Abstract As an extension of organic photochemistry via intermolecular electron-transfer in donor-acceptor pair systems between electron-rich aromatic compounds and electron- deficient tosyl groups, we report here a new protecting group for the amino function, 4-(4, 8- dimethoxynaphthylmethyl) benzenesulfonyl (DNMBS) group, which is readily removed, via an intramolecular electron-transfer followed by hydrolysis, with a high quantum efficiency ...