manganese(IV) oxide in tetrahydrofuran; dichloromethane T=20°C; 37 h;

1.1: lithium triethylborohydride / tetrahydrofuran / 1.17 h / 5 - 10 °C 1.2: 1.17 h / 10 - 25 °C 2.1: manganese(IV) oxide / dichloromethane; tetrahydrofuran / 8 h View Scheme

Oxonereg; in N,N-dimethyl-formamide T=20°C; 1.5 h; Product distribution / selectivity;