γ-Amination: The title reaction was developed to give the corresponding dihydropyridazinones in good yields with excellent enantioselectivities (see scheme; Mes=2,4,6-trimethylphenyl). annulation worked well for γ-aryl, γ-alkyl, or γ-alkenyl oxidized enals. Highly enantiopure tetrahydropyridazinones and γ-amino acid derivatives could be easily prepared by chemical transformations of resulting dihydropyridazinones.

The solvent has great effects on vanadium-catalyzed oxidative C–C bond cleavage of 2-phenoxy-1-phenylethanol with molecular oxygen.

Controlling the reaction selectivity of a heterobifunctional molecule is fundamental challenge in many catalytic processes. Recent efforts to design chemoselective catalysts have focused on modifying surface metal nanoparticle materials having tunable properties. However, precise control over properties base-metal oxide remains challenge. Here, we show that green modification with carboxylates can be used tune ammoxidation toward desired products during hydroxyaldehyde manganese catalysts....

The coordination assembly of 1,3,5-trispyridylbenzene with Cu on a Au(111) surface has been investigated by scanning tunneling microscopy under ultrahigh vacuum conditions. An open two-dimensional (2D) metal-organic network honeycomb structure is formed as the 2D covers partial surface. Upon coverage entire surface, further increment molecular density results in multistep nonreversible structural transformation self-assembly. new phases consist networks pentagonal, rhombic, zigzag, and...

We investigated the thermodynamic processes of two-dimensional (2D) metallo-supramolecular self-assembly at molecular resolution using scanning tunneling microscopy and variable-temperature low-energy electron diffraction. On a Au(111) substrate, tripyridyl ligands coordinated with Cu in twofold Cu-pyridyl binding mode or Fe threefold Fe-pyridyl mode, forming 2D open network structure each case. The structures exhibited remarkable thermal stability (600 K for Cu-coordinated 680...

We report an antibacterial surface that kills airborne bacteria on contact upon minutes of solar near-infrared (NIR) irradiation. This employs reduced graphene oxide (rGO), a well-known photothermal conversion agent, as the photosensitizer and is prepared by assembling oppositely charged polyelectrolyte-stabilized rGO sheets (PEL-rGO) quartz substrate with layer-by-layer (LBL) technique. Upon irradiation, resulting PEL-rGO LBL multilayer efficiently generates rapid localized heating and,...

The selective synthesis of biomass-derived 2,5-bis(aminomethyl)furan in 94.1% yield was achieved <italic>via</italic> enhancing the catalytic dehydration–hydrogenation 2,5-diformylfuran dioxime.

Abstract The design of metal oxide catalysts predominantly focuses on the composition or geometry engineering to enable optimized reactivity surface. Despite numerous reports investigating surface chemisorption organic molecules oxides, insights into how adsorption modifiers can be exploited optimize catalytic properties oxides are lacking. Herein, we describe use enolic acetylacetones modify Lewis acid manganese catalysts. acetylacetone modification is stable under reaction conditions and...

Aromatic dinitriles show promise as a pivotal building block in polymer and pharmaceutical chemistry, their production from biomass-based alcohols or aldehydes is highly desirable. In this work, for the first time, 2,5-dicyanofuran was efficiently synthesized biomass-derived 2,5-diformylfuran via two-step procedure. 2,5-Diformylfuran converted to dioxime with 90% isolated yield water. Hydroxylamine instead of ammonia used nitrogen source key strategy, which avoids polymerization reaction...

Liquid-phase ammoxidation of biomass-derived platform compound 5-hydroxymethylfurfural (HMF) provides a sustainable route for the synthesis nitrogen-containing chemicals from renewable resources. A series metal-cation-doped (In3+, Cr3+, Co2+, Ni2+, Cu2+, Zn2+, Al3+) cryptomelanes ([M]-K-OMS-2) were prepared and used as catalyst aerobic ammoxidation-hydration tandem reaction HMF to 2,5-furandicarboxamide. Al-doped K-OMS-2 with refluxing method showed enhanced catalytic performance in...

γ gibt den Ton an: Die Titelreaktion liefert Dihydropyridazinone in guten Ausbeuten und mit ausgezeichneten Enantioselektivitäten (siehe Schema; Mes=2,4,6-Trimethylphenyl). Der Ringschluss gelang glatt oxidierten γ-Aryl-, γ-Alkyl- oder γ-Alkenyl-Enalen. Hoch enantiomerenreine Tetrahydropyridazinone γ-Aminosäure-Derivate waren ausgehend von resultierenden Dihydropyridazinonen leicht zugänglich. As a service to our authors and readers, this journal provides supporting information supplied by...

An unprecedented N-heterocyclic carbene (NHC) catalyzed Morita–Baylis–Hillman (MBH) reaction of β-substituted nitroalkenes and azodicarboxylates has been developed. Both β-aryl β-alkyl worked well for the using 5 mol% NHC catalyst, giving desired α-hydrazino-α,β-unsaturated in good to excellent yields.

Selective aerobic oxidation has provided a promising approach for breaking lignin into smaller aromatics. Here, the reaction pathway of VO(acac)₂-catalyzed model 2-phenoxy-1-phenylethanol in acetic acid was studied.

Abstract The N‐heterocyclic carbene catalyzed [8+2] oxidative annulation of tropone with aldehydes was developed, giving cycloheptatriene‐fused furanones in moderate to good yields. Further reduction the cycloadducts afforded cycloheptane‐fused and dihydrofuranones magnified image

Background Hearing loss (HL) is the third most prevalent condition, significantly affecting individuals and society. Recent research has explored potential impact of nutrition, particularly caffeine intake, on HL. While some studies focus coffee, intake should be assessed across all dietary sources. This study examines association between Methods Our cross-sectional included 6,082 participants from National Health Nutrition Examination Survey (NHANES). Participants were divided into two...