“…A mixture of G0 (618 mg, 3.51 mmol), [5,10,15,20-tetrakis(4-methoxyphenyl)-21H,23H-porphinato]cobalt(II) (500 mg, 0.63 mmol), and triethylsilane (418 mg, 3.60 mmol) in 200 mL of 2-propanol-dichloromethane (1:1) was stirred at 28 • C under oxygen at atmospheric pressure for 24 h. The solvent was removed under reduced pressure, and then the crude product was subjected to a silica gel column with CHCl 3 -acetone (20:1) to yield gentianone (IS, 606 mg, 3.17 mmol, 90% yield). IS: Colorless needles.…”