1: triphenyl-methyl-phosphonium iodide With n-butyllithium in tetrahydrofuran T=0°C; Wittig Olefination; 0.25 h; Inert atmosphere; 2: 2,5-dibromo-benzaldehyde in tetrahydrofuran 2.25 h; Inert atmosphere;

1: AlCl3 2: Al(OiPr)3, iPrOH 3: KHSO4, benzene-1,2-diol View Scheme

potassium hydrogensulfate; benzene-1,2-diol

1: Al(OiPr)3, iPrOH 2: KHSO4, benzene-1,2-diol View Scheme