Photoinduced electron-transfer oxygenation of 7-methyl-9-(β-d-ribofuranosyl)guaninium salts: A prominent effect of iodide anion

Abstract Irradiation of 7-methyl-9-(2,3,5-tri- O -acetyl-b-D-ribofuranosyl)guaninium iodide ( 1a ) in acetonitrile with a 260 nm UV-light resulted in the formation of 2′,3′,5′-tri- O -acetyl-7-methyl-8-oxoguanosine ( 2 ) via a photoinduced electron-transfer oxygenation.