三氯化铁催化选择性合成普罗布考单丁二酸酯

研究了以三氯化铁为催化剂选择性合成普罗布考单丁二酸酯的反应.考察了催化剂、反应溶剂、碱、酰化剂及配料比对反应的影响.实验结果表明金属盐对反应的收率和单酰化反应的选择性有显著的影响,当以三氯化铁为催化剂,丁二酸酐为酰化剂,叔丁醇钠为碱,四氢呋喃为溶剂,普罗布考、叔丁醇钠、丁二酸酐及三氯化铁的摩尔比为1:4:5:0.17,...     

金纳米棒的生长及与FeCl_3的作用

采用三氯化铁选择性刻蚀法获得了预定长径比的金纳米棒.相比于晶种生长法,三氯化铁选择性刻蚀法可以更加简便快捷地调控金纳米棒形貌.以三氯化铁为刻蚀剂的刻蚀反应优先发生在金纳米棒尖端,这是因为金纳米棒尖端反应活性更高且表面活性剂钝化作用更弱.通过控制刻蚀反应时间及刻蚀剂浓度,可以精确调控金纳米棒的长径比.实验结果表明,增加刻蚀剂浓度、卤素离子浓度以及升高反应温度可以加快刻蚀反应速率.进一步讨论了金属离子的刻蚀作用机理.     

铁粉与氯气反应能生成二氯化铁吗?

从化学热力学基本原理出发,解释了在合适的反应温度下,铁粉与氯气反应生成三氯化铁的原因。并通过吉布斯-亥姆霍兹方程计算得出,在反应温度高于626 K时,铁粉与氯气反应将生成二氯化铁。这既体现了化学热力学对无机合成的指导意义,又可增强学生对化学热力学知识的理解和应用。     

β-CD与间羧基苯磺酰氯及Fe^3^+构筑氧化还原酶

用β-CD与间羧基苯磺酰氯及三氯化铁反应, 制得了双(6-氧-间羧基苯磺酰基)-β-CD.Fe^3^+配合物, 以此配合物作催化剂, 将苯甲醇高速率氧化成苯甲醛和苯甲酸, 其反应速率是三氯化铁的1.4×10^4倍。     

漆酚铁聚合物的制备及性能研究

以生漆和三氯化铁反应制备漆酚铁聚合物,用红外光谱、涂膜鲜映性仪和光泽度仪等对聚合物结构和漆膜性能进行表征.结果表明,反应温度65℃,反应时间3h,漆酚和三氯化铁物质的量比为8∶1,所生成的漆酚铁聚合物性能较好.     

室温下三氯化铁参与的新颖的分子内氧化偶联形成菲环的实际应用研究

将三氯化铁应用于Z或E-2,3-二取代苯基丙烯酸酯的分子内氧化偶联合成多甲氧基取代的菲衍生物,该反应在室温下以很高的产率得到偶联产物。使用廉价无毒的三氯化铁为氧化剂及温和的反应条件能方便快速地大量制备娃儿藤碱合成的重要中间体—多甲氧基取代的菲衍生物。     

氯化铁催化合成苯甲酸异丁酯

用氯化铁水合物催化苯甲酸与异丁醇的酯化反应，探讨了氯化铁催化合成苯甲酸异丁酯的反应条件。     

732树脂固载三氯化铁催化合成苯酚

报道了 732树脂固载三氯化铁催化合成苯酚 ,研究了反应温度、双氧水浓度、反应物投料比、反应时间和催化剂用量对反应的影响及催化剂的重复使用性能。     

氯化铁催化氯乙酸的酯化作用

报道了在氯化铁水合物存在下氯乙酸与不同醇的酯化反应，测定了部分酯的物理常数，结果表明，氯化铁对该反应的催化活性良好。     

三氯化铁催化的有机反应研究进展

应用FeCl3催化有机反应,已经成为有机合成中的一个重要方法.近年来一直是有机化学和催化化学的研究热点之一.按照反应类型的不同对近年来三氯化铁催化的有机反应研究进展进行了综述.     

Organic tellurium compounds—VIII Di-aryl tellurides as dehalogenation agents —the reduction of metallic salts by DI-p-tolyl telluride

The reaction of di-p-tolyltelluride with ferric, cupric and mercuric chloride, performed in glacial acetic acid, effects the reduction of the metallic salts giving rise to di-p-tolyltellurium dichloride. In toluene solution only the ferric chloride was reduced and the anhydride of di-p-tolyltellurium hydroxychloride formed, due to the hydrolysis of the tellurium dichloride. The reaction of the mentioned telluride and benzoyl chloride gave rise to a mixture of the dichloride and the dibenzoate. The mechanism of this reaction is discussed.     

Spectrophotometric evaluation of interferences in three iron reactions for the determination of serum total cholesterol

A spectrophotometric and chemical evaluation of reported interferences for three iron reactions for the determinations of serum cholesterol has been presented. It has been shown that all three reactions are affected by various interfering substances, such as 2-thiouracil, nitrate, azide, bromide, diethylstilbesterol, and steroids. Spectral differences between the reactions are probably due to solvent and anion effects.The incorporation of uranyl acetate as a precipitating agent into the ferric acetate-uranyl acetate procedure did not make the results obtained comparable with the Abell-type extract of a very icteric serum. Incorporation of ferrous sulfate does not noticeably affect the intensity or stability of color development with standards.As proposed, the ferric acetate-uranyl acetate procedure for the determination of cholesterol represents a modified iron reagent, but the reaction mechanism and the procedure described for it is neither new nor direct. The use of the ferric acetate reagent for serum cholesterol as opposed to ferric chloride, ferric ammonium chloride, or ferric perchlorate appears to have no real advantages as a color reaction. In fact the reaction is less sensitive while reagent preparation is more tedious, time consuming, and expensive than the ferric chloride procedure. Although no quantitative studies were performed, the only effects that chloride had on the reactions were in the region of 400 nm, a wavelength sufficiently far enough away from the 560-nm peak that it did not affect determinations. The concept that the ferric acetate-uranyl acetate reagent contains only acetate and sulfate anions is nullified as soon as one adds serum to the reagents.     

Thermal analysis of RDX with contaminants

Many investigations and researches studied the reaction ability between high explosive RDX and RDX with other chemicals. However, accidents still occur and operating problems exist among the RDX manufacturing process. This study utilized inherent safety concepts and DSC thermal analysis to assess the incompatible reaction hazards of RDX during usage, handling, storage, transporting and manufacturing. This assessment includes thermal curve observations and kinetic evaluations. A decomposition mechanism of the incompatible reaction is proposed. Among all the contaminants evaluated in this study, the existence of ferrous chloride tetrahydrate, ferric chloride hexahydrate and nitric acid shifted the main endothermic and exothermic reactions of RDX. These contaminants further advanced the exothermic temperature onset average by about 53, 46 and 61°C, respectively. The summarized results suggest that ferric oxide, ferrous chloride tetrahydrate, ferric chloride hexahydrate, acetone solution and nitric acid can influence the reaction and thermokinetic properties of RDX. These chemicals could induce potential hazards by causing temperature control instability, heating and cooling systems failure, and produce an unexpected secondary explosion. According to the conclusions of this study, potential incompatible RDX hazards during usage and manufacturing could be avoided.     

Sur la transformation du β-nitrostyrène sous l'action du chlorure d'acétyle en présence d'un chlorure métallique

While β-nitrostyrene yields only hydroxymic or hydroxamic acid derivatives by treatment with acetyl chloride in the presence of zinc, tin, titanium or aluminium chloride, it also gives 3-chloro 2-indolinone and a 5-acetyl derivative of the latter, when the reaction is carried out with ferric chloride. The procedures of this reaction are examined, and a mechanism is suggested.     

Electroinitiated cationic polymerization of styrene in the presence of ferric chloride

The electroinitiated polymerization of styrene has been studied in acetone with ferric chloride as the electrolyte. At a fixed monomer concentration, the polymer yield depends on the current strength as well as the concentration of ferric chloride. The molecular weight of the polymer lies in the range of 1000–3000. Addition of zinc chloride to the system or replacement of the solvent by DMF (partly or fully) or methanol retards the polymerization. The current exponent of polymerization is unity with a reaction rate constant of 4.416 × 10^?2 reaction percent per hour. The locus of polymerization is the anode compartment. A cationic mechanism has been proposed for the polymerization, the initiating step consisting of an electron transfer from an adsorbed charge transfer complex of styrene and ferric chloride.     

Increased rates of initiation of polymerization by 4-4′-dicyano-4-4′-azopentanoic acid in the presence of ferric salts

The initiation of the polymerization of acrylamide by 4-4′-dicyano-4-4′-azopentanoic acid in aqueous solution has been studied kinetically at 25°C. Ferric chloride and ferric sulfate were used to terminate polymerization so that rates of initiation could be calculated from the rates of production of ferrous iron. Velocity coefficients at 25°C. for the initiation reaction were found to be (25.7 ± 2.8) × 10^?7 sec.^?1 for the ferric chloride terminated reaction and (73.6 ± 0.6) × 10^?7 sec.^?1 for the ferric sulfate-terminated polymerization. The value reported for the initiation reaction when acrylamide is polymerized in the absence of metal salts is 1.29 × 10^?7 sec.^?1. Velocity coefficients for the termination reaction have been calculated from the overall rates of polymerization obtained with ferric salts present. In the case of the ferric chloride-terminated reaction, it has been shown that the rate of polymerization is reduced by increasing the total concentration of chloride ions. Termination velocity coefficients at 25°C. for the inner sphere complexes FeCl²⁺·5H₂O and FeSO₄⁺·4H₂O have been calculated to be 18.9 × 10⁴ and 7.98 × 10⁴ l./mole-sec., respectively. The dependence on the concentration of ferric chloride of the molecular weights of the polymers produced has also been considered.     

Polymerization of diphenylamine with friedel-crafts/oxidation catalysts to produce thermally stable polymers

The synthesis of polymers from diphenylamine by use of ferric chloride and aluminum chloride–cupric chloride catalyst–oxidant systems has been studied. Optimum conditions for yield and thermal stability were determined for the aluminum chloride–cupric chloride systems. Thermal stabilities in air were between 450 and 500°C. Infrared and ultraviolet spectra indicate that reaction has taken place by direct nuclear coupling.     

Reaction between alcohols and alkyl isocyanates catalyzed by the light-sensitive ferrocene-ferric chloride system.

Kinetic, spectroscopic and quantum yield measurements allow insight into the mechanism of the reaction between t-butyl isocyanate and methanol photosctalyzed by ferrocene and ferric chloride.     

超支化聚硅氧基硅烷的合成及其表征

基于线性聚硅氧烷在国防、能源和化工等领域的广泛应用,具有新颖拓扑结构和大量功能性端基的超支化聚硅氧烷引起了国内外科学工作者的广泛兴趣[1~7].到目前为止,主要是采用水解缩聚的方法合成超支化单体,在铂系催化剂存在下进行硅氢加成反应或者在碱催化剂存在下进行质子转移聚合制备超支化聚合物[8~12].然而,以上合成超支化聚硅氧烷的方法仍然存在一定的不足.例如,水解法步骤繁琐,通常在第一步反应结束后需要多次除水,并继续滴加单氯硅烷以得到完全取代的大单体;同时多官能度单体容易水解自缩聚,产生A2B4或A3B6等副产物,不仅不利于结构控…