1: 70 percent / BuLi / diethyl ether; hexane / from -78 deg C to r.t. 2: 50 percent / Me3SiCl / diethyl ether / 30 h / 90 °C 3: diethyl ether / 23 h / 106 °C / half live time, also in benzene: 90 deg C, 14 d; 150 deg C, 4 d View Scheme

n-butyllithium in diethyl ether; hexane Ambient temperature; Yield given. Yields of byproduct given;