BCl3*Me2S in dichloromethane; 1,2-dichloro-ethane Claisen rearrangement; 18 h; Reflux;

1: diethylaluminium chloride / hexane / 2 h / 20 °C / Inert atmosphere 2: boron tribromide / dichloromethane / 0.42 h / 20 °C / Inert atmosphere View Scheme

diethylaluminium chloride in hexane T=20°C; 2 h; Inert atmosphere;