1: 1-lt;(tert-butyldimethylsilyl)oxygt;-2-(4-bromophenyl)ethane With n-butyllithium in tetrahydrofuran; hexane T=-90 - -80°C; 1 h; Inert atmosphere; 2: N,N-dimethyl-formamide in tetrahydrofuran; hexane T=-100 - -10°C; Wittig reaction; 0.5 h; Inert atmosphere;

1.1: 1H-imidazole / dichloromethane / 1 h / 20 °C / Inert atmosphere; Cooling with water bath 2.1: n-butyllithium / tetrahydrofuran; hexane / 1 h / -90 - -80 °C / Inert atmosphere 2.2: 0.5 h / -100 - -10 °C / Inert atmosphere View Scheme

1.1: 1H-imidazole / dichloromethane / 1 h / 20 °C / Inert atmosphere; Cooling with water bath 2.1: n-butyllithium / tetrahydrofuran; hexane / 1 h / -90 - -80 °C / Inert atmosphere 2.2: 0.5 h / -100 - -10 °C / Inert atmosphere View Scheme

1.1: lithium aluminium tetrahydride / tetrahydrofuran / 12 h / 20 °C / Inert atmosphere; Cooling with water bath 2.1: 1H-imidazole / dichloromethane / 1 h / 20 °C / Inert atmosphere; Cooling with water bath 3.1: n-butyllithium / tetrahydrofuran; hexane / 1 h / -90 - -80 °C / Inert atmosphere 3.2: 0.5 h / -100 - -10 °C / Inert atmosphere View Scheme