n-butyllithium 1.) THF, pentane, -50 deg C, 1 h, 2.) -20 deg C, 2 h; 25 deg C, overnight; Yield given. Multistep reaction;

1: With sodium tetrahydroborate in methanol; water T=0 - 20°C; 18 h; 2: With hydrogenchloride; water in methanol pH=2; 3: With sodium hydroxide; water in methanol pH=10;