1: With hydrogenchloride; hydrogen; palladium(II) hydroxide/carbon in tetrahydrofuran; water T=50°C; P=16501.7 Torr; 100 h; 2: With hydrogenchloride; water T=120 - 130°C; 2.5 h; Heating / reflux; 3: With sodium hydroxide; water T=0°C; pH=6 - 7; Product distribution / selectivity;