1: 98 percent / K2CO3 / dimethylformamide / 20 h / Ambient temperature 2: 87 percent / NaOBr / dioxane; H2O / 1.) ice-bath, 20 min, 2.) room temperature, 30 min, 3.) reflux, 2.5 h 3: SOCl2 4: 2.) SOCl2 View Scheme

1: 87 percent / NaOBr / dioxane; H2O / 1.) ice-bath, 20 min, 2.) room temperature, 30 min, 3.) reflux, 2.5 h 2: SOCl2 3: 2.) SOCl2 View Scheme

1: SOCl2 2: 2.) SOCl2 View Scheme

thionyl chloride Yield given. Multistep reaction;