1.1: 85 percent / p-TsOH / tetrahydrofuran / 24 h / Heating 2.1: LDA / tetrahydrofuran; hexane / 1 h / -78 °C 2.2: 96 percent / tetrahydrofuran; hexane / 2.5 h / -78 - 0 °C 3.1: Et3N / CH2Cl2 / 1 h / 0 °C 4.1: DBU / tetrahydrofuran / 24 h / Heating 5.1: 80 percent / H2; basic aluminia / Pd/C; Pd(OH)2 / ethanol / 24 h / 3102.97 Torr 6.1: 98 percent / Zn(N3)2*2pyr; DEAD; PPh3 / benzene / 24 h 7.1: 62 percent / TiCl4 / CH2Cl2 / 24 h / 20 °C View Scheme