Competition between hetero-Diels-Alder and cheletropic addition of sulfur dioxide. Theoretical and experimental substituent effects on the relative stability of 3,6-dihydro-1,2-oxathiin-2-oxides (sultines) and 2,5- dihydrothiophene-1,1-dioxides (sulfolenes). Anomeric effects in sultine and 6-substituted derivatives

1. Fernández, T.
2. Suárez, D.
3. Sordo, J.A.
4. Monnat, F.
5. Roversi, E.
6. De Castro, A.E.
7. Schenk, K.
8. Vogel, P.