A series of substituted 2,4-Biphenyl-l,3-oxazolines were synthesized and their acaricidal secticidal activities were examined. When either or both of the ortho-positions of the 2-phenyl substituted with halogen(s), an acaricidal activity against two-spotted spider mites (Tetranychus) was observed as an effect on their eggs (ovicidal activity). Hydrophobic substituents at the position of the 4-phenyl group of 2-(2,6-difluorophenyl)-4-phenyl-l,3-oxazoline enhanced the acaricidal activi and induced an insecticidal activity against green rice leafhoppers (Neophotettix cincticeps), moths (Plutella xylostella), and green peach aphids (Myzus persicae). When the 1,3-oxazoline exchanged to either 1,3-oxazole or 4-methyl-l,3-oxazoline, both acaricidal and Insecticidal significantly decreased.
One hundred and twelve N-aryl-2-methyl-2-arylpropanamides and N-aryl-2-methyl-2arylbutanamides were synthesized and their herbicidal activities were measured. Most of the compounds exhibited strong herbicidal activity against Echinochloa oryzicola VASING., Scirpus juncoides ROXB. subsp. juncoides ROXB. and Cyperus serotinus RoTTB. in pot tests. Introduction of substituents into the two benzene rings varied the activity to different extents. Both a meta alkyl substituent in the amine moiety and an ortho substituent in the acid moiety contributed to high activity, whereas introduction of strong electron-withdrawing substituents at the para position in the amine moiety or bulky substituents at the para position in the acid moiety was unfavorable to the activity. Among the compounds, N-(3-propylphenyl)-2methyl-2-(2-methoxyphenyl)butanamide showed the strongest activity against the test plants, completely killing Echinochloa oryzicola VASING. at a dose of 0.625 g a. i. /a in pot tests.
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