1: copper(II) oxide; copper dichloride / acetone / 2.5 h / Reflux 2: hexane / 1 h / 20 °C / Molecular sieve; Inert atmosphere; UV-irradiation View Scheme

1: copper(II) oxide; copper dichloride / acetone / 2.5 h / Reflux 2: hexane / 3 h / 20 °C / Molecular sieve; Inert atmosphere; UV-irradiation 3: hydrogenchloride; water / tetrahydrofuran / 1 h / 20 °C View Scheme

N-bromosuccinmide; water in acetone T=20°C; 1 h;