Amino- and hydrodefluorination of polyfluoroaromatic amines with aqueous ammonia in a steel autoclave. Synthesis of highly pure tetrafluorophenylenediamines
作者:S. Z. Kusov、V. I. Rodionov、T. A. Vaganova、I. K. Shundrina、E. V. Malykhin
DOI:10.1007/s11172-009-0101-8
日期:2009.4
The action of aqueous ammonia on hexafluorobenzene in a steel autoclave at 180—220 °C yields a mixture of isomeric tetrafluorophenylenediamines and 2,4,5-trifluorophenylene-1,3-diamine. The content of the hydrodefluorination product significantly depends on the reaction temperature and time. Tetrafluorophenylene-1,3-diamine undergoes hydrodefluorination with aqueous ammonia in a steel autoclave at 200 °C to give 2,4,5-trifluorophenylene-1,3-diamine; when the additives of NH4F and/or FeCl3 are present, 2,5-difluorophenylene-1,3-diamine is additionally formed. The hydrodefluorination products are not formed during bis-aminodefluorination of hexafluorobenzene with aqueous ammonia in a glass reactor or with anhydrous ammonia (in a mixture with aprotic solvent) in a steel autoclave.
在 180-220 °C 的钢制高压釜中,水氨对六氟苯的作用会产生异构的四氟苯二胺和 2,4,5-三氟苯-1,3-二胺混合物。加氢脱氟产物的含量很大程度上取决于反应温度和时间。四氟苯-1,3-二胺与氨水在钢制高压釜中于 200 °C 下发生氢氟化反应,生成 2,4,5-三氟苯-1,3-二胺;当添加 NH4F 和/或 FeCl3 时,会额外生成 2,5-二氟苯-1,3-二胺。六氟苯在玻璃反应器中与水氨或在钢制高压釜中与无水氨(与无相溶剂的混合物)进行双氨基脱氟反应时,不会形成氢脱氟产物。