult to achieve by other methods.
T. Chou and S. Chang, J. Chem. Soc., Perkin Trans. 1, 1992, 1459 DOI: 10.1039/P19920001459
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