bis(cyclohexanyl)borane in tetrahydrofuran T=-15 - 20°C; 12 h;

1: 85 percent / dicyclohexylborane / tetrahydrofuran / 12 h / -15 - 20 °C 2: 0.21 g / K2CO3 / CH2Cl2 / 1 h / 20 °C 3: 0.15 g / LiAlH4 / tetrahydrofuran / 8 h / 20 °C View Scheme