1: Methyltriphenylphosphonium bromide With n-butyllithium in toluene T=20°C; 2 h; 2: 3,5-di(3-buten-1-yloxy)benzaldehyde in toluene T=45 - 50°C; 17 h;

1.1: 74 percent / pyridinium chlorochromate / CH2Cl2 / 2 h / 20 °C 2.1: n-butyllithium / toluene / 2 h / 20 °C 2.2: 84 percent / toluene / 17 h / 45 - 50 °C View Scheme