Primary allylic bromides A–Br and 1,3-dithian react to give sulphonium bromides; these form ylides which undergo.[2,3]-sigmatropic rearrangement to 2-substituted 1,3-dithians; hydrolysis then gives the βγ-unsaturated aldehydes A′–CHO. (A′= rearranged allylic system corresponding to A).
E. Hunt and B. Lythgoe, J. Chem. Soc., Chem. Commun., 1972, 757 DOI: 10.1039/C39720000757
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