1.1: 91 percent / 3-chloroperoxybenzoic acid / CH2Cl2 / 2 h / 20 °C 2.1: 82 percent / stannous chloride; hydrochloric acid / ethanol / 6 h / Heating 3.1: sodium nitrite; hydrochloric acid / H2O / 0.25 h / -5 °C 3.2: 89 percent / potassium iodide / H2O; CH2Cl2 / 4 h / 20 °C 4.1: 13 percent / tributyltin hydride; 2,2'-diazobisisobutyronitrile / 12 h / Heating View Scheme

1.1: 91 percent / 3-chloroperoxybenzoic acid / CH2Cl2 / 2 h / 20 °C 2.1: 82 percent / stannous chloride; hydrochloric acid / ethanol / 6 h / Heating 3.1: sodium nitrite; hydrochloric acid / H2O / 0.25 h / -5 °C 3.2: 89 percent / potassium iodide / H2O; CH2Cl2 / 4 h / 20 °C 4.1: 10 percent / tributyltin hydride; 2,2'-diazobisisobutyronitrile / 12 h / Heating View Scheme