1: 65 percent / NaAlH4 / tetrahydrofuran / 6 h / -50 °C 2: 33.3 percent / 95percent hydrazine / methanol / -60 - 25 °C 3: NaAlH4 / tetrahydrofuran / 6 h / -65 °C 4: 95percent hydrazine / methanol / 1 h / -60 °C View Scheme

1: 33.3 percent / 95percent hydrazine / methanol / -60 - 25 °C 2: NaAlH4 / tetrahydrofuran / 6 h / -65 °C 3: 95percent hydrazine / methanol / 1 h / -60 °C View Scheme

1: NaAlH4 / tetrahydrofuran / 6 h / -65 °C 2: 95percent hydrazine / methanol / 1 h / -60 °C View Scheme