1: (4-Methoxybenzyl)(triphenyl)phosphonium iodide With potassium tert-butylate in tetrahydrofuran T=20°C; Wittig reaction; 2: ortho-bromobenzaldehyde in tetrahydrofuran Wittig reaction; Reflux;

sodium ethanolate in ethanol

1.1: N,N-dimethyl-formamide / 10 h / 20 °C / Inert atmosphere 2.1: potassium tert-butylate / tetrahydrofuran / 0.5 h / 0 °C / Inert atmosphere 2.2: 12 h / 0 - 20 °C / Inert atmosphere View Scheme