1.1: Me3Al / CH2Cl2; toluene / 3 h / 20 °C 1.2: CH2Cl2; toluene / 16 h / 20 °C 1.3: 96 percent / Rochelle's salt / CH2Cl2; toluene; H2O / 16 h 2.1: Et3N / CH2Cl2 / 4.5 h / 0 - 20 °C 3.1: 4.2 g / NaI / acetone / 16 h / Heating 4.1: 77 percent / acetonitrile / 16 h / Heating 5.1: KHMDS / tetrahydrofuran; CH2Cl2; toluene / 1.75 h / -78 - 20 °C 5.2: 51 percent / aq. HCl; ethyl acetate / tetrahydrofuran; CH2Cl2; toluene View Scheme