PPA T=120°C;

1: 87 percent / NaNO2, HBF4 (34percent) / H2O / 0.5 h / -8 - -2 °C 2: 115 - 120 °C 3: 77 percent / ethanol / 16 h / Heating 4: H2 / Pd-C, 10percent / ethanol / 1 h 5: 50 percent / PPA / 120 °C View Scheme

1: 77 percent / ethanol / 16 h / Heating 2: H2 / Pd-C, 10percent / ethanol / 1 h 3: 50 percent / PPA / 120 °C View Scheme

1: H2 / Pd-C, 10percent / ethanol / 1 h 2: 50 percent / PPA / 120 °C View Scheme