potassium carbonate in N,N-dimethyl-formamide 3 h; Heating;

sodium ethanolate

1: 35 percent / poliphosphoric acid / benzene / 2 h / 100 °C 2: 80 percent / BBr3*SMe2 / chlorobenzene / 12 h / 130 °C 3: 60 percent / sodium hydride / dioxane / 6 h / 100 °C 4: 60 percent / sodium hydride / dimethylformamide / 3 h / 150 °C 5: 75 percent / aq.HCl / 2 h View Scheme

1: 35 percent / poliphosphoric acid / benzene / 2 h / 100 °C 2: 80 percent / BBr3*SMe2 / chlorobenzene / 12 h / 130 °C View Scheme

PPA in benzene 2 h; Heating;

hydrogenchloride in water; acetone 2 h; Heating / reflux;