Thermal cycloreversion of 2,2-dimethyl-6 (.omega.-hydroxyalkyl)-4H-1,3-dioxin-4-ones: mono-, di-, and trimeric macrocyclic .beta.-keto lactones by intramolecular trapping of (.omega.-hydroxy)acylketenes
Thermal cycloreversion of 2,2-dimethyl-6 (.omega.-hydroxyalkyl)-4H-1,3-dioxin-4-ones: mono-, di-, and trimeric macrocyclic .beta.-keto lactones by intramolecular trapping of (.omega.-hydroxy)acylketenes