1: Methyltriphenylphosphonium bromide With n-butyllithium in tetrahydrofuran; hexane T=20°C; 0.25 h; 2: bromo-2 trimethoxy-3,4,5 benzaldehyde in tetrahydrofuran; hexane T=20°C; Wittig reaction; 3 h;

1.1: bromine / methanol / 20 °C 2.1: nBuLi / hexane; tetrahydrofuran / 20 °C 2.2: hexane; tetrahydrofuran / 3 h / 20 °C View Scheme

1: triphenyl-methyl-phosphonium iodide With n-butyllithium in tetrahydrofuran; hexane T=0°C; 0.5 h; 2: bromo-2 trimethoxy-3,4,5 benzaldehyde in tetrahydrofuran; hexane T=0 - 25°C;