Abstract:
Photolysis of napropamide is reported under UV light (λmax ≥ 290 nm) and sunlight (λmax ≥ 250
nm). The rate of photodegradation of napropamide in aqueous methanol (10 µg mL–1) followed
the first-order kinetics under UV (T½=1.09h.) and sunlight (7.72h.). On photolysis in aqueous
methanol, it furnished four photoproducts (F1
, F2
, F3
and F4
) of which F1 was a common photolysis
product isolated from both sunlight and UV light. Photoproducts F2 and F3 were generated from
UV irradiated solution and only F4 from sunlight irradiated solution. The plausible mechanism of
photo transformation involved oxidation, dimerization, hydrolysis as well as nucleophilic
displacement reactions.
