1: 88 percent / Polyphosphorsaeure 2: 90 percent / Ag2O / dimethylformamide 3: 75 percent / 46percent aq. HBr / 2 h / Heating 4: 1.) 0.1N KOH, 2.) KI, K2CO3 / 1.) ethanol, 60 deg C, 30 min, 2.) DMF View Scheme

1: 90 percent / Ag2O / dimethylformamide 2: 75 percent / 46percent aq. HBr / 2 h / Heating 3: 1.) 0.1N KOH, 2.) KI, K2CO3 / 1.) ethanol, 60 deg C, 30 min, 2.) DMF View Scheme

1: 34 percent / Cu 2: 88 percent / Polyphosphorsaeure 3: 90 percent / Ag2O / dimethylformamide 4: 75 percent / 46percent aq. HBr / 2 h / Heating 5: 1.) 0.1N KOH, 2.) KI, K2CO3 / 1.) ethanol, 60 deg C, 30 min, 2.) DMF View Scheme

1: 34 percent / Cu 2: 88 percent / Polyphosphorsaeure 3: 90 percent / Ag2O / dimethylformamide 4: 75 percent / 46percent aq. HBr / 2 h / Heating 5: 1.) 0.1N KOH, 2.) KI, K2CO3 / 1.) ethanol, 60 deg C, 30 min, 2.) DMF View Scheme

potassium hydroxide; potassium carbonate; potassium iodide 1.) ethanol, 60 deg C, 30 min, 2.) DMF; Yield given. Multistep reaction. Yields of byproduct given;