methyllithium in tetrahydrofuran; diethyl ether T=-30 - 20°C;

1: 93 percent / diethyl ether / 20 °C 2: 55 percent / MeLi / diethyl ether; tetrahydrofuran / -30 - 20 °C View Scheme

1: 1) n-butyllithium / 1) THF, -78 deg C, hexane, 1 h; 2) THF, hexane, 24 h, RT 2: 17 percent / 1) N,N,N,N-tetra-n-butylammonium fluoride trihydrate; 2) glacial acetic acid / tetrahydrofuran / 1 h / Ambient temperature View Scheme

lead dioxide in various solvent(s) T=20°C;