1: LDA / tetrahydrofuran / -100 - 20 °C 2: K2CO3, MeOH, H2O / 2 h / 20 °C 3: (COCl2), DMF / diethyl ether / 2 h / 0 - 20 °C 4: diethyl ether / 16 h / 0 - 20 °C 5: Et3N / PhCO2Ag / 16 h / 20 °C 6: 90 percent / 40 percent aq. HF / tetrahydrofuran / 6 h / 20 °C 7: 62 percent / CrO3 in H2SO4 8: Me3SiI, C5H5N / CHCl3 / 5 h / 60 °C 9: KOH, H2O / 16 h / 20 °C View Scheme