1.1: 100 percent / Grubbs first generation catalyst / toluene / 12 h / 80 °C 2.1: LAH / tetrahydrofuran / 12 h / 20 °C 3.1: toluene / 12 h / 80 °C 3.2: 0.21 g / K2CO3 / methanol / 12 h 4.1: 82 percent / O2 / benzene / 20 h / Irradiation View Scheme