新试剂苯并噻唑重氮氨基偶氮苯与镉的显色反应研究及其应用

在Ｔｒｉｔｏｎ Ｘ－１００存在下，ｐＨ９．０－１０．０时，新试剂苯并噻唑重氮氨基偶氮苯与镉形成３：１的橙红色络合物，最大吸收波长位于５３０ｎｍ，表观摩尔吸光系数为１．９１×１０＾－５Ｌ．ｍｏｌ＾－１；ｃｍ＾－１，镉量在０－１２μｇ／２５ｍＬ范围内遵守比尔定律。在混合掩蔽剂存在下，显色反应具有良好的选择性，直接应用于工业废水中微量镉的测定，获得了满意的结果。     

New amidoesters of thiophosphoric acid

The Todd-Atherton reaction of dialkyl thiophosphonates orO-alkyl piperididothiophosphonates with monoethanolamine vinyl ether afforded the corresponding amidoesters of thiophosphoric acid. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1876–1877, September, 1998.     

Boron Trifluoride Etherate-Alcohol,a Versatile Reagent for the Esterification Reaction

Esterification is an important reaction to all chemists and is used more commonly than any other reaction in organic syntheses, biochemical and pharmaceutical research and in medicinal chemistry.     

新型Fenton试剂氧化降解有机物

新型Fenton试剂氧化降解有机物;次氯酸;Fenton试剂;降解有机物     

Oxa-Michael加成反应的研究新进展

Oxa-Michael加成反应是一类重要的反应, 经常被用于天然产物的合成, 但该反应直到近几年才被深入研究. 简要综述了oxa-Michael加成反应的研究进展.     

Nazarov Reagent: New Role for the [4+2] Domino Benzannulation Reaction to Construct Polysubstituted Benzenes

A new role for the Nazarov reagent was revealed in the [4+2] benzannulation reaction, and delivered a series of polyfunctional benzenes in high yields under mild conditions. This metal‐free process not only expanded the application of the Nazarov reagent in organic synthesis, but also provided a new, efficient way to construct polyfunctional benzenes.     

利用Grignard试剂的甲酰化反应合成对甲氧基苯甲醚

二取代苯并咪唑盐;利用Grignard试剂的甲酰化反应合成对甲氧基苯甲醚     

Derivatization Reaction of Carbohydrates with Urea as the Reagent and Fluorimetric Determination of Carbohydrates

ＩｎｔｒｏｄｕｃｔｉｏｎＣａｒｂｏｈｙｄｒａｔｅｓｐｌａｙａｎｅｓｓｅｎｔｉａｌｒｏｌｅｉｎｎａｔｕｒｅａｎｄａｌｍｏｓｔａｌｌｔｈｅｌｉｆｅｐｒｏｃｅｓｓｅｓ .Ｔｈｅｙａｒｅｎｏｔｏｎｌｙｃｅｎｔｒａｌｔｏｔｈｅｇｅｎｅｒａｔｉｏｎａｎｄｓｔｏｒａｇｅｏｆｅｎｅｒｇｙｂｕｔａｌｓｏｕｓｅｆｕｌｉｎｔｈｅｄｉａｇｎｏｓｉｓｏｆｄｉｓｅａｓｅｓａｎｄｄｙｎａｍｉｃａｄｊｕｓｔｍｅｎｔｆｏｒｔｈｅｆｕｎｃｔｉｏｎｓｏｆｐｒｏｔｅｉｎ .Ｓｏｅｓｔａｂｌｉｓｈｉｎｇｈｉｇｈｓｅｎｓｉｔｉｖｅａｎｄｅｆｆ…     

双环戊二烯基二氯化钛催化下格氏试剂与偕二卤代烷的反应

近年来,双环戊二烯基二氯化钛在有机合成中的应用得到迅速发展,从而开发了多种新型反应。其中双环成二烯基二氯化钛催化下,Grignard试剂的还原反应是研究得极为广泛的一类新反应。Cp_2Ticl_2/RMgX体系可以还     

新显色剂1-偶氮苯-3-(5-氰基-2-吡啶)-三氮烯的合成及其与镉的显色反应

报道了新显色剂1-偶氮苯-3-(5-氰基-2-吡啶)-三氮烯的合成及其与镉的显色反应。在表面活性剂OP存在下,pH 11.0的Na2B4O7-NaOH缓冲溶液中,该试剂与镉发生显色反应,生成4∶1型的红色配合物。配合物的最大吸收峰位于525 nm,表观摩尔吸光系数为2.02×105L.mol-1.cm-1。Cd2+的线性范围为1~0.6μg/mL。用拟定方法测定废水中微量镉,结果令人满意。     

对甲基二溴偶氮胂的合成及其与稀土显色反应的研究

本文报道了对甲基二溴偶氮胂的合成,该显色剂在酸性介质中与稀土元素产生高灵敏度显色反应,大多数常见元素不干扰,所拟分析方法已成功地应用于小麦和铝合金中稀土总量的测定     

新显色剂—6硝基—苯并噻唑重氮氨基偶氮苯与汞的显色反应及其应用研究

研究了新显色试剂６－硝基－苯并噻唑重氮氨基偶氮苯与Ｈｇ（Ⅱ）的显色反应。在乳化剂ＯＰ存在下，于ｐＨ１０．０的缓冲溶液中，Ｈｇ（Ⅱ）与显色剂形成１：２的稳定红色络合物。络合物的λｍａｘ＝５１５ｎｍ，其表观摩尔吸光系数为１．５３×１０＾５Ｌ·ｍｏｌ＾－１·ｃｍ＾－１，Ｈｇ（Ⅱ）含量在０￣５μｇ／１０ｍＬ范围符合比尔定律，样品分析结果令人满意。     

Selective Rearrangement Reaction of Bicyclic Ketal Compounds in the New Reagent System,MgBr2-Ac2O-NaOAc

A new reagent system, MgBr₂-Ac₂O-NaOAc, was investigated for the selective rearrangement reaction of bicyclic ketal compounds. Mono- and diacetylated products were isolated in low yield using MgBr₂-Ac₂O system, but the single mono-acetylated isomer was obtained selectively by the addition of NaOAc in the reaction conditions.     

引发格氏试剂制备的一种新方法

制备格氏试剂关键在于开始的引发反应能否顺利进行。实验过程中往往由于卤代烃不太活泼;镁外层氧化物未除尽;试剂或装置中存有微量水使引发反应受阻。     

建立反应速率方程的新方法

对于有一定级数的反应,不论反应级数是几,建立反应速率方程时都可以用非线性拟合法来完成。该方法分为两步。第一步,初次对实验数据进行非线性拟合,从而得到反应级数;第二步,借助已得到的反应级数再次对实验数据进行非线性拟合,从而得到反应速率常数。与传统建立反应速率方程的方法相比较,非线性拟合法不仅简单易操作,而且处理结果准确、图线美观大方。     

A New Approach to the Asymmetric Reaction of the Chiron 5－L－Menthyloxy－2（5H）－furanones with Horner－Emmons Reagent

The asymmetric reaction of the chiron 2(5H )-furanones (4a-4c) with the Horner-Emmons reagents (5a-5b) has been investigated. The newly chirai organophosphorus derivatives 6 and 7 were obtained using the phosphoryl-stabilized carbanion as a building block in DMSO under mild conditions. Through the asymmetric introduction, the Horner-Emmons reagent could be transformed to a chiral building block to afford the novel functionalized phosphorus derivatives. The structures of the synthesized compounds 6 and 7 were identified on the basis of their elementary and spectroscopic data, such as IR,^1H NMR, ^13C NMR, MS and X-ray crystallography. These resuits provided a valuable approach to the synthesis of potentially interesting chirai organophosphorus derivatives and probing their biological activities.     

KG-60-Piperazine as a New Heterogeneous Catalyst for Gewald Three-Component Reaction

Piperazine supported on amorphous silica (KG-60-piperazine) as a basic catalyst acts in the Gewald three-component reaction of some aldehydes and ketones with malononitrile as well as ethyl cyanoacetate. The catalyst shows general utility with a variety of starting carbonyl compounds. Moreover, the catalyst can be reused for four additional cycles without significant loss of the activity.

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