Green process development for the preparation of 2,6-dibromo-4-nitroaniline from 4-nitroaniline using bromide-bromate salts in an aqueous acidic medium

Pappula Venkatanarayana; Adimurthy Subbarayappa

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Green process development for the preparation of 2,6-dibromo-4-nitroaniline from 4-nitroaniline using bromide-bromate salts in an aqueous acidic medium

机译：使用酸性培养基中的溴溴酸盐制备来自4-硝基苯胺的2,6-二溴-4-硝基苯胺的绿色工艺开发

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An organic solvent-free process for the preparation of 2,6-dibromo-4-nitroaniline, (an important intermediate in the synthesis of azo disperse dyes) from 4-nitroaniline using 2 : 1 bromide-bromate salts under an aqueous acidic medium at ambient conditions has been developed. The 2 : 1 bromide-bromate couple could be obtained by mixing pure NaBr/NaBrO3 salts or by adjusting the 5 : 1 mole ratio of NaBr/NaBrO3 (obtained in an aqueous solution as an intermediate from the bromine manufacture industry by a cold process) to 2 : 1 by the addition of a suitable oxidant. After completion of the reaction the product was purified by simple filtration and washing with water. The aqueous acidic filtrate was recycled up to five times without loss of purity and yield of the product. The method was extended to other aromatic substrates.

机译：用于制备2,6-二溴-4-硝基苯胺的有机溶剂方法，（合成偶氮分散染料的重要中间体）在酸性培养基水溶液下使用2：1溴溴酸盐盐的4-硝基苯胺已经开发了环境条件。通过混合纯Nabr / Nabro3盐或通过调节Nabr / Nabro3的5：1摩尔比（通过冷工艺将在水溶液中获得的水溶液中的中间体中中间体中的5：1摩尔比（通过冷工艺中中间体）来获得2：1溴溴酸酯耦合通过添加合适的氧化剂至2：1。反应完成后，通过简单的过滤和用水洗涤产物。将酸性滤液水溶液再循环至多五次而不会损失产物的纯度和产率。该方法延伸到其他芳族基材。

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《RSC Advances》 |2016年第93期|共4页
作者
Pappula Venkatanarayana; Adimurthy Subbarayappa;
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Cent Salt &

Marine Chem Res Inst CSIR Acad Sci &

Innovat Res GB Marg Bhavnagar 364002 Gujarat India;

Cent Salt &

Marine Chem Res Inst CSIR Acad Sci &

Innovat Res GB Marg Bhavnagar 364002 Gujarat India;

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正文语种 eng
中图分类化学;
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1. Green process development for the preparation of 2,6-dibromo-4-nitroaniline from 4-nitroaniline using bromide-bromate salts in an aqueous acidic medium [J] . Pappula Venkatanarayana, Adimurthy Subbarayappa RSC Advances . 2016,第93期

机译：使用酸性培养基中的溴溴酸盐制备来自4-硝基苯胺的2,6-二溴-4-硝基苯胺的绿色工艺开发
2. GREEN PROCESS DEVELOPMENT FOR THE SYNTHESIS OF ALIPHATIC SYMMETRICAL N,N '-DISUBSTITUTED THIOUREA DERIVATIVES IN AQUEOUS MEDIUM [J] . Jangale Asha D., Kumavat Priyanka P., Wagh Yogesh B., Synthetic Communications . 2015,第1a3期

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Green process development for the preparation of 2,6-dibromo-4-nitroaniline from 4-nitroaniline using bromide-bromate salts in an aqueous acidic medium

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