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

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