1: With N,N,N',N,-tetramethylethylenediamine; sec.-butyllithium in tetrahydrofuran; hexane; cyclohexane T=-78°C; 2 h; Inert atmosphere; 2: With iodine in tetrahydrofuran; hexane; cyclohexane T=-78 - 20°C; 6.08333 h; Inert atmosphere; 3: With ammonium chloride in tetrahydrofuran; hexane; cyclohexane; water