设计并合成了 5种 5 ,7 二取代 2 ( 2 ,4 二氯苯氧乙酰亚胺基 ) 2H 1,2 ,4 噻二唑并 [2 ,3 a]嘧啶类化合物 5 ,均为未见文献报道的新化合物 .利用1HNMR、元素分析等确定了产物的结构 .初步除草活性测定结果表明 ,化合物 5对阔叶植物有优良的除草活性 ,且有一定的选择性 .为了进一步了解该类化合物的结构 ,也为设计新的除草剂分子提供帮助 ,对其中一种化合物 5b进行了X射线单晶衍射 Five kinds of 5,7-disubstituted 2 (2,4-dichlorophenoxyimino) 2H 1,2,4-thiadiazolo [2,3] a] pyrimidine compounds 5 were designed and synthesized, The new compounds reported in the literature.The structure of the product was confirmed by 1HNMR, elemental analysis, etc. The results of preliminary herbicidal activity showed that compound 5 has good herbicidal activity against broad-leaved plants and has certain selectivity.In order to further understand these compounds Of the structure, but also for the design of new herbicide molecules to help, one of the compounds 5b X-ray single crystal diffraction