1: diethyl ether / 3 h / 0 - 20 °C / |Inert atmosphere 2: palladium diacetate; triphenylphosphine; caesium carbonate / N,N-dimethyl-formamide / 120 °C / |Inert atmosphere; |Schlenk technique View Scheme

1: ortho-dibromobenzene With isopropylmagnesium chloride lithium chloride complex in tetrahydrofuran T=-15°C; 2.5 h; 2: in tetrahydrofuran T=-20°C; 0.166667 h; 3: 2-thiophenoyl chloride in tetrahydrofuran T=-10°C; 5.5 h;

silica gel; pyridinium chlorochromate in dichloromethane T=20°C; 2 h; Inert atmosphere;

1.1: magnesium / tetrahydrofuran / 1 h / Reflux 1.2: 0 °C / Inert atmosphere 2.1: pyridinium chlorochromate / dichloromethane / 15 h / 20 °C View Scheme