in tetrahydrofuran; methanol T=20°C; Stevens rearrangement, Norrish type II photor.; 3 h;

1: tetrahydrofuran / 1.67 h / 18 - 20 °C / UV-irradiation 2: 76 percent / sodium hydroxide; bromine / H2O / 0.67 h 3: 25 percent / 24 h / 20 °C 4: 62 percent / tetrahydrofuran; methanol / 3 h / 18 - 20 °C / UV-irradiation View Scheme

1: 53 percent / potassium fluoride; p-toluenesulfonyl azide / CHCl3 / 29.5 h / 0 - 10 °C 2: 28 percent / tetrahydrofuran / 28 h / UV-irradiation 3: 62 percent / tetrahydrofuran; methanol / 3 h / 18 - 20 °C / UV-irradiation View Scheme

1: 25 percent / 24 h / 20 °C 2: 62 percent / tetrahydrofuran; methanol / 3 h / 18 - 20 °C / UV-irradiation View Scheme