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排序方式: 共有102条查询结果,搜索用时 15 毫秒
101.
Mingming Dang Minhua Liu Lu Huang Xiaoming Ou Chuyun Long Xingping Liu Yeguo Ren Ping Zhang Mingzhi Huang Aiping Liu 《Journal of heterocyclic chemistry》2020,57(11):4088-4098
A series of novel pyridazinone derivatives were designed and synthesized by replacing 4-(tert-butyl)phenyl moiety of pyridaben with 2-phenylthiazole or oxazole fragments via activity substructure connecting approach. The structures of all target compounds were characterized through NMR, MS, and elemental analysis. Bioassay results exhibit that most compounds showed potent bioactivities against Aphis fabae, Tetranychus urticae, Erysiphe graminis, and/or Puccinia polysora. Among the newly synthesized compounds, 2-(tert-butyl)-4-chloro-5-(((2-phenylthiazol-4-yl)methyl)thio)pyridazin-3(2H)-one ( 12b ) displays remarkable insecticidal activity against A fabae. Its LC50 value (2.73 mg/L) is better than that of pyridaben (5.46 mg/L), although inferior to that of imidacloprid (0.51 mg/L). In addition to its extraordinary insecticidal activity, compound 12b also exerts 96.9% fungicidal activities against P polysora at 500 mg/L in vivo, significantly superior to that of pyridaben (50.0%), while slightly lower than that of tebuconazole (100%). This article discusses the synthesis, bioassay results, and structure-activity relationship of this series of novel pyridazinone derivatives. 相似文献
102.
Wenbin Li Meifang Zhu Xingping Zhou Kensuke Naka Yoshiki Chujo 《高分子科学杂志,A辑:纯化学与应用化学》2013,50(11):1733-1739
The interparticle spacing of carboxyl functionalized gold nanoparticles (Au‐COOH) were mediated by rigid crosslinkers, octa(3‐aminopropyl)octasilsesquioxane (POSS‐NH3 +) and poly(amidoamine) dendrimer terminated with hydroxyl groups (PAMAM‐OH), and a flexible polymeric linker, poly(hexanul viologen) (6‐VP). Regular interparticle spacing was achieved by utilizing POSS‐NH3 + and PAMAM‐OH dendrimer as cross linkers, whereas size growth of Au‐COOH was observed featuring no interparticle spacing by utilizing 6‐VP as the crosslinker. 相似文献