hydrogen; acetic acid; palladium on activated charcoal in ethanol T=25°C; P=3102.89 Torr; 6 h;

1: 88 percent / benzene / 3 h / Heating 2: 95 percent / H2; AcOH / Pd/C / ethanol / 6 h / 25 °C / 3102.89 Torr View Scheme

hydrogenchloride; tin

2: acetic acid; sodium acetate; bromine 3: aqueous HCl 4: sodium nitrite; water; hydrochloric acid / Behandeln der erhaltenen wss. Diazoniumsalz-Loesung mit Hypophosphorigsaeure (Phosphinsaeure) bei 0grad View Scheme

2: acetic acid; sodium acetate; bromine 3: aqueous KMnO4 4: aqueous H2SO4 View Scheme