Synthesis and Herbicidal Activity of 2-Substituted …


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Synthesis and Herbicidal Activity of 2-Substituted ..

Pyrimidine is a 5-membered heterocyclic ring which is versatile lead compound for designing potent bioactive agents. This interesting group of compound has diverse biological activities such as antimicrobial, CNS depressant, anti-inflammatory, analgesic, anti-convulsant, anticancer, antihelmentic, antioxidant and herbicidal. Available data represents that pyrimidine being heterocyclic planar five ...

Synthesis and Herbicidal Activity of New Hydrazide and Hydrazonoyl Derivatives.
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Synthesis and herbicidal activity of 3-aryl-1 ..

A series of novel 3-(substituted alkoxy)pyrazole-4-carboxamide derivatives were synthesized, and their herbicidal activity against various weeds and crop safety were examined under flooded conditions. The herbicidal activity was primarily influenced by the substituent at the 3-position of the pyrazole ring. The benzyloxy group, the -position of which was substituted with an electron-withdrawing group, particularly with a trifluoromethyl group, was most efficient in enhancing the bleaching activity. The level of activity also varied with the -substituent of the carbamoyl group, with -ethoxycarbamoyl group providing the best combination of herbicidal activity and selectivity. Among the compounds synthesized, -ethoxy-1-methyl-3-(3-trifluoromethylbenzyloxy)pyrazole-4-carboxamide (KPP-297), which showed good herbicidal activity against various annual lowland weeds and excellent crop safety at just of 100 g a.i./ha, was considered to be the most promising rice herbicide.

"Synthesis and Herbicidal Activity of New Hydrazide and Hydrazonoyl Derivatives." Molecules 20, no.
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Weng, Q.; Huang, J.; Zeng, Y.; Deng, Y.; Hu, M. Synthesis and Herbicidal Activity Evaluation of Novel β-Carboline Derivatives. Molecules 2012, 17, 3969-3980.

7 Benzthiazuron belongs to urea herbicides, and it is a photosynthesis inhibitor.
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Synthesis and Herbicidal Activity of [(Substituted ..

N,N′-diphenylurea reacted with phosphorus trichloride and phenyl dichlorophosphane giving the heterocyclic compounds 1 and 2 with a direct phosphorus-phosphorus bond (P-P bond), respectively. The new compounds were characterized by elementary analysis, NMR and IR spectra. The results of preliminary bioassay showed that these heterocycles possess selective herbicidal activity at 1.5 kg/hm2.

Synthesis and Herbicidal Activity of Novel N-(2-Fluoro …

A series of 2-methylpropan-2-aminium O-methyl 1-(substituted phenoxyacetoxy)alkylphosphonates (5a-5o) was selectively synthesized by reacting the corresponding O,O-dimethyl 1-(substituted phenoxyacetoxy)-alkylphosphonates with an excess of 2-methylpropan-2-amine. The results of preliminary bioassays show that the title compounds exhibit moderate to good herbicidal activities against Brassica napus and Echinochloa crusgalli. Furthermore, compounds 5a-5j, which show much higher activities than compounds 5k-5o, were selected to further evaluate their post-emergence herbicidal activity at a dosage of 150 g/ha(1 ha=10000 m2). Especially, 2-methylpropan-2-aminium O-methyl 1-[2-(4-chloro-2-methylphenoxy)acetoxy]butylphosphonate(5h) shows 100% inhibitory effect on the growth of Brassica juncea and Amaranthus retroflexus, which is comparable with the commercial herbicide 2,4-dichlorophenoxy acetic acid(2,4-D).

Synthesis and Herbicidal Activity of Novel N- ..

This paper addresses the design and synthetic approach to prepare these fluorinated ketones, interesting hydration properties of these groups as well as the limitations of reactivity and selectivity observed for the Selectfluor® reagent in this series of ketones.

Synthesis and herbicidal activities of benzothiazole N , …

Weng Q, Huang J, Zeng Y, Deng Y, Hu M. Synthesis and Herbicidal Activity Evaluation of Novel β-Carboline Derivatives. Molecules. 2012; 17(4):3969-3980.