由苯氧乙酸出发 ,经多步反应 ,制得 3 苯氧甲基 4 氨基 5 巯基 1,2 ,4 三唑 ,它与 2 氯 2′ ,4′ 二氟苯乙酮进行环化反应 ,生成 3 苯氧甲基 6 (2 ,4 二氟苯基 ) 7H 1,2 ,4 三唑并 [3 ,4 b] [1,3 ,4]噻二嗪 ,通过元素分析、红外光谱、核磁共振氢谱与碳谱、质谱进行表征 ,并利用单晶X射线衍射法测定其结构 .晶体属单斜晶系 ,P2 1/c空间群 ,a =1 3 3 9(3 )nm ,b =1 4683 (4 )nm ,c =0 860 6(2 )nm ,β =10 8 49(2 )° ,Z =4,F(0 0 0 ) =73 6,R1=0 0 5 0 9.还对均三唑并噻二嗪、均三唑并噻二唑两类稠杂环的晶体结构作了比较 Starting from phenoxyacetic acid, 3-phenoxymethyl 4-amino-5-mercapto 1,2,4-triazole was obtained through multiple reaction steps, which was cyclized with 2-chloro 2 ’, 4’-difluoroacetophenone to give 3 Phenoxymethyl 6 (2,4-difluorophenyl) 7H 1,2,4-triazolo [3,4] [1,3,4] thiadiazine was characterized by elemental analysis, IR, NMR 1H-NMR, 1H-NMR, 13C-NMR, 1H-NMR and 13C-NMR spectra. The crystal structure is monoclinic, P2 1 / c space group 4683 (4) nm, c = 0 860 6 (2) nm, β = 10 8 49 (2) °, Z = 4, F (0 0 0) = 73 6, R1 = 0 0 5 0 The crystal structures of two kinds of heterocycles, ie, triazole and thiadiazole, were compared