1: With potassium hydroxide; ethanol; water 14 h; Heating / reflux; 2: With hydrogenchloride in water T=0°C; pH=2 - 3;

1: With 1,3-Dithiane; n-butyllithium in tetrahydrofuran; cyclohexane T=-30 - -15°C; 2 h; 2: 5-fluoroindan-1-one in tetrahydrofuran T=0°C; 22 h; 3: acetic acid With hydrogenchloride; toluene-4-sulfonic acid more than 3 stages;

1: With n-butyllithium 2: With toluene-4-sulfonic acid 3: With hydrogenchloride; acetic acid