1: 87 percent / Br2, Ag2SO4, cc H2SO4, / 1 h 2: 68 percent / H2, / PtO2, / acetic acid / Ambient temperature 3: 2.) PPA, 3.) cc HCl, / 1.) 150 deg C, 1 h, 2.) 150 deg C, 30 min, 3.) AcOH, H2O, reflux, 2 h, 4: 25 percent / hexamethylphosphoric acid triamide / 7 h / 160 °C View Scheme

1: 68 percent / H2, / PtO2, / acetic acid / Ambient temperature 2: 2.) PPA, 3.) cc HCl, / 1.) 150 deg C, 1 h, 2.) 150 deg C, 30 min, 3.) AcOH, H2O, reflux, 2 h, 3: 25 percent / hexamethylphosphoric acid triamide / 7 h / 160 °C View Scheme

in N,N,N',N',N'',N''-hexamethylphosphoric triamide T=160°C; 7 h;

1: 2.) PPA, 3.) cc HCl, / 1.) 150 deg C, 1 h, 2.) 150 deg C, 30 min, 3.) AcOH, H2O, reflux, 2 h, 2: 25 percent / hexamethylphosphoric acid triamide / 7 h / 160 °C View Scheme