2,6-二氟苯胺是合成除草剂氟唑啶草(英文名:Flumetsulam,别名:唑嘧磺草胺,CAS:98967-40-9)的中间体,也是制备苯酰胺类杀虫剂、杀菌剂及液晶材料的重要中间体。以2,6-二氟苯胺为原料合成的除草剂,如美国DOW公司在90年代初开发成功的“Broakstrike”,因其高效、广谱、高选择性、低毒且在环境中不积累、对人畜高度安全等优点,在西方各国被广泛使用,并被誉为绿色环保农药。
碱性2,6-二氟苯胺属于苯胺类衍生物,分子中含有氨基基团,具有一定的碱性。
应用2,6-二氟苯胺是一种浅黄色的液体物质,可用于制造多种杀虫剂、杀菌剂及除草剂,是医药和农药的重要中间体。
合成方法在-5度的冷却环境下,在真空干燥的反应烧瓶中加入2,6-二氟苯甲酰胺、氢氧化钠水溶液以及次氯酸钠水溶液。所得反应混合物在这个温度下搅拌反应1.5小时。可以通过TLC点板监测反应进度,待反应结束后,往体系中加入硫酸氢钠水溶液淬灭反应,再加入乙酸乙酯,摇晃均匀后分离两相。有机层在真空下浓缩即可得到目标产物分子2,6-二氟苯胺。
化学性质浅黄色液体。
用途2,6-二氟苯胺也是重要的农药中间体,可用于生产除草剂氟唑啶草(英文名:Flumetsulam,别名:唑嘧磺草胺,CAS:98967-40-9)。
生产方法2,6-二氟苯甲酰胺经霍夫曼分解可以得到2,6-二氟苯胺。
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
2-氟苯胺 | 2-Fluoroaniline | 348-54-9 | C6H6FN | 111.119 |
2-叠氮基-1,3-二氟苯 | 2,6-difluorophenyl azide | 102284-85-5 | C6H3F2N3 | 155.107 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
2,6-二氟苯肼 | (2,6-difluorophenyl)hydrazine | 119452-66-3 | C6H6F2N2 | 144.124 |
1,3-二氟-2-亚硝基苯 | 1,3-difluoro-2-nitrosobenzene | 29270-54-0 | C6H3F2NO | 143.093 |
2,6-二氟-4-碘苯胺 | 2,6-difluoro-4-iodoaniline | 141743-49-9 | C6H4F2IN | 255.006 |
4-溴-2,6-二氟苯胺 | 4-bromo-2,6-difluoroaniline | 67567-26-4 | C6H4BrF2N | 208.005 |
4-氯-2,6-二氟苯胺 | 4-chloro-2,6-difluoroaniline | 69411-06-9 | C6H4ClF2N | 163.554 |
2,6-二氟异氰酸苯酯 | 2,6-difluorophenyl isocyanate | 65295-69-4 | C7H3F2NO | 155.104 |
2,6-二氟异硫氰酸苯酯 | 2,6-difluorophenylisothiocyanate | 207974-17-2 | C7H3F2NS | 171.17 |
2-叠氮基-1,3-二氟苯 | 2,6-difluorophenyl azide | 102284-85-5 | C6H3F2N3 | 155.107 |
—— | 2,6-difluoro-N,N-dimethylaniline | 55847-15-9 | C8H9F2N | 157.163 |
—— | N-sulfinyl-2,6-diflouroaniline | 80829-40-9 | C6H3F2NOS | 175.159 |
—— | N-ethyl-2,6-difluoroaniline | 13800-03-8 | C8H9F2N | 157.163 |
—— | N-(2,6-difluorophenyl)formamide | 74702-43-5 | C7H5F2NO | 157.12 |
—— | 2,6-difluoro-N-phenylaniline | 95790-71-9 | C12H9F2N | 205.207 |
—— | 2,2',6,6'-tetrafluorodiphenylamine | 1092110-06-9 | C12H7F4N | 241.188 |
—— | 1,3-difluoro-2-(phenyldiazenyl)benzene | 918822-13-6 | C12H8F2N2 | 218.206 |
—— | 2,2',6,6'-tetrafluoroazobenzene | 42808-62-8 | C12H6F4N2 | 254.187 |
3-溴-2,6-二氟苯胺 | 3-bromo-2,6-difluoroaniline | 1262198-07-1 | C6H4BrF2N | 208.005 |
—— | 2,6-difluorophenyliminopropadienone | 487009-30-3 | C9H3F2NO | 179.126 |
4-氨基-3,5-二氟苯甲腈 | 4-amino-3,5-difluorobenzonitrile | 110301-23-0 | C7H4F2N2 | 154.119 |
—— | 2,6-difluoro-N-(2-methylpropyl)aniline | 1039932-02-9 | C10H13F2N | 185.217 |
Halodimethylsulfonium halide 1, which is readily formed in situ from hydrohaloic acid and DMSO, is a good nucleophilic halide. This activated nucleophilic halide rapidly converts aryldiazonium salt prepared in situ by the same hydrohaloic acid and nitrite ion to aryl chlorides, bromides, or iodides in good yield. The combined action of nitrite ion and hydrohaloic acid in DMSO is required for the direct transformation of aromatic amines, which results in the production of aryl halides within 1 h. Substituted compounds with electron-donating or -withdrawing groups or sterically hindered aromatic amines are also smoothly transformed to the corresponding aromatic halides. The only observed by-product is the deaminated arene (usually <7%). The isolated aryldiazonium salts can also be converted to the corresponding aryl halides using 1. The present method offers a facile, one-step procedure for transforming aminoarenes to haloarenes and lacks the environmental pollutants that usually accompany the Sandmeyer reaction using copper halides. Key words: aminoarenes, haloarenes, halodimethylsulfonium halide, halogenation, amination.
Alkyne–azide cycloaddition derivatives of DHZ (