triethylamine in dichloromethane T=0°C; 1 h;

1: 97 percent / 10percent aq. NaOH / dioxane / 2 h 2: 1 h / 100 °C 3: n-BuLi / tetrahydrofuran; hexane / 2 h / Ambient temperature 4: molecular sieves 4A, L-(+)-diethyl tartrate, titanium tetraisopropoxide, tert-butylhydroperoxide / CH2Cl2; 2,2,4-trimethyl-pentane / -20 °C 5: KOH / ethanol / 4 h / Ambient temperature 6: 99 percent / Et3N / CH2Cl2 / 1 h / 0 °C View Scheme

1: molecular sieves 4A, L-(+)-diethyl tartrate, titanium tetraisopropoxide, tert-butylhydroperoxide / CH2Cl2; 2,2,4-trimethyl-pentane / -20 °C 2: KOH / ethanol / 4 h / Ambient temperature 3: 99 percent / Et3N / CH2Cl2 / 1 h / 0 °C View Scheme

1: KOH / ethanol / 4 h / Ambient temperature 2: 99 percent / Et3N / CH2Cl2 / 1 h / 0 °C View Scheme