1. Synthesis of diazetidines 2. Synthesis of dioxetanes 3. Synthesis of oxazetidines 4. Synthesis of thietanes-I 5. Synthesis of thietanes-II 6. Synthesis of dithietes 7. Synthesis of thiazetidines 8. Synthesis of azetines and oxetanes 9. Photochemical synthesis of azetes, dioxetanes, and thietes