hydrogen; W-2 Raney nickel in methanol; water; acetic acid P=760 Torr; 5 h; Ambient temperature;

1: phenyl isocyanate, Et3N / benzene / 1) room temperature, 2) 2 h, reflux 2: 71 percent / 0.5 N NaOH / methanol 3: 61 percent / H2 / W-2 Raney nickel / methanol; acetic acid; H2O / 5 h / 760 Torr / Ambient temperature View Scheme