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Quantitative structure-activity relationships of herbicidalN′-substituted phenyl-N-methoxy-N-methylureas

Authors
Journal
Pesticide Biochemistry and Physiology
0048-3575
Publisher
Elsevier
Publication Date
Volume
23
Issue
3
Identifiers
DOI: 10.1016/0048-3575(85)90095-1

Abstract

Abstract Relationships between three types of herbicidal activity of N′-substituted phenyl- N-methoxy- N-methylureas and substitution at the benzene ring were analyzed by the Hansch-Fujita method. First, the Hill inhibitory activity was correlated with electronic (σ) as well as hydrophobic (π) substituent constants. The existence of an optimum value of hydrophobicity for substituents was suggested to reach the target site of action. Second, bliaching activity observed for the 3-substituted but not for 4-substituted compounds was correlated with π, σ, and steric substituent constant, E s. Third, the postemergent herbicidal activity was shown to correlate linearly with the Hill inhibitory activity, pI 50, and hydrophobic parameter, π.

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