1: 64 percent / diisobutylaluminium hydride / benzene / 0.25 h / 10 °C 2: 83 percent / Et3N / CH2Cl2 / 1 h / 0 °C 3: 16 percent / t-BuOK / tetrahydrofuran / 0.5 h / 20 °C 4: solid / 0.33 h / 15 - 20 °C / Irradiation; photolysis of benzene solution; photochemistry and rearrangements of bicyclo<3.1.0>hex-3-en-2-ones; solution photolysis, solution behavior; solid-state photolysis, crystal lattice behavior View Scheme