1: Methyltriphenylphosphonium bromide With n-butyllithium in tetrahydrofuran; hexane 1 h; 2: 4-[(1,1-dimethylethyl)dimethylsilyloxy]benzaldehyde in tetrahydrofuran; hexane T=20°C;

1: 98 percent / triethylamine / CH2Cl2 / 2 h / 20 °C 2: 75 percent / nBuLi / hexane; tetrahydrofuran / 4 h / 20 °C View Scheme

1: 98 percent / triethylamine / CH2Cl2 / 2 h / 20 °C 2: 75 percent / nBuLi / hexane; tetrahydrofuran / 4 h / 20 °C View Scheme

1: 4-vinylphenyl acetate Alkaline hydrolysis; 2: tert-butyldimethylsilyl chloride Further stages.;