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2,4-二硝基氯苯与超细氟化钾(摩尔比1∶1.2)反应制备2,4-二硝基氟苯,收率88.5%。后者在180°C液相脱硝基氯化制备2,4-二氯氟苯,收率82.5%,纯度高于99.5%,经IR和13CNMR确认其结构。实验表明本合成路线简捷,成本低,此外还探讨了在氟化和氯化时爆炸的原因 相似文献
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以2,4-二氟醚苯为原料,经由Friedel-Crafts酰化,Baeyer-Villiger重排和水解制备得到2‘,4’-二氟-4-羟基联苯,总收率为71.6%。 相似文献
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本章所述的是从1,3,5-三苯制备2,6-二氟苯胺的方法。1,3,5-三氯苯与活化氟化钾变换反应制成1-氯-3,5-二氟苯后在经氯化氟化钾硝化反应后三氯二氟硝基苯的混合物,再经还原后得到4:1的2,6-二氟苯胺和2,4-一胺两种异构体的混合物。 相似文献
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有机中间体合成中的新试剂,新反应,新技术,新工艺:Ⅲ 氟硝基?… 总被引:1,自引:0,他引:1
本文详细介绍了硝基氯苯在季争盐和烷氧基聚氧乙烯醚存在下合成2,4-二氟硝基苯,2,3,4,-三氟硝基苯,5-氯-2,4-二氟硝基苯,2,4,5-三氟硝基苯,5-氯-2-氟-4-(硝基甲基)硝基苯和5-氟-4-氟-2(硝基甲基)硝基苯,2-氯-5-氟-4-硝基苯甲酸和4-氯-5-氟-2-硝基苯甲酸,2,4,5-三氟苯甲酸,2-氯-4,5-二氟苯甲酸的最新合成工艺。 相似文献
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2,4—二氯—5—氟苯甲酰乙酸甲酯生产工艺改进 总被引:1,自引:0,他引:1
讨论了2,4-二氯-5-氟苯甲酰乙酸甲酯生产中,碳酸二甲酯的回收和纯化。确定了通过破坏碳酸二甲酯和甲醇的共沸现象而得到高质量的碳酸二甲酯,回收率达82%。 相似文献
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以2,6-二氟苯甲酰胺,次氯酸钠等为原料,合成2,6-二氟苯胺,再与亚硝酸钠反应,得到了2,6-二氟苯酚,总收率达70%以上。 相似文献
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叙述了重要的医药中间体2,4-二氯-5-氟苯甲酰基乙酸乙酯和甲酯的合成。按我们改进的工艺条件进行合成产率较高,原材料消耗有较大幅度的降低。 相似文献
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提出了经氨氧化法制得 2 ,4 二氯苯腈 ,然后水解得到 2 ,4 二氯苯甲酸的合成路线。 2 ,4 二氯甲苯在合适的催化剂和反应条件下 ,2 ,4 二氯苯腈的产率为 89 5 % ,经简单水洗后 ,产品纯度为 98 9%。 2 ,4 二氯苯腈在硫酸中较温和条件水解得到 2 ,4 二氯苯甲酸 ,产率为 95 5 %。 相似文献
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The electrical properties of Ni(II) and Cu(II) chelate polymers of bis(2,4-dihydroxybenzaldehyde), bis(2,4-dihydroxyacetophenone), bis(2,4-dihydroxybenzophenone), bis(2,4-dihydroxybenzaldehyde)ethylenediimine, bis(2,4-dihydroxyacetophenone)-ethylenediimine, bis(2,4-dihydroxybenzophenone)ethylenediimine and bis(2,4-dihydroxyacetophenoneimine) and aromatic acid chlorides have been studied. The chelate polymers with the most rigid structure were found to have the highest conductivities. 相似文献
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以取代苯甲醛为原料,采用醇醛缩合反应和珀金反应完成了反,反-2,4-二甲基-5(对硝基苯基)戊-2,4-二烯酸和反,反-2,4-二甲基-5-(间硝基苯基)戊-2,4-二烯酸的有效全合成,并确定了最佳反应条件,化合物3b为尚未见文献报道的新化合物,其结构经红外光谱,核磁共振证实。 相似文献
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三嗪型紫外线吸收剂的合成及性能 总被引:1,自引:1,他引:1
用格氏试剂偶联法合成了4个有代表性的三嗪型紫外线吸收剂:2,4-双(2,4-二羟基苯基)-6-(4-甲氧基苯基)-1,3,5-三嗪、2,4-双(2,4-二羟基苯基)-6-苯基-1,3,5-三嗪、2-(2,4-二羟基苯基)-4,6-二苯基-1,3,5-三嗪和2,4,6-三(2,4-二羟基苯基)-1,3,5-三嗪,测定了它们的紫外光谱。其中,2,4-双(2,4-二羟基苯基)-6-(4-甲氧基苯基)-1,3,5-三嗪在UVB和UVA都有较强吸收,εmax=36000L/(mol.cm)(λmax=313nm),εmax=36333L/(mol.cm)(λmax=344nm),是其中最好的紫外线吸收剂。 相似文献
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Adsorption characteristics of 2,4-Dichlorophenoxyacetic acid (2,4-D) and 2,4-Dinitrophenol (2,4-DNP) onto granular activated
carbon (GAC) were studied to obtain basic information on their removal from aqueous solution. Single component adsorption
equilibria of 2,4-D and 2,4-DNP dissolved in water have been measured for three kinds of GACs (F400, SLS103, and WWL). In
case of 2,4-D, the magnitude of adsorption capacity was in the order of F400> SLS103>WWL, and that for 2,4-DNP was SLS103>
F400> WWL. The influence of temperature and initial pH of aqueous solution on adsorption has been discussed in detail by using
the Sips equation. 相似文献
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《分离科学与技术》2012,47(16):2329-2336
Adsorption experiments were conducted to study the removal of 2,4-dichlorophenol (2,4-DCP) from aqueous solution by a new low-cost adsorbent-activated bamboo charcoal. The results showed that acidic pH was favorable for the adsorption and removal of 2,4-DCP. Higher initial 2,4-DCP concentrations led to higher adsorption capacity. Most of the adsorption of 2,4-DCP occurred within the first 5 min, and about 90% of 2,4-DCP were removed from solution. After 5 min, the adsorption capacity increased slowly with contact time and the adsorption reached equilibrium in less than 100 min. As the adsorbent dose was increased, the removal of 2,4-DCP was increased, while the equilibrium time was slightly affected. Adsorption kinetics could be best described by the pseudo-second-order model, independent of adsorbent dosages. The adsorption behavior of 2,4-DCP onto bamboo charcoal fitted both Langmuir and Freundlich isotherms well, but followed Freundlich isotherm more precisely. This study demonstrated for the first time that activated bamboo charcoal could be used for the removal of 2,4-DCP in water treatment. 相似文献