1: boron trifluoride diethyl etherate / hexane / -10 - 20 °C / |Inert atmosphere 2: 1 h / 0 °C View Scheme

1: With zirconocene dichloride; ethylaluminum dichloride; magnesium in tetrahydrofuran 6 h; Inert atmosphere; 2: With hydrogenchloride; water in tetrahydrofuran Inert atmosphere;

T=0°C; 1 h;