boron trifluoride diethyl etherate in tetrahydrofuran; diethyl ether T=-18 - -12°C; 2.5 h;

toluene-4-sulfonic acid; 2,3-dicyano-5,6-dichloro-p-benzoquinone in benzene 4 h; Heating;

1: Heating 3: 64 percent / diisobutylaluminium hydride / benzene / 0.25 h / 10 °C 4: 83 percent / Et3N / CH2Cl2 / 1 h / 0 °C 5: 16 percent / t-BuOK / tetrahydrofuran / 0.5 h / 20 °C 6: 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

2: 64 percent / diisobutylaluminium hydride / benzene / 0.25 h / 10 °C 3: 83 percent / Et3N / CH2Cl2 / 1 h / 0 °C 4: 16 percent / t-BuOK / tetrahydrofuran / 0.5 h / 20 °C 5: 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

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

1: Heating 3: 64 percent / diisobutylaluminium hydride / benzene / 0.25 h / 10 °C 4: 83 percent / Et3N / CH2Cl2 / 1 h / 0 °C 5: 16 percent / t-BuOK / tetrahydrofuran / 0.5 h / 20 °C 6: 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

sulfuric acid in diethyl ether 48 h; Heating;

PPh3 gold(I) chloro complex; silver trifluoromethanesulfonate in dichloromethane T=20°C; 0.0833333 h; Inert atmosphere;

phosphoric acid T=150°C;

1: 30 percent / Methylene Blue, O2 / CHCl3 / 2.5 h / Ambient temperature; Irradiation 2: 70 percent / concd H2SO4 / diethyl ether / 48 h / Heating View Scheme