1: 68 percent / NaOEt / 0.5 h / Ambient temperature 2: 55 percent / 70percent HNO3 / 2 h / 30 °C 3: 77 percent / KOH / ethanol / 18 h / 0 °C 4: 70 percent / hexadecyl(tributyl)phosphonium bromide / acetonitrile / 24 h / Ambient temperature 5: 85 percent / 2 M aq. NaOH / ethanol / Heating View Scheme

in ethanol T=20°C; 0.5 h;

sodium ethanolate 0.5 h; Ambient temperature;