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Photolytic Demethylation of Monuron and Demethylmonuron in Aqueous Solution by Fred S. Tanaka; Ronald G. Wien; Eugene R. Mansager is a Agricultural and Biological Sciences article available to read on EtoBox.

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## Abstract Photochemical demethylation of monuron [3‐(4‐chlorophenyl)‐1, 1‐dimethylurea] and of demethylmonuron [ 1‐(4‐chlorophenyl)‐3‐methylurea] in aqueous solution was investigated. The photoproducts identified in this study were formaldehyde, formic acid and carbon dioxide. These products indicate that demethylation occurs either by oxidation of a methyl group to hydroxymethyl which is readily cleaved to yield formaldehyde, or by further oxidation to an __N__‐formyl group, which is slowly hydrolysed under weakly acidic conditions to yield formic acid. Samples equilibrated either with air or oxygen (> 99 % purity) gave essentially the same yield of oxidation products. Experimental evidence indicated that extensive photodegradation of formaldehyde was occurring during photolysis, causing low recoveries of formaldehyde. Consequently, with [^2^H~3~‐__methyl__]demethylmonuron and deuterated water, only steady state concentrations of formaldehyde could be measured in an isotopic study.

Who reads Photolytic Demethylation of Monuron and Demethylmonuron in Aqueous Solution?

Author

Fred S. Tanaka; Ronald G. Wien; Eugene R. Mansager

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 1526-498X)

Published

1982

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)