1: 4-bromo-1,1'-biphenyl With tert.-butyl lithium in tetrahydrofuran T=-78°C; 0.0333333 h; 2: With sulfur in tetrahydrofuran T=5°C; 0.166667 h; 3: acetyl chloride in tetrahydrofuran T=-78 - 20°C;

1.1: n-BuLi / tetrahydrofuran / -78 °C 2.1: t-BuLi / tetrahydrofuran / 0.03 h / -78 °C 2.2: sulfur / tetrahydrofuran / 0.17 h / 5 °C 2.3: 1.12 g / tetrahydrofuran / -78 - 20 °C View Scheme

ammonium hydroxide in tetrahydrofuran