hydrazine hydrate in ethanol T=20°C; 2 h; Inert atmosphere; regioselective reaction;

1.1: n-butyllithium / tetrahydrofuran; hexane / 1 h / -78 °C / |Inert atmosphere 1.2: 1 h / -78 - -20 °C / |Inert atmosphere 1.3: 1 h / -20 - 20 °C / |Inert atmosphere 2.1: manganese(IV) oxide / acetone / 2 h / 20 °C / |Inert atmosphere 3.1: hydrazine hydrate / ethanol / 2 h / 20 °C / |Inert atmosphere View Scheme