1: 92 percent / sodium borohydride / methanol / 0.5 h / 20 °C 2: 73 percent / NaOH / diethyl ether; H2O / 0.5 h / 0 °C 3: 63 percent / n-BuLi / hexane; tetrahydrofuran / 0.83 h / -90 - -40 °C 4: 91 percent / anisole; trifluoroacetic acid / 24 h / Heating View Scheme