1.1: NCS / CH2Cl2 / 1 h / 20 °C 1.2: aq. AcOH / tetrahydrofuran / 2 h / 20 °C 2.1: diethyl ether / 48 h / 0 °C 3.1: aq. NaHCO3 / diethyl ether / 0.05 h / 20 °C 4.1: t-BuLi / pentane; diethyl ether / 0.5 h / -78 °C 4.2: [(n-Bu3P)CuI]4 / pentane; diethyl ether / 0.67 h / -10 °C 4.3: 80 percent / pentane; diethyl ether; tetrahydrofuran / 0.5 h / -60 °C 5.1: benzeneseleninic anhydride / tetrahydrofuran / 1 h / 20 °C 6.1: 515 mg / NaBH4 / ethanol / 7 h / -40 °C 7.1: p-TsOH; water / acetone / 12 h / 20 °C View Scheme