1: hydrogen / 5percent Pd/C / ethanol 2: sodium wire / diethyl ether / 18 h / Ambient temperature 3: ethanol / 7 h / Heating 4: 95 percent / aq. NaOH / ethanol / 60 °C 5: 29 percent / 5 h / 140 - 150 °C View Scheme

1: 1) piperidine, 2) conc. H2SO4 / 1) pyridine 2: hydrogen / 5percent Pd/C / ethanol 3: sodium wire / diethyl ether / 18 h / Ambient temperature 4: ethanol / 7 h / Heating 5: 95 percent / aq. NaOH / ethanol / 60 °C 6: 29 percent / 5 h / 140 - 150 °C View Scheme

1: sodium wire / diethyl ether / 18 h / Ambient temperature 2: ethanol / 7 h / Heating 3: 95 percent / aq. NaOH / ethanol / 60 °C 4: 29 percent / 5 h / 140 - 150 °C View Scheme

1: 95 percent / aq. NaOH / ethanol / 60 °C 2: 29 percent / 5 h / 140 - 150 °C View Scheme

T=140 - 150°C; 5 h;