1.1: (C4H9)3Sn / AIBN / benzene / 2 h / Heating 2.1: HCl / methanol / 0.5 h / 0 - 20 °C 2.2: (COCl)2; DMSO / CH2Cl2 / 1 h / -78 °C 2.3: 67 percent / N(C2H5)3 / CH2Cl2 / 7 h / -78 °C 3.1: sodium hexamethyldisilazide / tetrahydrofuran; hexamethylphosphoric acid triamide / 3 h / -78 - 20 °C 4.1: HCl / methanol / 1 h / 20 °C 4.2: (COCl)2; DMSO / CH2Cl2 / 0.5 h / -78 °C 4.3: 62 percent / N(C2H5)3 / CH2Cl2 / -78 - 20 °C 5.1: NaN(Si(CH3)3)2 / tetrahydrofuran; hexamethylphosphoric acid triamide / 3 h / -60 - 0 °C 6.1: LiOH / tetrahydrofuran; H2O / 8 h / 20 °C 6.2: 89 percent / Li / liquid ammonia; ethanol / 0.17 h / -78 °C View Scheme