ChemCatChem

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Chiral Phosphoric Acid: A Powerful Organocatalyst for the Asymmetric Synthesis of Heterocycles with Chiral Atropisomerism

Organocatalysis: The advances in the field of chiral phosphoric acid catalyzed reactions for the asymmetric synthesis of heterocycles with chiral atropisomerism, including quinoline, pyrrole, indole, benzimidazole, quinazolinone, isoindolinone, urazole and pyrazole were reviewed. The substrates scope, mechanisms, limitations and applications were discussed....

Mechanochemical Redox: Calcination‐free Synthesis of Ceria‐hybrid Catalyst with Ultrahigh Surface Area

Transition metal‐doped CeO 2 (MCeO x ) is of great importance in industrial catalysis. However, current synthetic methods often result in the separation of MO x phases, which significantly decreases their catalytic activity. Toward this end, the chemistry of mechanochemical redox was introduced to prepare Ce 1‐x Mn x O 2‐δ catalyst. The...

Systematic modification of UiO‐66 metal‐organic frameworks for glucose conversion into 5‐hydroxymethyl furfural in water

Metal organic framework UiO‐66 is studied as an adaptable heterogeneous catalyst for glucose conversion. UiO‐66 was modified by; i) partial linker substitution, ii) particle size modulation and iii) linker defects. We studied the effect of crystallinity and functional groups on the glucose conversion and product yields. The main products are: i) fructose...

3‐D X‐ray Nanotomography Reveals Different Carbon Deposition Mechanisms in a Single Catalyst Particle

Catalyst deactivation involves a complex interplay of processes taking place at different length and time scales. Understanding this phenomenon is one of the grand challenges in solid catalyst characterization. A process contributing to deactivation is carbon deposition (coking), which reduces catalyst activity by limiting diffusion and blocking active...

Direct measurement of enthalpy and entropy changes in NH3 promoted O2 activation over Cu‐CHA at low temperature

Oxygen activation is a key step in the selective catalytic reduction of nitrogen oxides with ammonia (NH 3 ‐SCR) over Cu‐chabazite. We present direct measurements of oxygen adsorption at low temperatures over [NH 3 ‐Cu‐NH 3 ] + complexes and framework‐bound Cu + species in Cu‐chabazite with Si/Al = 14 using isothermal microcalorimetry combined...

Transacylation Kinetics in Fatty Acid and Polyketide Synthases and its Sensitivity to Point Mutations

Fatty acid and polyketide synthases (FASs and PKSs) synthesize physiologically and pharmaceutically important products by condensation of acyl building blocks. The transacylation reaction catalyzed by acyl transferases (ATs) is responsible for the selection of acyl‐CoA esters for further processing by FASs and PKSs. In this study, the AT domains of...

Molybdenum Isomorphously Substituted Decatungstates as Robust and Renewable Photocatalysts for Visible Light‐Driven Oxidation of Hydrocarbons by Molecular Oxygen

A real sun‐trap: The firstly synthesized molybdenum isomorphously substituted decatungstate (Mo–DT) shows a significantly enhanced photocatalytic performance for visible light‐triggered selective oxidation of hydrocarbons by O2 as the incorporated Mo plays vital roles in improving its redox capacity and photophysical and chemical properties. Abstract...

Multi‐enzyme Cascades for the In Vitro Synthesis of Guanosine Diphosphate L‐Fucose

Multi‐enzyme cascade reactions: In vitro enzyme cascades for the one‐pot synthesis of guanosine diphosphate fucose (GDP‐Fuc) from low cost and readily available substrates. In situ co‐factor regeneration was implemented and a robust and scalable ion exchange chromatography protocol for the purification of GDP‐Fuc from the reaction was established. The...

Fast correction of errors in the DFT‐calculated energies of gaseous nitrogen‐containing species

Modeling adsorption phenomena on surfaces by DFT calculations often involves substantial errors, resulting in inaccurate predictions of catalytic activities. Such errors partly stem from the inaccurate description of the energetics of free molecules. Herein, we use a semiempirical group‐additivity method to correct the DFT‐calculated heats of formation...

NiFe‐layered double hydroxide/vertical Bi2WO6 nanoplate arrays with oriented {001} facets supported on ITO glass: Improved photoelectrocatalytic activity and mechanism insight

Enhancing the proportion of {001} facets of Bi2WO6 in photocatalysis has received more and more attention because of its promotion of the hole oxidation. In this work, we successfully fabricated {001} facets highly exposed Bi2WO6 nanoplate arrays (Bi2WO6 NAs) photoelectrode growing on indium tin oxides (ITO) substrate in situ. After electrochemical...

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