1: 1) n-BuLi / 1) THF, -78 deg C, 0.5h, 2) THF, -78 deg C to RT, 1h 2: orthophosphoric acid / 3 h / 130 °C 3: 66 percent / Raney Nickel / ethanol / 3 h / Ambient temperature View Scheme

1: 2-acetonaphthalene With potassium tert-butylate in tetrahydrofuran 0.25 h; 2: carbon disulfide; methyl iodide in tetrahydrofuran T=20°C; 14 h;

1: sodium tert-butoxide / tetrahydrofuran / 1.5 h / 0 °C 2: 1.74 g / tetrahydrofuran / 1.5 h / 0 °C View Scheme

in tetrahydrofuran T=0°C; 1.5 h;