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Pal, S.K. ; Moza, P.N. ; Kettrup, A.

Photochemistry of pendimethalin.

J. Agric. Food Chem. 39, 797-800 (1991)

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Pendimethalin decomposed readily when irradiated in methanol at wavelengths λ ≥ 250 nm to form a number of products. In addition to the N-dealkylated intermediates, the principal products were 2-methyl-4,6-dinitro-5-[(l-ethylpropyl)amino]benzaldehydeand2-methyl-4,6- dinitro-5-[(l-ethylpropyl)amino]benz;yl alcohol. The decomposition at sunlight wavelengths (λ ≥ 290 nm) in methanol is relatively slower and also leads to N-dealkylation and arylmethyl oxidation. Neither acid nor alkali has an effect on the rate of disappearance of pendimethalin. At acidic pH N-dealkylation takes place, whereas at alkaline pH one of the NO2 groups is replaced by an OH group.

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