Multi-step reaction with 4 steps 1: 90 percent / benzene / 1 h / Ambient temperature2: 75 percent / cc. HCl / methanol / 26 h / Ambient temperature3: 86 percent / sodium carbonate, water / diethyl ether / 8 h / Ambient temperature4: 66 percent / diethyl ether / 48 h / Ambient temperature; from filtrate after 24 h