Two novel intramolecularly electronical donor-acceptor systemes N-[2-(2-tributylstannylmethyl-sulfenyl)ethyl]phthalimide(1a) and N-(3-tributylstanylpropyl)maleimide(1b),were synthesized,and their photoinduced single electron transfer(SET) reactions in MeOH,CH3CN-30% H2O and pure CH3CN were carried out,respectively.Compound 1a occurred intramolecular SET to provide cyclic amidol 2 with highly yield and high regioselectivity.Compound 1b occurred intramolecular single electron transfer(SET) to provide cyclic a...