Potassium-ion batteries (PIBs) are attracting intensive interest for large-scale applications due to the high natural abundance of potassium sources. However, large radius K+ makes it difficult electrode materials accommodate repeated insertion and extraction. Thus, developing high-performance PIBs remains a great challenge. Herein, we present rational design fabrication hierarchical carbon-coated MoSe2/MXene hybrid nanosheets (MoSe2/MXene@C) as superior anode material PIBs. Specifically,...

Constructing ordered hierarchical porous structures while maintaining their overall crystalline order is highly desirable but remains an arduous challenge. Herein, we successfully achieve the growth of single-crystalline metal-organic frameworks (MOFs) in three-dimensional (3D) macroporous template voids by a saturated solution-based double-solvent-assisted strategy with precise control over nucleation process. The as-prepared macro-microporous Co-based MOFs (SOM ZIF-67) exhibit structure...

α-K_0.19MnO₂ nanotubes with high K⁺ content as cathodes for zinc-ion batteries show capacity, excellent rate capability and cycling stability.

A facile type of one-pot, transition-metal-free domino process was developed for the synthesis oxazoles. Thus, a variety polysubstituted oxazoles were easily synthesized via t-BuOOH/I(2)-mediated oxidative cyclization from readily available starting materials under mild conditions.

A new and efficient method for the synthesis of amides via palladium-catalyzed C−C coupling aryl halides with isocyanides is reported, by which a series were formed from readily available starting materials under mild conditions. This transformation could extend its use to natural products significant pharmaceuticals.

Abstract A concise synthesis of pyrazolo[1,5‐a]indole derivatives by copper‐catalyzed aerobic oxygenation and cyclization indoles with oxime acetates is described. This protocol represents an elegant example N‐1, C‐2, C‐3 tri‐functionalization in one‐pot. Mechanistic studies indicate the reaction proceeds through a radical procedure. Oximes as internal oxidant have been demonstrated to be driver initiate oxidation, which provides new oxidative pattern for C‐H functionalization even high...

ADVERTISEMENT RETURN TO ISSUEPREVLetterNEXTConversion of Pyridine to Imidazo[1,2-a]pyridines by Copper-Catalyzed Aerobic Dehydrogenative Cyclization with Oxime EstersHuawen Huang, Xiaochen Ji, Xiaodong Tang, Min Zhang, Xianwei Li, and Huanfeng Jiang*View Author Information School Chemistry Chemical Engineering, South China University Technology, Guangzhou 510640, P. R. China[email protected]Cite this: Org. Lett. 2013, 15, 24, 6254–6257Publication Date (Web):November 21, 2013Publication...

A novel ammonium iodide-induced sulfonylation of alkenes with DMSO and water toward the synthesis vinyl methyl sulfones is described. The process proceeded smoothly under metal-free conditions high stereoselectivity good functional group tolerance. reaction mechanism was revealed to proceed through a domino oxidation elimination after radical addition alkenes.

Radical addition is a robust tool for bond formation. While ketyl radical reactivity of aldehydes by photoredox has been well-established, herein, we have now revealed pathway umpolung with or without external reductant. Hence, the reductive alkylations and challenging benzylations nitrogen heteroarenes (i.e., Minisci reactions) are enabled bromide-promoted visible light-mediated photocatalysis. The present protocol offers mild, viable method late-stage transition-metal-free biologically...

Abstract Nanostructure design and in situ transmission electron microscopy (TEM) are combined to demonstrate Sb‐based nanofibers composed of bunched yolk–shell building units as a significantly improved anode for potassium‐ion batteries (PIBs). Particularly, metal–organic frameworks (MOFs)‐engaged electrospinning strategy coupled confined ion‐exchange followed by subsequent thermal reduction is proposed fabricate Sb@C nanoboxes embedded carbon (Sb@CNFs). In TEM analysis reveals that the...

An efficient procedure for the formation of C–S bonds<italic>via</italic>direct C–H functionalization has been developed under aqueous conditions.

A robust and regioselective copper(II)-catalyzed cycloaddition of internal alkynes nitriles providing an effective access to oxazole fragments is reported herein. Water substantially participated in this reaction. Control experiments proposed that transformation may proceed via enamide intermediate. This strategy enables the preparation core structure a COX-2 inhibitor.

An efficient indole-to-carbazole strategy has been developed under metal-free conditions. This carbazole formation was highly promoted by NH4I with high regioselectivity through formal [2 + 2 2] annulation of indoles, ketones, and nitroolefins. It thus conveniently enabled the assembly a large number diversified products good tolerance broad range functional groups.

A series of substituted quinolines was prepared from arylamines, aldehydes, and terminal olefins (see scheme). The palladium-catalyzed sequential formation C-C bonds proceeds smoothly with both electron-deficient electron-rich olefins. When acrylic acid is used as olefin, decarboxylation occurs to provide 2-substituted quinolines.

Abstract An efficient copper‐catalyzed method for the synthesis of 2‐haloimidazopyridines with aminopyridines and haloalkynes using molecular oxygen as oxidant in a one‐pot manner has been developed. In this process, reaction appears to be very general suitable construction variety 2‐halo‐substituted imidazopyridines, imidazopyrazines imidazopyrimidines. The intermolecular oxidative diamination was achieved first time. Importantly, mild conditions conversion alkyl‐substituted are great...

A metal-free process for the synthesis of 2-aminobenzothiazoles from cyclohexanones and thioureas has been developed using catalytic iodine molecular oxygen as oxidant under mild conditions. Various 2-aminobenzothiazoles, 2-aminonaphtho[2,1-d]thiazoles, 2-aminonaphtho[1,2-d]thiazoles were prepared via this method in satisfactory yields.

Catalytic dehydrogenative aromatization has emerged as an efficient and environmentally friendly way to access functionalized arenes in recent years.

A facile and versatile catalytic system involving copper catalyst, K3PO4 as the base, O2 oxidant has been developed to enable efficient synthesis of 2,4,6-trisubstituted 2,6-disubstituted 1,3,5-triazines 1,3-disubstituted 1,2,4-triazoles from amidines with trialkylamines, DMSO, DMF reaction partners, respectively. This protocol features inexpensive metal green oxidant, good functional group tolerance, high regioselectivity, providing an entry those products that are challenging prepare by...

A novel and efficient palladium-catalyzed dehydrogenative aminohalogenation of alkenes with molecular oxygen as the sole oxidant has been developed. This protocol provides a valuable synthetic tool for assembly wide range brominated enamines under mild conditions, unprecedented stereoselectivity exceptional functional group tolerance. attractive route synthesis is great significance due to products' versatile reactivity further transformations.

An efficient copper-catalyzed C–N bond cleavage of aromatic methylamines was developed to construct pyridine derivatives. With neat conditions and facile operation, the fragment-assembling strategy affords a broad range 2,4,6-trisubstituted pyridines in up 95% yield from simple readily available starting materials. Interestingly, when pyridin-2-yl methylamine employed as substrate, α-alkylation reaction ketones occurred give β-(pyridin-2-yl) instead pyridines.

Highly efficient methods for the synthesis of 2-arylbenzothiazoles and 2-arylnaphtho[2,1-d]thiazoles have been developed. Readily available aromatic amines, benzaldehydes, elemental sulfur were directly assembled through oxidative annulation C–H functionalization under transition-metal-free conditions, where DMSO or oxygen served as oxidant. NH4I KI catalyst was found to be effective promote transformations give products in good excellent yields with wide functional group tolerance.

A novel route is disclosed for the synthesis of 1,2,4-thiadiazoles starting from amidines, elemental sulfur, and 2-methylquinolines or aldehydes under transition-metal-free conditions. This three-component approach affords efficient rapid access to 3,5-diaryl substituted with good tolerance a broad range funcitional groups. Mechanistic studies reveal radical-involved pathway.