Diphenylpyridines: a new class of herbicides
1992
Kawamura, S. | Hamada, T. | Sato, R. | Sanemitsu, Y. | Sandmann, G. | Babczinski, P.
A novel series of 4-substituted 2,6-diphenylpyridinies was synthesized and found to possess bleaching herbicidal activity. These diphenylpyridines, which incorporate a pyridine nucleus substituted by two phenyl moieties, are new chemical families of bleaching herbicides. The structure-activity relationships indicated very specific structure requirements for herbicidal activity. In general, herbicidal activity was the highest in compounds that contain three substituents: a CF3 at the 2- or 3- position of one phenyl ring, a CF3 group at the 4-position of the other, and a methoxy, ethoxy, or methylthio group at the pyridine 4-position. Physiological and biochemical properties of diphenylpyridines have been also investigated. Their primary mode of action is direct inhibition of phytoene desaturase which results in decreased biosynthesis of colored carotenoides and subsequent photooxidation of chlorophyll in the light.
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