1: 70 percent / 1,4-cyclohexadiene; N2 / benzene / 2 h / 180 °C / 18100.7 Torr 2: 81 percent / PdCl2dppf / diethyl ether / Heating 3: 0.36 g / NBS; AgNO3 / acetone / 10 h / 25 °C 4: 0.27 g / 1,4-cyclohexadiene; N2 / benzene / 2 h / 180 °C / 15514.9 Torr 5: PdCl2dppf / diethyl ether / Heating 6: NaH; MeOH / tetrahydrofuran / 2 h 7: 64 percent / 1,4-cyclohexadiene / benzene / 160 °C / 12411.9 Torr View Scheme

in 1,2-dichloro-benzene T=180°C; Bergman cycloaromatization;

Multi-step reaction with 4 steps 1: 70 percent / 1,4-cyclohexadiene; N2 / benzene / 2 h / 180 °C / 18100.7 Torr2: 81 percent / PdCl2dppf / diethyl ether / Heating3: 0.36 g / NBS; AgNO3 / acetone / 10 h / 25 °C4: 0.27 g / 1,4-cyclohexadiene; N2 / benzene / 2 h / 180 °C / 15514.9 Torr