)weredetermined:ethyl3,3-dimethylacrylate (0.82±0.19),2-methyl-2-pentenal(0.71±0.16)and6-methyl-5-hepten-2-one(26±7). ThedifferentreactivityoftheunsaturatedoxygenatedcompoundstowardO 3 isdiscussedintermsof theirchemicalstructure.Inaddition,acorrelationbetweenthereactivityofstructurallydifferentun- saturat...