Photosynthetic electron transport inhibitory and herbicidal activities of 2-(fluorinated methyl)-4-benzylamino-6-methyl-1,3,5-triazines

To investigate the substitution effect of the fluorine atom on methyl group , a methyl group of 2-benzylamino-4,6-dimethyl-1,3,5-triazines was replaced with fluoromethyl, difluoromethyl and trifluoromethyl groups and photosynt hetic electron transport (PET) inhibitory and herbicidal activities of thes e (fluorinated methyl)-1,3,5-triazine compounds were evaluated. With increa sing the number of fluorine atom of fluorinated methyl group, PET inhibitor y activity became higher. Furthermore by introduction of a halogen atom to the 4-position of the benzyl group, PET inhibitory activity was much improv ed compared to the triazines having an un-substituted benzylamino group. Th e (fluorinated methyl)-1,3,5-triazine derivatives with higher PET inhibitor y activity showed also stronger herbicidal activity in soil and foliar appl ication tests.