caesium carbonate in acetone T=20°C; 0.166667 h;

Multi-step reaction with 2 steps 1.1: n-butyllithium; zinc dibromide / tetrahydrofuran; hexane / 0.5 h / -78 °C1.2: 24 h / 80 °C / 8791.75 Torr / Pressure reactor2.1: methanol; boron tribromide / dichloromethane / 0.02 h / -78 °C / Inert atmosphere