1: With osmium(VIII) oxide; 4-methylmorpholine N-oxide in tetrahydrofuran; water T=50°C; 0.5 h; Inert atmosphere; 2: With sodium periodate in tetrahydrofuran; water T=50°C; 0.166667 h; Inert atmosphere; 3: With ammonium acetate; sodium acetate in tetrahydrofuran; water T=50°C; 0.333333 h; Inert atmosphere;