The main photoproducts initially formed in the
phototransformation of linuron and chlorbromuron in
aqueous solution result from photolysis, i.e.
hydroxylation with release of the halide ion, and from
elimination of a methoxy group. The orientation of the
reaction depends on the wavelength: short
wavelengths (254 nm) favor demethoxylation and
photolysis in the meta position,whereas, with black light longer than 330 nm,
photolysis in the para position is the main reaction
observed. In soils, 4-bromo-3-chloroaniline is identified
as a soil degradation product of chlorbromuron.
