Several title compounds have been synthesized efficiently from β-angelica lactone by using simple and mild methods that combine bromination and dehydrobromination or debromination processes accomplished in a convenient order. © 1994.
de Echagüen, C. O., & Ortuño, R. M. (1994). The bromination of β-angelica lactone revisited: Synthesis of new 3-bromo-5-methylene- and 3-bromo-5-methyl-2(5H)-furanones. Tetrahedron, 50(43), 12457-12462. https://doi.org/10.1016/S0040-4020(01)89551-X