- Design, synthesis and insecticidal evaluation of aryloxy dihalopropene derivatives
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Plutella xylostella (P. xylostella) is a highly migratory, cosmopolitan species and one of the most important pest of cruciferous crops worldwide. Pyridalyl as a novel class of insecticides has good efficacy against P. xylostella. On the basis of the commercial insecticide pyridalyl, a series of new aryloxy dihalopropene derivatives were designed and synthesized by using Intermediate Derivatization Methods. Their chemical structures were confirmed by 1H NMR, high-resolution mass spectrum (HRMS), and single-crystal X-ray diffraction analysis. The insecticidal activities of the new compounds against P. xylostella were evaluated. The results of bioassays indicated that most of the compounds showed moderate to high activities at the tested concentration, especially compounds 10e and 10g displayed more than 75% insecticidal activity against P. xylostella at 6.25 mg/L, while pyridalyl showed 50% insecticidal activity at the same concentration. The field trials result of the insecticidal activities showed that compound 10e as a 10% emulsifiable concentrate (EC) was effective in the control of P. xylostella at 75-150 g a.i./ha, and the mortality of P. xylostella for treatment with compound 10e at 75 g a.i./ha was equivalent to pyridalyl at 105 g a.i./ha.
- Yang, Ji-Chun,Li, Miao,Wu, Qiao,Liu, Chang-Ling,Chang, Xiu-Hui
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p. 383 - 390
(2016/01/25)
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- Pyridyl(oxy/thio)phenoxy compounds herbicidal compositions and methods
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Certain novel pyridinyloxyphenoxy alkanoic acids, pyridinylthiophenoxy alkanoic acids, derivatives thereof and related compounds are described. More specifically, these novel compounds bear a fluorine substituent in the 3-position of the pyridinyl group and in the 5-position the substituent is selected from chlorine, CF3, CF2 Cl or CF2 H. These novel compounds exhibit surprising preemergent and postemergent activity in the control of grassy weeds.
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- 2-[4-(5-chloro-3-fluoropyridin-2-yloxy)-phenoxyl]-propionic acid methyl ester with herbicidal activity
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There is described the novel 2-[4-(5-Chloro-3-fluoropyridin-2-yloxy)-phenoxy]-propionic acid methyl ester and its (R)-enantiomer. STR1 These compounds are suitable for selectively controlling weeds in crops of cultivated plants, and for reducing the growth of grasses.
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- 3-Fluoropyridyl-2-oxy-phenoxy derivatives having herbicidal activity
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New 3-fluoropyridyl-2-oxy-phenoxy derivatives are disclosed which have a herbicidal and plant growth inhibiting action. They correspond to the formula STR1 wherein X is halogen or trifluoromethyl, G is a C1 -C3 -alkylene chain which
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- 2-phenoxypropionic acid cyanamides as herbicides
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2-Phenoxypropionic acid cyanamides of the formula STR1 have a useful selective herbicidal activity against weeds, preferably grass weeds, in crops of useful plants. In this formula R is hydrogen, C1 -C4 alkyl, C3 -C4
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- Certain pyridyloxy or thio-phenoxy-propanoic acids or salts thereof useful as herbicides
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Certain novel pyridinyloxyphenoxy alkanoic acids, pyridinylthiophenoxy alkanoic acids, derivatives thereof and related compounds are described. More specifically, these novel compounds bear a fluorine substituent in the 3-position of the pyridinyl group and in the 5-position the substituent is selected from chlorine, CF3, CF2 Cl or CF2 H. These novel compounds exhibit surprising preemergent and postemergent activity in the control of grassy weeds.
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- 2-(4-(5-chloro-3-fluoropyridin-2-yloxy)phenoxy)-propionic acid-propynyl ester with herbicidal activity
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There is described the 2-[4-(5-chloro-3-fluoropyridin-2-yloxy)-phenoxy]-propionic acid propynyl ester and its (R)-enantiomer of formula I STR1 These compounds are suitable for selectively controlling weeds in crops of cultivated plants, or for reducing the growth of grasses.
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- Pyridyl(oxy/thio)phenoxy compounds, herbicidal compositions and methods
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Certain novel pyridinyloxyphenoxy alkanoic acids, pyridinylthiophenoxy alkanoic acids, derivatives thereof and related compounds are described. More specifically, these novel compounds bear a fluorine substituent in the 3-position of the pyridinyl group and in the 5-position the substituent is selected from chlorine, CF3, CF2 Cl or CF2 H. These novel compounds exhibit surprising preemergent and postemergent activity in the control of grassy weeds.
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