Les o-quinodimethanes intermediaires reagissent avec des dienophiles selon une cycloaddition pour donner des composes bicycliques et tricycliques du typenaphtalenecarboxylate-2 demethyle,naphtalenedicarboxylate-2,3 demethyle ounaphto [2,3-c]furannedione-1
The oxidative cyclisation of 5-stannyl-1,3-pentanediol derivatives gave corresponding 4-hydroxytetrahydropyrans in excellent yields, and its applications to the synthesis of dioxabicyclodecane 12 and 4-hydroxy-δ-lactone 14 are also described.