Treatment of Bunte salts, ZCH2SSO3Na where Z is an electron-withdrawing group, with triethylamine and calcium chloride in the presence of cyclopentadiene or 2,3-dimethylbuta-1,3-diene gives the corresponding cycloadducts of the transient thioaldehydes, ZCHS; the cyclopentadiene adducts dissociate upon heating thereby allowing transfer of the thioldehydes to dimethylbutadiene.
G. W. Kirby, A. W. Lochead and G. N. Sheldrake, J. Chem. Soc., Chem. Commun., 1984, 922 DOI: 10.1039/C39840000922
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