Recent advances of mixed-transition-metal-substituted polyoxometalates

Polyoxometalates(POMs) have been emerging as one of the most widely-studied interdisciplinary research fields of inorganic chemistry due to their structural diversities and versatile physicochemical properties. The incorporation of transition metals into lacunary POM ligands can lead to the formation of various transition-metal-substituted POMs(TMSPs) with wide potential applications in research areas including medicine, magnetism, functional materials, catalysis, and energy storage. In this rev...     

Recent advances in CAN mediated reactions in organic synthesis

The emergence of CAN as a versatile one-electron oxidant is attested by the wide range of reactions that can be executed by this reagent. The literature on CAN chemistry is updated in the present review while highlighting the reactions that make CAN an exceptional reagent.     

Recent advances in liquid-phase organic reactions using heteropolyacid and clay

ecent advances in liquid-phase organic reactions over solid acids are described based on the catalyses of acidic clays and silica-included heteropoly compounds. Zinc ion-exchanged smectite clays, particularly nontronite clays, were effectively applied as insoluble, readily recoverable solid acid catalysts to liquid-phase Friedel-Crafts reactions. Montmorillonite K10 catalyzes the synthesis of alkylporphyrin derivatives from aliphatic aldehydes and pyrroles more efficiently than the conventional homogeneous acids such as BF3 etherate. 12-Tungstophosphoric acid and its acidic Cs salt could be included in a silica matrix by means of sol-gel technique involving hydrolysis of ethyl orthosilicate forming insoluble and easily separable solid acid catalysts. These silica-included heteropoly compounds were thermally more stable than an ion-exchange resin catalyst such as Amberlyst-15, and catalyzed the hydrolysis of ethyl acetate in the liquid phase more efficiently than the resin, H-ZSM-5 and even than aqueous heteropolyacid.     

金属锌在有机合成反应中的应用

综述了近年来以金属锌作为还原剂的各种反应，以及它在有机合成中的应用。 讨论了金属锌在催化剂的作用下，还原碳碳、碳氮、碳氧重键及碳氧、碳硫、碳卤 等单键的还原和偶联。     

氯化铵催化有机合成反应的研究进展

廉价易得且对环境友好无毒的氯化铵作为Lewis酸催化剂,表现出较高的催化活性,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.本文按照反应类型的不同对近年来氯化铵催化的有机反应研究进展进行了综述.     

Radical reactions of aryl alkynoates in organic synthesis: Recent advances

Aryl alkynoate is an important intermediate and powerful synthetic tool in organic chemistry, because it contains acetylene bond which can be easily introduced of different functional groups. During the past decades, several types of reactions and coupling partners have been developed for the functionalization of aryl alkynoates. In this review, we summarize the recent advances on the reactions of aryl alkynoates, including direct cyclization, ester group migration/cyclization, aryl migration/decarboxylation, ipsocyclization/dearomatization, and other reactions in the past decade.     

Recent advances in Sonogashira reactions

The coupling of aryl or vinyl halides with terminal acetylenes catalysed by palladium and other transition metals, commonly termed as Sonogashira cross-coupling reaction, is one of the most important and widely used sp(2)-sp carbon-carbon bond formation reactions in organic synthesis, frequently employed in the synthesis of natural products, biologically active molecules, heterocycles, molecular electronics, dendrimers and conjugated polymers or nanostructures. This critical review focuses on developments in the Sonogashira reaction achieved in recent years concerning catalysts, reaction conditions and substrates (352 references).     

Recent advances in solventless organic reactions: towards benign synthesis with remarkable versatility

A paradigm shift away from using solvents in organic synthesis as solventless reactions can lead to improved outcomes, and more benign synthetic procedures, in for example aldol condensation reactions, sequential aldol and Michael addition reactions en route to Kr?hnke type pyridines, reactions leading to 3-carboxycoumarins, benzylidenes, 4-aryl-1,4-dihydropyridines and 2-aryl-1,2,3,4-tetrahydroquinazolines, and oligomerisation reactions for the synthesis of cavitands; kinetic considerations for the reaction of two solids can only be explained if a eutectic melt is formed during the reaction.     

Atmospheric organic aerosol production by heterogeneous acid-catalyzed reactions.

Exploratory evidence from our laboratories shows that acidic surfaces on atmospheric aerosols lead to very real and potentially multifold increases in secondary organic aerosol (SOA) mass and build-up of stabilized nonvolatile organic matter as particles age. One possible explanation for these heterogeneous processes are the acid-catalyzed (e.g., H2SO4 and HNO3) reactions of atmospheric multifunctional organic species (e.g., multifunctional carbonyl compounds) that are accommodated onto the particle phase from the gas phase. Volatile organic hydrocarbons (VOCs) from biogenic sources (e.g., terpenoids) and anthropogenic sources (aromatics) are significant precursors for multifunctional organic species. The sulfur content of fossil fuels, which is released into the atmosphere as SO2, results in the formation of secondary inorganic acidic aerosols or indigenous acidic soot particles (e.g., diesel soot). The predominance of SOAs contributing to PM2.5 (particulate matter, that is, 2.5 microm or smaller than 2.5 microm), and the prevalence of sulfur in fossil fuels suggests that interactions between these sources could be considerable. This study outlines a systematic approach for exploring the fundamental chemistry of these particle-phase heterogeneous reactions. If acid-catalyzed heterogeneous reactions of SOA products are included in next-generation models, the predicted SOA formation will be much greater and have a much larger impact on climate-forcing effects than we now predict. The combined study of both organic and inorganic acids will also enable greater understanding of the adverse health effects in biological pulmonary organs exposed to particles.     

Recent advances in plasmonic organic photovoltaics

Light trapping based on the localized surface-plasmon resonance(LSPR)effect of metallic nanostructures is a promising strategy to improve the device performance of organic solar cells(OSCs).We review recent advances in plasmonic-enhanced OPVs with solution-processed metallic nanoparticles(NPs).The different types of metallic NPs(sizes,shapes,and hybrids),incorporation positions,and NPs with tunable resonance wavelengths toward broadband enhancement are systematically summarized to give a guideline for the realization of highly efficient plasmonic photovoltaics.     

Recent advances in organic mechanofluorochromic materials

Mechanofluorochromic materials, which are dependent on changes in physical molecular packing modes, have attracted considerable interest over the past ten years. In this review, recent progress in the area of pure organic mechanofluorochromism is summarized, and majority of the reported organic mechanofluorochromic systems are discussed, along with their derived structure-property relationships. The existence of a structural relationship between aggregation-induced emission compounds and mechanofluorochromism is recognized based on our recent results, which considered aggregation-induced emission compounds as a well of mechanofluorochromic materials. The established structure-property relationship will guide researchers in identifying and synthesizing more mechanofluorochromic materials.     

Recent advances in the iron-catalysed multicomponent reactions

Iron-catalysed reactions are widely used in organic synthesis owing to its benefits over other metals. Among the important organic reactions, multicomponent reactions play a significant role due to its greener aspects like high atom economy, minimal amount of by-product, economic feasibility etc. For the past few years, iron-catalysed multicomponent reactions have attracted the attention of several chemists which lead to the invention of some fine chemistry. The majority of iron-catalysed multicomponent reactions results in the synthesis of heterocyclic compounds having biologically active natural products, pharmaceutical etc. These developments in the iron-catalysed multicomponent reactions are the focus of this review. This is the first review in this topic which covers the literature up to 2020, and it encompasses the different methods for the synthesis of acyclic, carbocyclic and heterocyclic compounds.     

Recent advances in N-heterocyclic carbene-catalyzed radical reactions

The N-heterocyclic carbene(NHC)-catalyzed reactions involving two-electron reaction pathway have been well-established.However,the development of NHC-catalyzed radical reactions is still in its infancy in terms of reaction types and enantioselectivity.In the past decade,several elegant NHC-catalyzed radical reactions have been developed,including NHC-catalyzed oxidation of aldehydes to esters,reductive coupling reactions using Breslow intermediate as SET reductant and NHC-catalyzed reactions via radical homoenolates,dienoaltes and trienolates.This review summarizes the recent advances in NHC-catalyzed reactions involving radical intermediates.     

Recent advances in organic pressure-responsive luminescent materials

Organic luminescent materials are very sensitive to external stimuli,such as pressure,temperature,and electric field.The luminescent properties of some organic luminescent materials significantly change under high pressure.Some materials may show luminescence discoloration,whereas some may exhibit luminescence enhancement.These properties have many potential applications in anticounterfeiting,force sensor,data recording and storage,and luminescent devices,thereby greatly attracting the attention of scientists.In this review,the progress of research on these materials at high pressure in recent years is summarized.     

Recent advances in organic pressure-responsive luminescent materials

Pressure is a powerful tool to regulate the molecule aggregation and intermolecular interactions. Organic luminescent materials under high pressure can produce rich phenomena,which have many potential applications.     

Heteropoly acids, their salts and polyoxometalates as heterogenous, efficient and eco-friendly catalysts in organic reactions: Some recent advances

In this review article, some recent advances of applying heteropoly acids and polyoxometalates as heterogeneous, reusable and eco-friendly catalysts in organic synthesis are discussed.