in benzene Ambient temperatureIrradiationlaser flash photolysis; other solvents (10:90 water-MeCN, 7percent OP(OPr)3 in benzene), quenching data (Me2C=CHCH=CMe2 as quencher, in MeCN-H2O, MeOH or benzene, Stern-Volmer plots), oxygen effect; Quantum yieldMechanism;