1: With n-butyllithium; diisopropylamine in tetrahydrofuran; hexane T=-78°C; 3 h; 2: With tri-isopropoxy-borane in tetrahydrofuran; hexane T=-78°C; 1 h; 3: With hydrogen bromide in water pH=6;

magnesium sulfate in diethyl ether T=20°C; 16 h;