in chloroform 0.5 h; Ambient temperature;

1: 1.) ethanol; 2.) water, toulene, reflux 2: 82 percent / 0.5 h / 0 °C 3: 1.) 50percent sulfuric acid, sodium nitrite; 2.) urea, sodium iodide-127, sodium sulfite / 1.) 0 deg C, 10 min, water; 2.) 10 min, 0 deg C, water; 3.) 10 min, r.t.; 4.) 6 min, 80 deg C 4: 95 percent / CHCl3 / 0.5 h / Ambient temperature View Scheme

1: 1.) potassium hydroxide / 1.) ethanol, r.t.; 2.) toulene, reflux, overnight 2: 95 percent / CHCl3 / 0.5 h / Ambient temperature View Scheme

1: 82 percent / 0.5 h / 0 °C 2: 1.) 50percent sulfuric acid, sodium nitrite; 2.) urea, sodium iodide-127, sodium sulfite / 1.) 0 deg C, 10 min, water; 2.) 10 min, 0 deg C, water; 3.) 10 min, r.t.; 4.) 6 min, 80 deg C 3: 95 percent / CHCl3 / 0.5 h / Ambient temperature View Scheme

1: 1.) 50percent sulfuric acid, sodium nitrite; 2.) urea, sodium iodide-127, sodium sulfite / 1.) 0 deg C, 10 min, water; 2.) 10 min, 0 deg C, water; 3.) 10 min, r.t.; 4.) 6 min, 80 deg C 2: 95 percent / CHCl3 / 0.5 h / Ambient temperature View Scheme

in chloroform T=65 - 70°C; 0.5 h;

in chloroform T=65 - 70°C; 0.5 h;