Dearomatization of Indole Derivatives via Palladium‐Catalyzed C?H Bond Functionalization of Pyrroles: Convenient Construction of Spiroindolenines

An intramolecular palladium(II)‐catalyzed dearomative arylation reaction of indoles via C H bond functionalization was developed, providing access to structurally novel spiroindolenines with moderate to good yields. A one‐pot process for the synthesis of spiroindoline derivatives was also realized.

     

Simple N‐Heterocyclic Carbenes as Ligands in Ullmann‐Type Ether and Thioether Formations

A simple N‐heterocyclic carbene (NHC) derived from 1‐methyl‐3‐ethylimidazolium tetrafluoroborate was found to be an efficient ligand for a range of copper‐catalyzed cross‐coupling reactions, leading to the formation of aromatic ethers and thioethers.

     

炭载Cu(Ⅲ)固定床吸附催化氧化处理含酚污水

活性炭对含酚污水中影响COD值的微量有机污染物具有吸附作用,将其活化处理后,用Cu(NO3)2溶液浸渍,并在烘箱中将铜还原热固在其微表面上,采用固定床式装置,利用活性炭的吸附和铜的催化作用,降低有机污染物分解的活化能并实现酚类的深度降解及达标排放.结合F en ton反应机理,实验探讨了Cu2 非均相催化氧化机理.该方法集吸附、催化氧化和过滤于一体,为湿法催化处理污水的工程化提供了可能.     

合成条件对邻甲酚系线形酚醛树脂的影响

采用双层反应设备,通过碱酸分步催化法合成了一系列纯邻甲酚和以邻甲酚为主成分的邻甲酚系线形酚醛树脂。利用GPC、NMR等研究了催化剂氢氧化钠的用量、醛酚比以及酚的种类和用量对树脂的分子质量(Mw)、分子质量分布(Mw/Mn)及抗碱性等的影响。结果表明,氢氧化钠用量达到酚总质量的0.4%、醛酚比接近于1时可合成分子质量高、分子质量分布窄的树脂。可利用醛酚比控制树脂的分子质量,可通过调整酚的种类和用量控制树脂的双邻位缩聚值(Ro-o)以及酚醛树脂的质量与其所含酚羟基质量之比值。合成的树脂可用于PS版、热敏CTP版以及LCD用抗蚀剂等。     

Self‐Catalyzed Growth of Co,N‐Codoped CNTs on Carbon‐Encased CoSx Surface: A Noble‐Metal‐Free Bifunctional Oxygen Electrocatalyst for Flexible Solid Zn–Air Batteries

The self‐catalyzed growth of nanostructures on material surfaces is one of the most time‐ and cost‐effective ways to design multifunctional catalysts for a wide range of applications. Herein, the use of this technique to develop a multicomponent composite catalyst with CoS_x core encapsulated in an ultrathin porous carbon shell entangled with Co, N‐codoped carbon nanotubes is reported. The as‐prepared catalyst has a superior catalytic activity for oxygen evolution and oxygen reduction reactions, an ultralow potential gap of 0.74 V, and outstanding durability, surpassing most previous reports. Such superiority is ascribed, in part, to the unique 3D electrode architecture of the composite, which is favorable for transporting oxygen species and electrons and creates a synergy between the components with different functionalities. Moreover, the flexible solid Zn–air battery assembled with such an air electrode shows a steady discharge voltage plateau of 1.25 V and a round‐trip efficiency of 70% at 1 mA cm^?2. This work presents a simple strategy to design highly efficient bifunctional oxygen electrocatalysts and may pave the way for the practical application of these materials in many energy conversion/storage devices.     

含哌啶阳离子侧长链型一/二价阴离子选择性分离膜的制备

基于超酸催化聚合机理制备了含咔唑片段的聚合物主链结构,并通过调控季铵化反应中N-甲基哌啶单体的用量,得到了不同哌啶离子含量的阴离子选择性分离膜。通过核磁共振氢谱证明了聚合反应和季铵化反应顺利进行。热重和动态机械分析的测试结果表明膜具有优异的热稳定性和力学性能。通过电渗析 （ED） 测试膜的阴离子分离性能,结果显示离子通量和选择性均优于商业膜Neosepta ACS。在NaCl/Na₂SO₄体系中,QPC-Pip-60的Cl^-通量可达3.24 mol·m^-2·h^-1,选择性可达11.6。在NaOH/Na₂WO₄碱回收体系下,良好的微相分离结构使得OH^-通量可达3.59 mol·m^-2·h^-1,选择性最高为70。长时间稳定性测试和碱稳定性测试结果表明所制备的系列膜具有优异的循环稳定性和耐碱性能。     

One‐Pot Synthesis of Triazoloquinazolinones via Copper‐ Catalyzed Tandem Click and Intramolecular C?H Amidation

A novel and highly efficient copper‐catalyzed tandem synthesis of triazoloquinazolinones is explored. The synthetic strategy involves a sequential one‐pot click reaction followed by aerobic intramolecular C H amidation. Two distinct and important transformations were carried out in one‐pot by employing a single cost‐effective copper catalyst. The milder, rapid and ligand‐free reaction conditions as well as a broader substrate scope are the salient features of this novel protocol.

     

Asymmetric Synthesis of Bioxindole‐Substituted Hexahydrofuro[2,3‐b]furans via Hydroquinine Anthraquinone‐1,4‐diyl Diether‐Catalyzed Domino Annulation of Acylidenoxindoles/Isatins,Acylidenoxindoles and Allenoates

Hydroquinine anthraquinone‐1,4‐diyl diether [(DHQ)₂AQN]‐catalyzed unprecedented asymmetric domino annulation reactions of acylidenoxindoles/isatins, acylidenoxindoles and allenoates are disclosed in this communication, providing a facile access to hexahydrofuro[2,3‐b]furans containing four contiguous chiral centers in good to excellent yields along with good to excellent ee values and moderate to good dr values. Based on theoretical investigations, a concerted [3+2] ring‐closure process was proposed, in which steric hindrance and π–π stacking interaction between catalyst and substrate subtly co‐control the diastereoselectivity of the reaction.