2,3-Dichlorotetrahydropyran (3) reacted with propane-1,3-dithiol, ethane-1,2-dithiol, and ethanethiol in the presence of titanium(IV) chloride to give the corresponding tetrahydrofuran-2-carbaldehyde dithioacetals [(2a),(2b), and (4a), respectively]; the action of strong base on (2a), its mono-sulphoxide (7), and (9)(the sulphone of an analogous monothioacetal) was examined.
A. Mottoh and C. B. Reese, J. Chem. Soc., Chem. Commun., 1984, 1028 DOI: 10.1039/C39840001028
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