1: 95 percent / LDA / tetrahydrofuran / 0.5 h / -78 °C 2: 96 percent / ZnBr2 / CH2Cl2 / 20 °C 3: 1.) sodium metaperiodate / 1.) MeOH-H2O (9:1), 20 deg C, 16 h; 2.) CCl4, 45 deg C, 1 h View Scheme

1: 96 percent / ZnBr2 / CH2Cl2 / 20 °C 2: 1.) sodium metaperiodate / 1.) MeOH-H2O (9:1), 20 deg C, 16 h; 2.) CCl4, 45 deg C, 1 h View Scheme

sodium periodate 1.) MeOH-H2O (9:1), 20 deg C, 16 h; 2.) CCl4, 45 deg C, 1 h; Yield given. Multistep reaction;