diisobutylaluminium hydride in diethyl ether; cyclohexane T=-90°C;

1.1: DIBAL-H / diethyl ether; cyclohexane / -90 °C 2.1: 1.32 g / diethyl ether; cyclohexane / 3 h / 20 °C 3.1: NaH / tetrahydrofuran / 0.5 h / Heating 3.2: 81 percent / tetrahydrofuran / Heating 4.1: [Cl2(PCy3)2Ru=CHPh] / toluene / 25 °C 4.2: NaOH; 2-propanol; [Cl2(PCy3)2Ru=CHPh] / toluene / 2 h / 110 °C View Scheme