1: (ethyl)-triphenylphosphonium bromide With n-butyllithium in tetrahydrofuran; hexane T=-15 - 20°C; 2: N-acetyl-N-(2-formylbenzyl)-2-phenoxyaniline in tetrahydrofuran; hexane T=20°C; Wittig reaction; 1 h;

1.1: 77 percent / NaH / dimethylformamide; various solvent(s) / 20 °C 2.1: 85 percent / p-toluenesulfonic acid monohydrate / acetone / 6 h / 20 °C 3.1: n-butyllithium / tetrahydrofuran; hexane / -15 - 20 °C 3.2: 86 percent / tetrahydrofuran; hexane / 1 h / 20 °C View Scheme

1.1: 96 percent / Et3N / CH2Cl2 / 1.5 h / 20 °C 2.1: 77 percent / NaH / dimethylformamide; various solvent(s) / 20 °C 3.1: 85 percent / p-toluenesulfonic acid monohydrate / acetone / 6 h / 20 °C 4.1: n-butyllithium / tetrahydrofuran; hexane / -15 - 20 °C 4.2: 86 percent / tetrahydrofuran; hexane / 1 h / 20 °C View Scheme

1.1: 85 percent / p-toluenesulfonic acid monohydrate / acetone / 6 h / 20 °C 2.1: n-butyllithium / tetrahydrofuran; hexane / -15 - 20 °C 2.2: 86 percent / tetrahydrofuran; hexane / 1 h / 20 °C View Scheme