Atomic spectrometry update. Review of advances in the analysis of metals, chemicals and materials

Journal of Analytical Atomic Spectrometry, Год журнала: 2013, Номер 28(12), С. 1814 - 1814

Опубликована: Янв. 1, 2013

This review period has seen some changes to the format of review. These are intended more accurately reflect current state analytical research in analysis metals, chemicals and materials. As a consequence, title section headings have been altered this. Significant areas growth include use LIBS remote analysis, especially explosives nuclear The stand-off capability technique makes it very desirable these areas. chemometrics procedures for removing substrate interferences proving be effective making quantitative. It is also beginning reported Process Analysis pharmaceuticals industry employed investigate processes occurring within an engine model explosions. archaeological, cultural heritage art objects continues significant area research, with interesting developments multi-analytical techniques which yield maximum information as little disruption object possible. Similarly, high resolution capabilities synchrotron radiation being increasingly value where cost outweighed by benefits. In field materials development investigating novel material structures activity, e.g., nucleation alpha Alumina via titania templates, studied using range techniques. Papers outlining advances asymmetric flow fractionation multi-detection approach characterisation particle size distribution reviewed comparison hydrodynamic chromatography AFFF. dealing single reviewed. catalyst shorter than previous reviews this reflects fact that fewer new chemistry published. emphasis on latest covering atomic spectrometric measurements follows from last year's review1 should read conjunction other series.2–5 year will time Mike Hinds write His contribution over many years greatly appreciated. We welcome John Marshall writing team.

Язык: Английский

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Facile preparation of fluffy N-doped carbon modified with Ag nanoparticles as a highly active and reusable catalyst for catalytic reduction of nitroarenes

Journal of Colloid and Interface Science, Год журнала: 2017, Номер 506, С. 524 - 531

Опубликована: Июль 20, 2017

Язык: Английский

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Gold-Catalyzed Post-Ugi Ipso-Cyclization with Switchable Diastereoselectivity

The Journal of Organic Chemistry, Год журнала: 2018, Номер 83(15), С. 8170 - 8182

Опубликована: Июль 2, 2018

A gold-catalyzed post-Ugi ipso-cyclization for the diastereoselective synthesis of spirocyclic pyrrol-2-one-dienone system is described. Tuning catalytic system, solvent, and temperature allowed selectively attaining two sets diastereoisomers. The scope process has been evaluated, a putative mechanistic model was proposed.

Язык: Английский

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Modular Synthesis of Polycyclic Alkaloid Scaffolds via an Enantioselective Dearomative Cascade

Organic Letters, Год журнала: 2020, Номер 22(3), С. 1175 - 1181

Опубликована: Янв. 15, 2020

The polycyclic core of the akuammiline alkaloids can be synthesized from simple tryptamine and tryptophol derivatives via a Ag(I)-catalyzed enantioselective dearomative cyclization cascade sequence. complex tetracyclic scaffolds are prepared rapid, versatile, three-step modular synthesis commercially available indole in high yields enantiomeric excess (up to 99% yield >99% ee).

Язык: Английский

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Core‐shell microgel stabilized silver nanoparticles for catalytic reduction of aryl nitro compounds

Applied Organometallic Chemistry, Год журнала: 2020, Номер 34(9)

Опубликована: Май 18, 2020

Silver nanoparticles loaded into shell of poly (styrene‐N‐isopropylmethacrylamide‐co‐acrylic acid) core [P (SNA‐CS)] gel particles were synthesized and analyzed by Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), ultraviolet–visible (UV–vis) dynamic light scattering (DLS). Catalytic activity Ag@P (SNA‐CS) was investigated reducing p‐nitroaniline (p‐NA) p‐aminoaniline (p‐AA) in the presence sodium borohydride (NaBH 4 ) reductant. Molecules substrate adsorbed on surface silver interact with ions (BH − to form p‐AA. Other nitroarenes like o‐nitroaniline (o‐NA), p‐nitrophenol (p‐NP) o‐nitrophenol (o‐NP), 2,4‐dinitrophenol(2,4‐DNP) also reduced their corresponding aryl amines using composite microgels as catalyst. Reported catalyst efficiently nitro aromatic compounds individually well simultaneously at ambient temperature. Effect different reaction conditions (catalyst dose, concentration NaBH p‐NA) completion time, value apparent rate constant (k app reduction efficiency for p‐NA demonstrated. found be able retain up four cycles.

Язык: Английский

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Dearomatizing Spiroannulation Reagents: Direct Access to Spirocycles from Indoles and Dihalides

Organic Letters, Год журнала: 2018, Номер 20(11), С. 3349 - 3353

Опубликована: Май 10, 2018

Unfunctionalized indoles can be directly converted into 3,3′-spirocyclic indolenines and indolines upon reaction with electrophilic dihalides in the presence of t-BuOK/BEt3. This double C–C bond forming reaction, which simultaneously generates a quaternary spirocyclic center, typically proceeds high yield has good functional group tolerance. In contrast to existing dearomatizing spirocyclization approaches, there is no need prepare prefunctionalized aromatic precursor, enabling faster access valuable products from simple, commercially available aromatics one step.

Язык: Английский

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Regium-π vs Cation-π Interactions in M2 and MCl (M = Cu, Ag and Au) Complexes with Small Aromatic Systems: An ab Initio Study

Inorganics, Год журнала: 2018, Номер 6(3), С. 64 - 64

Опубликована: Июнь 24, 2018

In this study we have theoretically analyzed (RI-MP2/def2-TZVP) the ability of metal moieties involving elements from group IB (Cu, Ag and Au) to establish either regium-π or cation-π interactions with π-systems different electronic nature. More precisely, used M2 (oxidation state = 0) MCl +1) molecules where M Cu, Au. On other hand, benzene, trifluorobenzene hexafluorobenzene as aromatic rings. Furthermore, Bader’s theory “Atoms in Molecules” well NBO (Natural Bonding Orbital) calculations further investigate characterize complexes described herein. We believe our findings may be important when describing characterizing both a chemical context, explore nature recently uncovered bond.

Язык: Английский

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Transition Metal‐Catalyzed Dearomative Vinylation of Electron Rich Benzenes, Naphthalenes and Indoles with Alkynes

Advanced Synthesis & Catalysis, Год журнала: 2023, Номер 365(3), С. 270 - 294

Опубликована: Янв. 10, 2023

Abstract Dearomatization reactions are among the most efficient chemical processes, combining atom economy, stereospecificity and ability to generate molecular complexity in a single step. Dearomative vinylation provide synthetic connection between readily available, simple aromatic starting materials more unsaturated alkynes. The last decade has witnessed steady increase development of transition metal‐catalyzed dearomative methods electron rich compounds with alkynes, providing new approaches high‐value building blocks natural products. This review aims serve as comprehensive reference for work magnified image

Язык: Английский

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Metal Nanoparticle‐Catalyzed Alkyne Cyclization for the Synthesis of Heterocycles

Advanced Synthesis & Catalysis, Год журнала: 2024, Номер 366(14), С. 3085 - 3104

Опубликована: Май 22, 2024

Abstract Heterocycles are important compounds existed in diverse advanced chemicals, functional materials, bioactive molecules and natural products. Different strategies through transition metal‐catalyzed alkyne cyclization have been developed to synthesize various heterocycles. The merger of metal nanoparticle catalysis has emerged as an approach By using different kinds catalysts, such gold, silver, copper palladium nanoparticles, a number heterocycles prepared with high yield selectivity green, sustainable highly efficient manner. This review summarizes discusses recent achievements nanoparticle‐catalyzed for the synthesis

Язык: Английский

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Redox-Neutral Cascade Dearomatization of Indoles via Hydride Transfer: Divergent Synthesis of Tetrahydroquinoline-Fused Spiroindolenines

The Journal of Organic Chemistry, Год журнала: 2019, Номер 84(21), С. 13935 - 13947

Опубликована: Сен. 19, 2019

The redox-neutral cascade dearomatization of indoles with o-aminobenzaldehydes has been realized via the hydride transfer strategy, achieving condition- and substrate-controlled divergent synthesis tetrahydroquinoline-fused spiroindolenines. integration transfer-involved C(sp3)–H functionalization provides a promising platform for construction structurally diverse molecules.

Язык: Английский

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