1,8-diazabicyclo[5.4.0]undec-7-ene in N,N-dimethyl-formamide T=20°C; 1 h;

1: 98 percent / H2 / 5percent Pd/C / ethanol / 2 h / 3102.9 Torr 2: 51 percent / 10percent aq. sulfuric acid, aq. sodium nitrite / a.) 0 deg C, 15 min, b.) reflux, 15 min View Scheme

1: 18 percent / fuming sulfuric acid, potassium nitrate / 16 h / 100 - 120 °C 2: 98 percent / H2 / 5percent Pd/C / ethanol / 2 h / 3102.9 Torr 3: 51 percent / 10percent aq. sulfuric acid, aq. sodium nitrite / a.) 0 deg C, 15 min, b.) reflux, 15 min View Scheme

sulfuric acid; sodium nitrite a.) 0 deg C, 15 min, b.) reflux, 15 min;

sulfuric acid Diazotization.und anschliessenden Erwaermen;

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anschliessend Erhitzen mit wss. Salzsaeure;