Sulfur dioxide insertion into a range of (4-alkylcyclohex-2-enyl)-,(5-alkylcyclohex-2-enyl)-, and (6-al-kylcyclohex-2-eny1) stannanes has been studied for the solvents chloroform and methanol, and the reaction proceeds y-regiospecifically (with allylic rearrangement) to provide the 0-sulfiiate. For chloroform solvent, syn stereospecificity was observed (and hence sulfur dioxide insertion is less sensitive to steric factors than trifluoroacetolysis) ...
