1.1: n-BuLi / diethyl ether; hexane / 0.25 h / -10 - 20 °C 1.2: 21 percent / HCl / ethanol / 12 h / Heating 2.1: 85 percent / NaH / dimethylformamide / -10 - 20 °C 3.1: 84 percent / NiClCpIMes / diethyl ether / 0.17 h / 0 °C View Scheme

1: With n-butyllithium in diethyl ether; hexane T=-10 - 20°C; 0.25 h; 2: With hydrogenchloride in ethanol 12 h; Heating;

1.1: 81 percent / TMEDA; LDA / tetrahydrofuran / -93 - 20 °C 2.1: n-BuLi / diethyl ether; hexane / 0.25 h / -10 - 20 °C 2.2: 50 percent / HCl / ethanol / 12 h / Heating View Scheme

1.1: TMEDA; LDA; triisopropyl borate / H2O2 / tetrahydrofuran / 12 h / 0 - 20 °C 1.2: 57 percent / K2CO3 / acetonitrile / 12 h / Heating 2.1: n-BuLi / diethyl ether; hexane / 0.25 h / -10 - 20 °C 2.2: 31 percent / HCl / methanol / 12 h / Heating View Scheme