1: 2'-bromo-2,6-bis(1-methylethoxy)biphenyl With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 1 h; 2: chloro-dicyclohexylphosphine in tetrahydrofuran; hexane T=-78 - 20°C;

1: 1,3-bis(1-methylethoxy)benzene With n-butyllithium in hexane 2.5 h; Heating; 2: 1-bromo-2-chloro-benzene in hexane 1.83333 h; Heating;

1.1: 95 percent / K2CO3 / dimethylformamide / 24 h / 70 °C 2.1: n-BuLi / hexane / 2.5 h / Heating 2.2: hexane / 1.83 h / Heating View Scheme