1: 1.) NaNO2, 30percent HCl, 2.) 50percent hypophosphorous, / 1.) H2O, -5 to 0 deg C, 2.) 6 h, 2: 91 percent / H2, / 5percent Pt/C, / acetic acid / Ambient temperature 3: 2.) PPA, / 1.) 150 deg C, 1 h, 2.) 150 deg C, 30 min, 3.) reflux, 1 h, View Scheme