1: 42 percent / potassium hydroxide, tetra-n-butylammonium bromide / benzene / 6 h / Ambient temperature 2: 46 percent / 25percent ammonium hydroxide / ethanol / 24 h / 40 °C 3: 28 percent / CHCl3 View Scheme

1: 42 percent / potassium hydroxide, tetra-n-butylammonium bromide / benzene / 6 h / Ambient temperature 2: 46 percent / 25percent ammonium hydroxide / ethanol / 24 h / 40 °C 3: 28 percent / CHCl3 View Scheme

1: 46 percent / 25percent ammonium hydroxide / ethanol / 24 h / 40 °C 2: 28 percent / CHCl3 View Scheme

in chloroform