oxygen; methylene blue; α-ketophenylacetic acid in methanol Irradiation;

1,4-diaza-bicyclo[2.2.2]octane; zinc 5,10,15,20-tetraphenylporphyrin; oxygen in benzene 0.5 h; Irradiationfurther senzitizers, further solvents and additives; MechanismProduct distribution;