1: With borane-THF in tetrahydrofuran T=5 - 25°C; 18 h; Inert atmosphere; 2: With hydrogenchloride in tetrahydrofuran; 1,4-dioxane 0.5 h;

sodium hydroxide in tetrahydrofuran; dichloromethane; water; ethyl acetate

1: With n-butyllithium in tetrahydrofuran; hexane T=-78 - 20°C; 1.91667 h; 2: With oxygen in tetrahydrofuran; hexane T=-78 - 20°C; 2 h; 3: With dimethylsulfide; triethylamine in tetrahydrofuran; hexane T=20°C; 20 h; Further stages.;