Facile synthesis of indene and fluorene derivatives through AlCl3‐catalyzed cyclization of in situ formed iminium ions

A simple AlCl₃‐catalyzed condensation/cyclization cascade process between aldehydes and sulfonamide is reported, in which two new bonds and one five‐membered ring are simultaneously formed with water as the byproduct. This method provides a rapid access to indenamine and 9‐aminofluorene derivatives. Additionally, these products can be transformed into corresponding indanones and fluorenones under the developed conditions.     

Die Reaktion von AlCl mit H2O in festem Argon: IR‐matrixspektroskopischer Nachweis von HAl(Cl)OH

The Reaction of AlCl with H₂O in Solid Argon: IR Matrixspectroscopic Detection of HAl(Cl)OH After photolytical activation of AlCl and H₂O in solid argon the molecule HAl(Cl)OH is formed. Structure and bonding is characterized by means of normal coordinate analysis and quantum chemical calculations. The complex AlCl···H₂O formed directly after condensation serves as a model system for the stabilisation of aluminium monohalide in a mixture of toluene and ether.     

石墨烯吸附Al2Cl6分子的第一性原理与Monte Carlo研究

采用第一性原理与蒙特卡罗方法研究Al₂Cl₆气体分子在石墨烯表面的吸附性能与光电性质，结果表明：(1)石墨烯对Al₂Cl₆气体分子具有较强的物理吸附作用，两个Al原子的连线与石墨烯平面近乎平行且两个Al原子处于紧靠顶位的桥位位置时最稳定；(2)温度升高不利于Al₂Cl₆气体分子吸附并存在阶跃式降低，气体逸度增加有利于吸附并存在阶跃式升高，Al₂Cl₆气体分子插入石墨/双层石墨烯/多层石墨烯宜将温度维持在AlCl₃沸点附近，并增加气体的压力；(3)Al₂Cl₆的吸附对石墨烯的电子结构进行了调控，但没有明显改变石墨烯费米能级附近的态密度以及“赝能隙”;(4)Al₂Cl₆的吸附对体系光学参数的影响十分明显，静态介电常数提高近5倍，使体系屏蔽效应有较大增强，在长波波段的吸收性能、反射性能及光电导也有了明显提升.     

Ultrasound‐Assisted One‐Pot Synthesis of Octahydroquinazolinone Derivatives Catalyzed by Acidic Ionic Liquid [Tbmim]Cl2/AlCl3

Acidic ionic liquid [tbmim]Cl₂/AlCl₃ catalysed an efficient synthesis of octahydroquinazolinone derivatives under ultrasound‐irradiation. This method provides several advantages such as environment benign, high yields and simple work‐up procedure.     

盐对粘土／氢氧化铝镁／甘油胶体性能的影响

通过电泳淌度、流变参数和中压滤失量的测定，研究了ＫＣｌ和ＡｌＣｌ３对带永久负电荷的蒙脱土与带永久正电荷的氢氧化铝镁／甘油形成的混合悬浮体胶体性能的影响，并对影响机理进行了深入探讨     

Role of added Lewis base and alkylaluminum halide on living cationic polymerization of vinyl ether

In the living cationic polymerization of isobutyl vinyl ether (IBVE) by the CH₃CH (OiBu) OCOCH₃ ( 1 )/EtAlCl₂ initiating system in the presence of the added base in hexane at +40°C, the stability of the initiating system 1 /EtAlCl₂, which form initiating species CH₃CH^⊕ (OiBu) derived from 1 , was investigated. In the presence of the Lewis base such as ethyl acetate or 1,4-dioxane, the active species was stable for 300 min even at +40°C in the absence of IBVE, and the living polymers were quantitatively obtained by adding IBVE. However, the active species was partly consumed by side reactions during the standing time for 60 min in the presence of a less basic additive such as ethyl benzoate, and about 50% of the active species was deactivated in the presence of methyl chloroacetate. Consequently, in the case of a less basic additive such as methyl chloroacetate (which was effective for the fast living polymerization), it can be seen that the careful selection of polymerization conditions was required. The living polymerization rate was dependent on the second order of EtAlCl₂ concentration. EtAlCl₂ induced the cleavage of 1 into CH₃CH^⊕ (OiBu) and EtAl^?Cl₂(OCOCH₃), and the reactivity of CH₃CH^⊕ (OiBu) and propagating carbocation may be controlled by EtAl^?Cl₂(OCOCH₃) with the aid of other EtAlCl₂. Et_1.5AlCl_1.5 exists as a bimetallic complex of EtAlCl₂ and Et₂AlCl, and it is expected that the polymers having a bimodal molecular weight distribution will be obtained due to two kinds of counteranions coming from EtAlCl₂ and Et₂AlCl. However, in the cationic polymerization of IBVE by 1 /Et_1.5AlCl_1.5 in the presence of ethyl acetate, the living polymer exhibiting a unimodal and very narrow molecular weight distribution was obtained. Thereby, it was suggested that the counteranions, EtAl^?Cl₂(OCOCH₃) and Et₂Al^?Cl(OCOCH₃), exchange rapidly with each other. © 1994 John Wiley & Sons, Inc.     

CATIONIC POLYMERIZATION OF 1, 3—PENTADIENE INITIATED BY ORGANIC AZIDE/Et2AlCl

The cationic polymerization of 1, 3-pentadiene was initiated by the organic azide/Et_2 AlClinitiating system in CH_2Cl_2 and n-hexane. The polymerizations were also carried out in parallelwith organic chloride/Et_2AlCl and Et_2 AlCl alone for comparison. The Et_2 AlCl- induced polymer-ization gives a low yield while the polymerization initiated by organic chloride/Et_2 AlCl producesmainly insoluble product. In contrast, the polymerization with azide/Et,AlCl has a high conver-sion and the resulting polymer having a high molecular weight is totally soluble. The SEC spectraof the polymers have clearly shown the differences between these initiating systems.     

Highly active and stable immobilized aluminium chloride catalyst for alkylation of benzene with 1-dodecene

Summary An AlCl₃ catalyst immobilized on<span lang=EN-US style='font-family:Symbol;mso-bidi-font-family: Symbol;mso-ansi-language:EN-US'>g-Al₂O₃with meso- and macro-pore bimodal structure was prepared and studied in the alkylation of benzene with 1-dodecene in a suspension bed reactor. The catalyst exhibited high activity, selectivity and stability during 1000 h running, with a 1-dodecene conversion of more than 95%, monoalkylbenzene selectivity of 92%, and 2-phenyldodecane (2-Ph) selectivity of nearly 42%.</o:p>     

The Reaction Between Diphenyliodonium Iodide and Disulfides in the Presence of a Zn/AlCl3 System: A Convenient Method for the Synthesis of Organic Sulfides

Abstract

A convenient method for the synthesis of alkyl aryl- and diaryl sulfides by the reaction of diphenyliodonium iodide and disulfides in the presence of Zn/AlCl ₃ system in acetonitrile is reported.     

油橄榄叶中总黄酮含量测定方法探讨

建立以芦丁为对照品的油橄榄叶中总黄酮含量的测定方法。采用Al(NO3)3-NaNO2-NaOH和AlCl3两种显色法测定油橄榄叶中总黄酮的含量,并分别考察了两种方法对测定结果的影响。结果表明,AlCl3显色法适宜于油橄榄叶总黄酮的含量测定。该法操作简便,线性关系良好,准确度、重复性和稳定性较好,可用于油橄榄叶总黄酮含量测定,并为中药和天然产物中总黄酮的含量测定提供参考。