pyridine; aluminum oxide; pentacarbonyliron(0); carbon monoxide; Azobenzene in chlorobenzene T=180°C; P=105008 Torr; 0.333333 h; other reagent Fe(CO)5/Al2O3 + PdCl2Py2; other temperature: 190, 200, 220 deg C; other pressure: 8 MPa; other time 30 min; Product distribution;