potassium tert-butylate in tert-butyl alcohol T=20°C; 0.0833333 h; Inert atmosphere;

1: 64 percent / LDA / tetrahydrofuran / 1 h / Ambient temperature 2: 95 percent / ZnBr2 / CH2Cl2 / 28 h / Ambient temperature 3: 1.) NaIO4 / 1.) MeOH, H2O, r.t., 15 h, in the dark, 2.) toluene, reflux, 5 h View Scheme

1: 95 percent / ZnBr2 / CH2Cl2 / 28 h / Ambient temperature 2: 1.) NaIO4 / 1.) MeOH, H2O, r.t., 15 h, in the dark, 2.) toluene, reflux, 5 h View Scheme

sodium periodate 1.) MeOH, H2O, r.t., 15 h, in the dark, 2.) toluene, reflux, 5 h; Yield given. Multistep reaction;

Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;