1: 63 percent / 1.) Mg / tetrahydrofuran / 15 h / Ambient temperature 2: 53 percent / 6 N HCl (pH=4) / methanol / 48 h / Ambient temperature 3: 1.) diphenyldisulfide, Et3P 2.) 4,4'-di-tert-butylbiphenyl, metallic lithium / 1.) THF, room temp., 16 h; 2.) THF, -60 deg C, 15 min, 0 deg C, 16 h View Scheme

1: methanol / 8 h / Ambient temperature 2: HCl / methanol / 5 h / Ambient temperature 3: 1.) Pb(OAc)4, 2.) dil. HCl / 1.) CH2Cl2, MeOH, 0 deg C View Scheme