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.
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