1: With sulfuric acid in water T=160°C; 1 h; 2: With sodium hydrogencarbonate in water

1: sec-BuLi / tetrahydrofuran; hexane / 1.) 0 deg C, 2 h, 2.) 0 deg C, 1 h; r.t., 12 h 2: KHMDS / tetrahydrofuran; hexane; toluene / 1.) 0 deg C, 10 min, 2.) r.t., 2 h View Scheme

potassium hexamethylsilazane in tetrahydrofuran; hexane; toluene 1.) 0 deg C, 10 min, 2.) r.t., 2 h; Yield given;

1: With hydrogen bromide in water T=130°C; 20 h; 2: With sodium hydrogencarbonate in water