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Synthesis and Insecticidal Activity of Novel Nitropyridyl-Based Dichloropropene Ethers
Aiping Liu1,2, Wanqi Yu3, Minhua Liu1
1National Engineering Research Center for Agrochemicals, Hunan Research Institute of Chemical Industry , Changsha 410007, People's Republic of China.
Abstract:
Dihalopropene ether insecticides are known for good features such as no cross-resistance to other insecticide classes and safety for mammals. Pyridalyl is the only currently commercialized dichloropropene ether insecticide; however, it contains a trifluoromethyl group, the synthesis of which requires harsh reagents and reaction conditions. To search for novel dihalopropene ethers with unique biological activities but without trifluoromethyl groups, a series of nitropyridyl-based dichloropropene ether analogues were synthesized by reacting nitro-based halopyridine with 2,6-dichloro-4-(3,3-dichloroallyloxy)phenol or 2,6-dichloro-4-(3,3-dichloroallyloxy)phenyl 3-hydroxypropyl ether. Bioassay showed that the compounds exhibited potent insecticidal activities against various lepidopteran pests. Particularly, 2,6-dichloro-4-(3,3-dichloroallyloxy)phenyl 3-(5-nitro-2-pyridyloxy)propyl ether (8e) was active against major agricultural pests, and its insecticidal potency was comparable to that of Pyridalyl. Besides the trifluoromethyl group in Pyridalyl, a nitro group on the 5-position of the pyridyl ring is also viable for the development of optimal insecticidal activity.
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