sodium hydroxide 6 h; Ambient temperature;

Multi-step reaction with 3 steps 1: 85 percent / pyridine / 24 h / 0 °C2: 75 percent / H2 / 10percent Pd/C / ethanol / 2 h / 1292.9 Torr3: 75 percent / 2,4-bis(4-methoxyphenyl)-1,3-dithia-2,4-diphosphetane 2,4-disulfide / toluene / 12 h / 80 °C