Direct Photoinduced Electron Transfer from Excited State of Rhodamine B for Carbon-Radical Generation

The photoinduced electron transfer (PIET) from the excited singlet state (S ₁) of rhodamine B to i-C₃F₇I smoothly proceeded in the presence of water. This process was supported by the fluorescence quenching of rhodamine B with addition of i-C₃F₇I in ethanol. The present method was applied to the atom-transfer radical reaction involving the cyclization step.