hydrogenchloride T=5°C; 18 h;

1: (E)-3-(biphenyl-4-yl)but-2-en-1-ol With oxygen; methylene blue in acetonitrile T=-10°C; 4 h; Irradiation; 2: cyclohexane-1,4-dione With hydrogenchloride in acetonitrile T=5°C; 18 h;

1: O2; methylene blue / acetonitrile / 4 h / -10 - 0 °C / Irradiation 2: aq. HCl / acetonitrile / 18 h / 5 °C View Scheme