1.1: n-butyllithium / hexane; tetrahydrofuran / 1.5 h / 0 - 20 °C 1.2: 2 h / 0 - 20 °C 1.3: 2 h / |Reflux 2.1: hydrazine hydrate / 1 h / |Reflux View Scheme

1.1: n-butyllithium / hexane; tetrahydrofuran / 1.5 h / 0 - 20 °C 1.2: 2 h / 0 - 20 °C 1.3: 2 h / |Reflux 2.1: hydrazine hydrate / 1 h / |Reflux View Scheme

hydrazine hydrate 1 h; Reflux;