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应用芳伯胺、二甲胺、二硫化碳及少量粉状氢氧化钠在乙醇溶液内反应,可制成多种三取代硫脲,其中3-(对氯苯基)-1,1-二甲基硫脲为优良的除莠剂,经试验证明其效力与3-(对氯苯基)-1,1-二甲基脲相仿,惟杀草所需时间要长些,但易溶于乙醇及其他价廉的有机溶剂. 2-硝基苯胺、2,4-二硝基苯胺、2-羟基苯胺及2-氨基吡啶与二硫化碳及二甲胺作用均得不到硫脲衍生物,可能是由于苯环上的硝基或羟基与邻位的胺基生成五环或六环内络合物.2-氨基吡啶的结构与酰胺相似,氨基上的氢原子可与环上的氮进行互变异构作用也不生成硫脲. 若在氨基邻位上有一较大的基团,则产率大受影响,这可能是由于“位阻”所致.
Application of primary amine, dimethylamine, carbon disulfide and a small amount of powdered sodium hydroxide in ethanol solution reaction can be made a variety of trisubstituted thioureas, which 3- (p-chlorophenyl) -1,1-dimethyl sulfide Urea is an excellent herbicide and its efficacy has been demonstrated to be similar to that of 3- (p-chlorophenyl) -1,1-dimethylurea but the time needed to kill grass is longer but soluble in ethanol and other Cheap organic solvents.2-nitroaniline, 2,4-dinitroaniline, 2-hydroxyaniline and 2-aminopyridine with carbon disulfide and dimethylamine were not thiourea derivatives may be due to benzene The ring nitro or hydroxyl and the adjacent amino group to generate pentacyclic or hexacyclic complexes .2-aminopyridine structure and amide similar to the amino hydrogen atoms can be ring nitrogen nitrogen tautomerism Thiourea is also not produced by the action, and if there is a larger group at the amino ortho position, the yield is greatly affected, possibly due to “steric hindrance”.