title: Synthesis, herbicidal activities and comparative molecular field analysis study of some novel triazolinone derivatives.
abstract: A series of novel triazolinones were synthesized and their structures were characterized by (1)H NMR, elemental analysis and single-crystal X-ray diffraction analysis. The herbicidal activities were evaluated against Echinochloa crusgalli (L.) Beauv., Digitaria adscendens, Brassica napus and Amaranthus retroflexus. The herbicidal activity data indicated that the title compounds had higher activities with substituted benzyl group moieties than with other groups such as sulfonyl, alkyl, etc. To further investigate the structure-activity relationship, comparative molecular field analysis was performed on the basis of herbicidal activity data. Both the steric and electronic field distributions of comparative molecular field analysis are in good agreement in this work. The results showed that a bulky and electronegative group around the ortho- or para-positions of the benzene ring would possibly lead to higher activity. Based on the comparative molecular field analysis, compound I-23 was designed and synthesized, which display as good herbicidal activities as the commercial herbicide, carfentrazone-ethyl. The activity against Digitaria adscendens is 66.1% under pre-emergence at 300 g of a.i./ha.
authors.affiliation: The Research Institute of Elemento-Organic Chemistry, State-Key Laboratory of Elemento-Organic Chemistry, National Pesticide Engineering Research Center(Tianjin), Nankai University, Tianjin, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Yi
authors.initials: Y
authors.lastname: Ma
authors.forename: Xing-Hai
authors.initials: XH
authors.lastname: Liu
authors.forename: Yong-Hong
authors.initials: YH
authors.lastname: Li
authors.forename: Hai-Bin
authors.initials: HB
authors.lastname: Song
authors.forename: Zheng-Ming
authors.initials: ZM
authors.lastname: Li
mesh_terms: D027721:Amaranthus / Q000187:drug effects; D031746:Digitaria / Q000187:drug effects; D031747:Echinochloa / Q000187:drug effects; D006540:Herbicides / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D013329:Structure-Activity Relationship; D014230:Triazoles / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology
chemical_list: D006540:Herbicides; D014230:Triazoles