1: 77 percent / concd. sulfuric acid, sodium nitrite / H2O / 2.5 h / 35 °C 2: 99 percent / thionyl chloride, N,N-dimethylformamide / 2.5 h / Heating 3: 67 percent / 2.5 h / Ambient temperature View Scheme

1: 54 percent / H2 / palladium on charcoal (10percent) 2: 99 percent / thionyl chloride, N,N-dimethylformamide / 2.5 h / Heating 3: 67 percent / 2.5 h / Ambient temperature View Scheme

2.5 h; Ambient temperature;