Multi-step reaction with 2 steps 1: 80 percent / pentane / 1.) 0 deg C, overnight, 2.) room temperature, 5 days2: 94.3 percent / 10percent HCl / tetrahydrofuran / 1 h  

Multi-step reaction with 3 steps 1: 90.6 percent / lithium / tetrahydrofuran; diethyl ether / 2.5 h / 0 °C2: 80 percent / pentane / 1.) 0 deg C, overnight, 2.) room temperature, 5 days3: 94.3 percent / 10percent HCl / tetrahydrofuran / 1 h