1: Hex-5-en-2-one N,N-dimethylhydrazone With n-butyllithium in tetrahydrofuran 0.5 h; 2: 4-bromo-but-1-ene in tetrahydrofuran T=-78°C; 0.5 h; 3: With hydrogenchloride in dichloromethane; water T=20°C; 10 h;

sodium hydroxide; sodium tetrahydroborate; perchloric acid; mercury(II) diacetate 1.) THF, water, RT, 30 min; 2.) CH2Cl2, water; Yield given. Multistep reaction;