1: 70 percent / NH2NH2, KOH / bis-(2-hydroxy-ethyl) ether / 120 deg C, 1 h; 180-190 deg C, 4 h 2: 99 percent / Me3SiI / CHCl3; pyridine / 24 h / 60 °C View Scheme

potassium hydroxide; hydrazine in diethylene glycol 120 deg C, 1 h; 180-190 deg C, 4 h;