Sept-Oct 1982 fhotochemical and Lihemical behaviour ot 2,5-Hydroperoxyhydroxy-2,5-dihydrofurans ML Graziano* and B. Carli Institute of Organic and Biological Chemistry, University of Naples, Naples, Italy Received July 20, 1981 From hydroxyhydroperoxides II and III a new bicyclic system, namely the 5,6-dioxabicyclo[2.1.1]hexane VII is obtained by photolysis or by protic acids. Epimer epoxides IV and XI are obtained on reaction with triethylamine. lull J. ...