The Chemistry of α-Carbonyl Azo Compounds

α-Carbonyl azo compounds such as diesters of azodicarboxylic acids, diacylazo compounds, and esters of arylazocarboxylic acids are highly reactive. They add e.g. to amines, aromatic compounds, olefins, CH acids, Grignard and diazo compounds, aldehydes, ketones, and ketenes. These reactions can be used for the preparation of triazanes, hydrazones, oxa-diazoline, azomethinimine, and diazetidine derivatives, etc. α,α′-Dicarbonyl azo compounds are among the strongest dienophiles known.     

Reductive Cleavage of Azo Compounds by Zinc and Ammonium Chloride

Abstract

Azo compounds are reduced to corresponding anilines with zinc dust in the presence of ammonium chloride in methanol at room temperature.     

Synthesis, Metal Complexation and Spectroscopic Characterization of Three New Azo Compounds

The synthesis of azo compounds [4-(N'-2-thiazol-2-ylsulfanyl)-4'-hydroxyazo benzene (1), 4-(N'-2-thiazol-2-ylsulfanyl)-2'-hydroxy-5-tert-butylazobenzene (2), 7-[4-(N'-2-thiazol-2-ylsulfanyl)phenylazo-8-hydroxy quinoline (3)] have been carried out by reacting phenol, 4-tert-butyl phenol and 8-hydroxy quinoline with N'-2-thiazol-2-ylsulfanylamide as coupling component. The resulting ligands (2 and 3) were treated with two transition metal salts (e.g., CuCl₂2H₂O andNiCl₂6H₂O). Cu(II) and Ni(II) complexes of the azo derivative ofphenol were obtained and characterised by IR, UV-Vis, ¹H NMR, spectroscopic and elemental analysis techniques. All the complexes have a metal : ligand ratio of 1 : 2 and are square-planar.     

油溶性偶氮染料的合成及其性能研究

随着染料在现代科技中的广泛应用,染料的油溶性也日益受到人们的重视.如:非线性光学材料、激光盘光学信息存贮材料中使用的染料、彩色成像中的油溶性影像染料等,对染料在有机溶剂中的溶解度都有很高的要求.偶氮染料是有机染料中的主要类型,但目前对其分子结构与油溶性关系的研究甚少.本文合成了一类黄色偶氮染料(见表1),并对其色光、油溶性等性能进行了测试,发现取代基相对于偶氮基的位置,是影响偶氮染料油溶性的主要因素.     

A Convenient Solid State Method for Preparing Aryl Azo Compounds

A convenient solid state reaction using ferric nitrate to oxidize substituted semicarbazide for preparing azo ureas has been reported for the first time. Eight phenyldiazenecarboxylic acid anilide derivatives, have been synthesized in excellent yields with cheap reagents and simple instruments under room temperature.     

Study on the Reductive Acylation of Azo Compounds by SmI2/THF in One Pot

Azobenzene compounds without big substituents were conveniently reduced by a system consisting of SmI₂/THF and successively reacted smoothly with analogous aliphatic acyl chlorides or acid anhydrides to afford corresponding mono‐acyl symmetrical hydrazobenzene under mild and neutral conditions in one pot; while other azo compounds reacted under similar conditions, amides were the terminate products.     

Electrochemical Behavior of Azo Compounds in Liquid Ammonia

Abstract

At -40°C, the behavior of lO compounds, differing widely in their standard potentials, has been investigated in liquid ammonia, using cyclic voltammetry at a smooth platinum electrode. The purpose of this study was the realization of a redox scale with reversible systems. With azobenzene, pyridazine, cin-noline, benzocinnoline and 4,4′-azobis-(pyridine-N-oxide), the first electron transfer is reversible and leads to the formation of the corresponding radical anions which are stable; the second electron transferleads to the ciianions which can be protonated yielding the corresponding hydrazo. Other compounds, such as azoxybenzene, 3-amino-1,2,4-triazine, pyridine-N-oxide, 8-azaadenine and 1H-tetrazole, have an electrochemical behavior which i s more intricate.     

Azo compounds for free radical crosslinking of polysiloxane stationary phases

There has been much effort spent in recent years developing the technology for free radical crosslinking of polysiloxane polymers to prepare capillary columns coated with thermally stable and nonextractable stationary phases. Organic peroxides have been used extensively as the free radical initiators for the in situ polymerization of the stationary phases. However, these peroxides adversely affect the phase polarity and column activity. Seven azo compounds were studied for crosslinking efficiency. Azo compounds can be used as free radical initiators to prepare nonextractable stationary phases without the adverse effects caused by peroxides.     

偶氮染料在酸性介质中的电还原性质

研究了4个偶氮染料在酸性介质中的电还原性质。偶氮基在酸性介质中的还原均为不可逆四电子一步全还原。邻、对位上有吸电子基(如—CO_2Bu-n)的偶氮基较间位有吸电子基时更易被还原。分子中同时含有偶氮基和硝基时,偶氮基先被还原。     

Organomercury Compounds in Organic Synthesis

Organomercurials have been known since 1850 and many synthetic routes to these compounds presently exist. The ability of these compounds to accommodate a wide variety of functional groups and to tolerate quite diverse reaction conditions makes them attractive as synthetic intermediates. While the solvomercuration-demercuration and divalent carbon transfer reactions remain the most widely used of the organomercurial reactions, a number of new synthetic procedures employing organomercurials have been developed in recent years. Many of these involve transmetallation reactions with palladium salts.     

含偶氮生色团的“倒浮萍”聚合物LB膜及其可逆光信息存储特性

含偶氮苯功能基团的聚合物在光电子器件研制中具有诱人的应用前景．Wendorff[1]利用偶氮液晶聚合物首次实现可逆的光学信息存储后，利用偶氮苯分子的激光诱导二向色性和双折射效应实现可逆光学信息存储引起人们极大的兴趣．与传统的利用偶氮苯的顺反异构体实现信息存储的方式相比，这种信息存储方式由于偶氯苯分子始终处于热力学稳定的反式构象，因而具有突出的长期稳定性，具有更广阔的应用前景[1,2]．本工作设计合成了以含有给受体的偶氮苯分子为接枝侧链的两亲性聚合物，并研究了其成膜特性与可逆光信息存储特性．1实验部分两亲性聚合物…     

蒙脱石-有机化合物的相互作用

综述了蒙脱石与有机物的相互作用,包括蒙脱石对有机化合物的分配吸附现象及原理;蒙脱石与有机阳离子的离子交换反应;蒙脱石与芳香性化合物的三种吸附的相互作用形式以及这种反应在环境保护方面的应用。     

Acid/Base Properties and Adsorption of an Azo Dye on Coating Pigments

Adsorption of an anionic disazo dye, Food Black 2 on coating pigments from polar solvents was studied. Pigments (kaolin, precipitated CaCO₃, amorphous SiO₂, TiO₂, Al₂O₃, and talc) were chosen to be representative of those used in paper for ink‐jet printing. The predominating driving force for the adsorption was electrostatic interactions for all the pigments except talc, for which hydrophobic interactions were dominant. Lewis acid‐base properties of the pigments were studied by measuring adsorption of Lewis acid‐probe molecules from both polar and nonpolar media. The pigments studied were found to be amphoteric, containing both acidic and basic surface groups. However, in the presence of polar solvents, the adsorption of acid‐base probe molecules was greatly reduced, which indicates that Lewis acid‐base interactions have only a small influence on the adsorption of azo dyes from polar media such as water.     

Sulfonyl Hydrazones of Cyclic Amides and Quaternary Azo Sulfones of Heterocycles as Reagents in Azo Chemistry

Sulfonyl hydrazones of cyclic amides undergo oxidative coupling with phenols and reactive methylene components. The reaction proceeds via the azo sulfones, which may be used as such, and which, as ambident cations, enter into many reactions with nucleophiles and extend the scope of oxidative coupling. The reaction with phenols is a two-step process, in which the limiting cases k₁ ? k₂, k₁ ≈ k₂, and k₁ ? k₂ can be realized by slight variation of the reactants.     

偶氮蓝分光光度法测定硫酸卡那霉素

在pH 4.10的B-R缓冲溶液中,偶氮蓝与硫酸卡那霉素相互作用生成离子缔合物导致偶氮蓝色泽减褪,或换言之,当在偶氮蓝溶液中加入硫酸卡那霉素后,在偶氮蓝的吸收峰552 nm波长处吸光度降低,吸光度差值与硫酸卡那霉素浓度成正比,最佳条件下,硫酸卡那霉素的质量浓度在0.1～4.0 mg·L-1范围内遵守比耳定律,表观摩尔吸光率ε=7.3×104L·mol-1·cm-1,检出限(3σ)为7.6×10-2mg·L-1.将方法应用于硫酸卡那霉素注射液试样中卡那霉素的测定,测定结果的RSD(n=7)值为1.1%,按标准加入法测得的平均回收率为96.5%.     

Metal complexes of azo compounds derived from 4-acetamidophenol and substituted aniline

The Ni(II) and Cu(II) complexes of four azo compounds (H₂L^1–4), namely, 2-(p-X-phenylazo)-4-acetamidophenol (X = OCH₃, NO₂, Br, and H for H₂L¹, H₂L², H₂L³, and H₂L⁴, respectively) were prepared and characterized on the basis of their analytical, spectroscopic, magnetic, and conductance data. The isolated complexes are found to have the general formulae [M(HL^1–4)Cl(H₂O)₃] (M = Ni(II) and Cu(II)). The chelates are found to have octahedral structure. The infrared spectra show that H₂L^1–4 ligands are coordinated to the metal ions in a uninegative bidentate manner, with NO donor sites of the azo N and the deprotonated phenolic O. The ligands and their chelates are subjected to thermal analysis. The biological activity of the synthesized ligands and their metal complexes also are screened against the adult Tribolium confusum mortality. They showed remarkable biological activity.     

1,2,4‐Triazole Links and N‐Azo Bridges Yield Energetic Compounds

Triazole links and polynitropyrazole rings give rise to compounds with energetic properties. These materials were fully characterized by NMR and infrared spectroscopy, elemental analysis, and differential scanning calorimetry (DSC). In addition, the structures of compounds 5 and 8 were confirmed by single‐crystal X‐ray diffraction analysis. Detonation properties, calculated from heats of formation and experimental densities, thermal stabilities, and impact and friction sensitivities support the potential use of these materials for explosive applications.     

Syntheses，Structures and Spectroscopic Properties of Mo（W）－Cu－S－Cluster Compounds with Dialkyldithiocarbamate Ligands

Ｓｙｎｔｈｅｓｅｓ，ＳｔｒｕｃｔｕｒｅｓａｎｄＳｐｅｃｔｒｏｓｃｏｐｉｃＰｒｏｐｅｒｔｉｅｓｏｆＭｏ（Ｗ）－Ｃｕ－Ｓ－ＣｌｕｓｔｅｒＣｏｍｐｏｕｎｄｓｗｉｔｈＤｉａｌｋｙｌｄｉｔｈｉｏｃａｒｂａｍａｔｅＬｉｇａｎｄｓＣａｏＲｏｎｇ；ＬｅｉＸｉｎ－Ｊｉ...