7-Oxabicyclo[2.2.1]heptadiene derivatives: reactivity towards Brønsted acids

7-Oxabicyclo[2.2.1]heptadiene derivatives can be converted to phenols, fulvenes and/or the products from a retro-Diels–Alder-like reaction by treatment with Brønsted acids; the outcome of the reaction depends on the experimental conditions and the nature of the Brønsted acid used.