1.1: 4,4'-di-tert-butyl-2,2'-bipyridine / [Ir(COD)(OMe)]2 / tetrahydrofuran / 16 h / 80 °C 2.1: sodium periodate / tetrahydrofuran; H2O / 0.25 h 2.2: HCl / H2O; tetrahydrofuran / 4 h View Scheme

1: With sodium periodate in tetrahydrofuran; water 0.25 h; 2: With hydrogenchloride in tetrahydrofuran; water 4 h;