1: 72 percent / diethyl ether / 30 °C / Irradiation 2: 63 percent / diethyl ether / -78 °C 3: KH, 18-Cr-6 / tetrahydrofuran / 0.42 h / 60 °C 4: 77 percent / toluene / 20 h / 175 °C 5: 82 percent / benzene / Irradiation 6: LiN(SiMe3)2 / tetrahydrofuran / -68 °C View Scheme