Friedel-Crafts Polymers. 6. Friedel-Crafts Polycondensation of p-Xylylerte Dibromide with Salicylic Acid and β-Resorcyiic Acid

Polymers were prepared by condensing p-xylylene dibromide separately with salicylic acid and β-resorcylic acid in the presence of anhydrous ferric chloride in dioxane. The polymer samples_were characterized by elemental analysis, by IR spectral study, by M determined by vapor pressure osmometry, by nonaqueous conducto-metric titration in pyridine, by TGA in air, and by viscosity measurements of polymer solutions in DMF. Polymeric metal chelates of Cu²⁺, Co²⁺, Zn²⁺, Ni²⁺, and Fe³⁺ with polymer samples were prepared and characterized by elemental analysis, by IR spectral study, and by TGA in air. The chelation ion-exchange properties of the polymer samples were studied by employing the batch equilibration method.     

Friedel-Crafts Polymers. I. Self-Polycondensation of 4,4′-Dichloromethyldiphenyl Ether

Friedel-Crafts self-polycondensation of 4,4′-dichloromethyl-diphenyl ether (DDE) is studied under various experimental conditions. These polymer samples are infusible and are insoluble in all solvents. The polymer samples, PDs, are characterized by elemental analysis, IR spectral study, and by TGA. Polymer reaction products of one polymer sample are prepared by subjecting it to Friedel-Crafts reaction with excess benzene and by treating it with triethylamine. Both the polymer reaction products are found to be less stable than the parent polymer sample.     

催化不对称Friedel-Crafts反应

傅-克反应是有机化学中最基本的反应之一,但是对于催化的不对称傅-克反应的研究则处于起步阶段。最近这方面的研究获得了突破,本文简要介绍了催化不对称傅-克反应的最新动态,包括各种手性Lewis酸催化体系的开发及其在不对称合成中的应用。     

Friedel-Crafts Acylation of Ferrocene Catalyzed by Solid Superacid, Silica-supported Polytrifluoromethanesulfosiloxane

Solid superacid, silica-supported polytrifluoromethanesulfosiloxane (SiO2-Si-SCF3) was firstly used in the Friedel-Crafts acylation of ferrocene as a novel catalyst. IR spectra, WAXD and specific surface area of the superacid SiO2-Si-SCF3 were also investigated.     

Friedel-Crafts反应的发现史

介绍Ｆｒｉｅｄｅｌ和Ｃｒａｆｔｓ在进行Ｇｕｓｔａｖｓｏｎ反应的实验过程中如何发现了Ｚｉｎｃｋｅ反应的本质,从而创立了以无水三氯化铝等金属卤化物为催化剂的烷基化和酰基化反应。     

Friedel-Crafts Polymers. 10. Polycondensation of 4-4′-Dichloromethlydiphenyl Ether with Phenol and Isomeric Cresols

Friedel-Crafts polycondensations of 4, 4′-dichloromethyldiphenyl ether (DDE) with phenol and isomeric cresols were carried out under different experimental conditions. The molecular weight of the polymer products was estimated by end group analysis, that of soluble products by VPO, and they were characterized by TGA and solution viscosity. DMF solutions of samples prepared from phenol and p- and m-cresols, but not those from o-cresol, showed abnormal viscosity behavior. However, the viscosity behavior of DMF-water solutions was normal. Abnormal vis-cisoty data of DMF solutions were correlated by an empirical relation. Curing of one fusible and soluble DDE-phenol polymer sample with hexamine was studied by measuring the percentage of cured material as a function of time at selected temperatures.     

Friedel-Crafts酰基化反应研究进展

对Friedel-Crafts酰基化反应的最新研究进展按催化剂的类型分金属氯化、三氟甲磺酸盐、沸石、金属或非金属等四类进行了综述。     

微波辅助的Friedel-Crafts反应

Friedel-Crafts反应是有机合成中最有用的反应之一,它的应用范围十分广泛.利用微波辅助进行的Friedel-Crafts反应在有机合成方法学和新化合物合成的研究中逐渐受到广泛重视.本文综述了近年来微波辅助的Friedel-Crafts反应的研究进展和这类反应在新化合物合成中的应用.     

Solventless Friedel-Crafts Acylation under Microwave Activation

A novel catalytic system, ZnCl2 supported on alumina, was found to be an efficient and readily available medium for the solvent-free Friedel-Crafts acylation reactions under microwave irradiation. Good yields and high catalytic efficiencies were observed within short reaction times. Comparing with silica gel, alumina was more efficient under the same conditions.     

Catalyst- and halogen-free regioselective Friedel-Crafts α-ketoacylations

Fast, efficient and green! Highly regioselective and efficient catalyst- and halogen-free Friedel-Crafts α-ketoacylation reactions leading to heterocycles functionalized with a very versatile 1,3-diketone moiety are described. The reactions rely on microwave-assisted domino Wolff rearrangement/Friedel-Crafts sequences from 2-diazo-1,3-diketones via transient, highly reactive α-keto ketene intermediates.     

A review of: “Instrumental HPTLC,by W. Bertsch,S. Hara,R. E. Kaiser,and A. Zlatkis,editors, H. Verlag,Heidelberg, West Germany, 1980, 390 pp., cloth bound.”

Abstract

To understand the retention mechanisms involved in reversed-phase micelle chromatography, two models were examined to study the temperature and micelle concentration contribution to the retention process. the first model described the temperature contribution, using the van's Hoff equation, for each of the three equilibria: micelle-to-extra-micelle-mobile-phase, extra-micellar-mobile-phase-to-stationary phase and micelle-to-stationary phase. the second model described the temperature contribution on k' irrespective of the various equilibria involved. It was found that the enthalpy of retention obtained with the second model decreased with increasing micelle concentration. This contradicted a primary assumption in the first model that the equilibrium constants were independent of micelle concentration. No relationship was found between the enthalpy of retention evaluated with either model and the polarity of the partitioned solute molecules. A correlation was found between the entropy of retention and the polarity of these molecules. Fluorescence studies indicated that the micelle solvated molecules were probably located in the core of the micelles which contained other mobile phase components such as 1-propanol and water.     

Perrier改进法在Friedel-Crafts酰化反应中的应用

Friedel-Crafts酰化反应是有机合成中制取芳香酮,并由此转变为其他芳香化合物的良好方法.例如然而,芳烃,特别是烷基取代的芳烃,在催化剂(如无水AlCl_3)存在下,常常会发生烷基的转位、异构化、去氢、去(或双)烷基化以及芳烃的聚合等副反应,以致降低产物的纯度和产率.温度、溶剂、催化剂对此反应的影响已进行了较多的研究(参见文献[5]、