The chemical transformation of CO2 and epoxides into cyclic carbonates has been receiving much attention is one the successful examples for utilization as carbon resource. Many catalysts containing halide anions have explored exhibit excellent catalytic activity. However, halogen salt generally toxic corrosive to reactors. From a green chemistry perspective, it more attractive develop halogen-free catalyst with performance. Herein, review recent research progress in cycloaddition epoxide...

Bifunctional organocatalysts bearing diamine and carboxylic acid groups efficiently catalyze the coupling reaction of CO₂ with epoxides under halogen-free conditions due to a synergy effect.

The phases of ceria–zirconia nanoparticles observed in air are studied as a function particle size and composition by X‐ray diffraction, transmission electron microscopy, Raman spectroscopy. emergence two tetragonal t ″ monotonically moves toward higher zirconia concentrations with decreasing size. A smaller increases the solubility cubic ceria, while content ceria stabilizes against coarsening. In particular, Ce 1− x Zr O 2− y is persistent 8% phase amount even at 90% 33 nm crystal Neither...

A Co-catalyzed reaction for the construction of 1,4-dicarbonyls has been reported in which cascade organocobalt addition/trapping/Kornblum-DeLaMare rearrangement were involved. In view easy availability starting materials, wide substrate scope, high functionality tolerance, and operational simplicity, this protocol constituted a simple, practical, powerful alternative compared with previous approaches.

By grafting butyl or ethyl onto tetramethylethylenediamine, quaternary ammonium salts with two positive charge centers were formed at the first step. Metathesis Ag(2)O followed. Through neutralization glycine, l-alanine, valine, a series of new ditetraalkylammonium amino acid ionic liquids (DILs) for CO(2) capture generated. The structures DILs, as shown in Figure 1, verified by using (1)H NMR and EA. These DILs found to be quite high viscosity which militated against their industrial...

A practical Brønsted acid promoted benzylic C–H functionalization of 2-alkylazaarenes and nucleophilic addition to nitroso compounds was developed under mild conditions. Switched by acids, this method can afford azaarene-2-aldimines, azaarene-2-carbaldehyde, or azaarene-2-oximes selectively. No metal, base, oxidant, other additives were required.

A copper-catalyzed aminosulfonylation of aryldiazonium tetrafluoroborates, DABCO·(SO2)2, and N-chloroamines is described. This coupling reaction provides an efficient simple approach to a wide range sulfonamides in moderate good yields under mild conditions. Mechanistic investigation suggests that radical process transition-metal catalysis are merged this tandem reaction.

A convenient metal-free cascade oxidative decarbonylative alkylarylation of acrylamides with aliphatic aldehydes to provide quaternary oxindoles is developed.

A four-component reaction of 2-vinylbenzoic acids, aryldiazonium tetrafluoroborates, the sulfur dioxide surrogate DABCO·(SO2)2, and nitriles under photocatalysis in presence visible light is developed. This multicomponent works efficiently, promoted by BF3·OEt2 with insertion mild conditions, leading to sulfonated 1-isoindolinones moderate good yields. route highly selective, several competitive pathways are not observed these conditions. possible mechanism involving a Lewis acid proposed.

A three-component procedure for the preparation of 2-substituted benzothiazoles from nitroarenes, alcohols, and sulfur powder is described. The reaction showed a good functional group tolerance to provide heterocyclic products in moderate yields. sequential assembly involving nitro reduction, C–N condensation, C–S bond formation has been realized one pot.

An anion-exchange strategy was used to prepare two helical structures made up of cucurbituril and asymmetric copper(II) complexes containing 8-hydroxyquinoline-5-sulfonate 3,5-diiodosalicylate (right half picture) or 3-iodobenzoate (left half). The shape-matching interactions between the copper were assisted by iodo substituents. Iodine has long been paid considerable attention for its fascinating chemical behavior1, 2 biological essentiality.3 use iodine as electrical conductor in synthesis...

A three-component cascade bis-heteroannulation reaction is described that provides access to a variety of benzo[4,5]thieno[3,2-c]isoquinoline and thieno[3,2-c]isoquinoline compounds from easily available methylketoximes, o-halobenzaldehydes, elemental sulfur. Mechanistic studies reveal two-step process involving sequential copper sulfur catalysis relay.

With the catalytic induction of ethylene glycol (EG), anhydrous N,N-dimethylethanolamine (DMEA) shows CO2 absorption performance via chemical binding and physical storage under normal pressure. Among absorbents, pure DMEA EG can hardly absorb directly, but when zwitterionic alkylcarbonates are formed between DMEA-EG, which be characterized by 13C NMR FTIR spectroscopy, rate is improved. increase in loading as mass fraction DMEA–EG, 80 wt % captures up to 0.72 mol/mol at 293 K 101 kPa...

Abstract Carbanion‐based ionic liquids are proposed and utilized as the key components for construction of five super‐nucleophilic deep eutectic solvents (SNDESs) in paper. The nature carbanion‐based (ILs) is found to enable capture CO 2 with large absorption capacity. However, very slow IL due high viscosity. synergy carbanion siting hydrogen bonding fast [N 2222 ][CH(CN) ]‐ethylimidazole (Eim), a synergistic mechanism validated from spectroscopic analyses quantum calculations. enthalpy...