We describe the first efficient, direct asymmetric Mannich reactions with malonates and N-Boc aryl alkyl imines by cooperative hydrogen-bonding catalysis a cinchona alkaloid bearing thiourea functionality. have also extended scope of this reaction to beta-ketoesters. The synthetic value new is demonstrated in establishment convergent enantioselective route toward biologically important beta-amino acids under mild air- moisture-tolerant conditions.

In this communication, we report an asymmetric Friedel-Crafts reaction of indoles with imines catalyzed by a bifunctional cinchona alkaloid catalyst. This is the first efficient organocatalytic imines. operationally simple and, unprecedentedly, affords high enantioselectivity for wide range and both aryl alkyl establishes direct, convergent, versatile approach to optically active 3-indolyl methanamines, structural motif embedded in numerous indole alkaloids synthetic derivatives.

In this communication, we describe the development of first highly enantioselective catalytic conjugate addition to vinyl sulfones. Promoted by readily accessible organocatalysts derived from C6'−OH cinchona alkaloid derivatives and under mild, air- moisture-tolerant conditions, additions a wide range α-cyanoacetates bearing either an α-aryl or α-alkyl substituent sulfones proceeded in excellent enantioselectivity high yield. Consequently, efficient operationally simple C−C bond forming...

An Si photoelectrode with a nanoporous Au thin film for highly selective and efficient photoelectrochemical (PEC) CO 2 reduction reaction (CO RR) is presented. The formed by electrochemical of an anodized film. treatments the critically improve catalytic activity catalysts exhibit Faradaic efficiency 96% at 480 mV overpotential. To apply pretreatment films PEC RR, new design mesh‐type co‐catalysts independently wired front back demonstrated. Due to superior RR mesh high photovoltage from Si,...

The instability of carbamate-protected alkyl imines has greatly hampered the development catalytic asymmetric Mannich reactions suitable for synthesis optically active chiral amines. A highly enantioselective reaction with in situ generation from stable α-amido sulfones catalyzed by an organic catalyst was developed. This provides a concise and route converting aromatic aliphatic aldehydes into aryl β-amino acids.

Development of efficient and selective electrocatalysts is a key challenge to achieve an industry-relevant electrochemical CO2 reduction reaction (CO2RR) produce commodity chemicals. Here, we report that Au25 clusters with Au-thiolate staple motifs can initiate electrocatalytic CO nearly zero energy loss high CO2RR current density 540 mA cm–2 in gas-phase reactor. Electrochemical kinetic investigations revealed the activity originates from strong binding affinity, leading electrolysis...

Electrocatalytic CO2 reduction is a promising way to provide renewable energy from gaseous The development of nanostructures improves efficiency and selectivity for value-added chemicals, but complex limit the conversion rates due poor mass transport during vigorous electrolysis. Herein, we propose three-dimensional (3D) hierarchically porous Au comprising interconnected macroporous channels (200-300 nm) nanopores (∼10 fabricated via proximity-field nanopatterning. macropores enable...

Electrochemical CO2 reduction is one of the promising ways to convert value-added products such as CO. Many studies have dealt with suppressing hydrogen evolution reaction (HER) and increasing (CO2RR) through modification metal surface additives anchoring agent, anion, etc. However, there are only a few about modifying Au additives. We present here theoretical prediction that addition CN Cl species on an electrode would enhance electrochemical CO2RR due van der Waals interactions these large...

We propose and experimentally verify an innovative label-free optical fiber biosensor based on a Mach-Zehnder interferometer for bovine serum albumin (BSA) concentration detection. The proposed utilized micro-cavity within single-mode to induce interference. A remarkable feature of this is that external media can directly interact with the core signal through microfluidic channels connected sensor surface. device was fabricated by means femtosecond laser micromachining chemical etching. type...

Electrochemical CO2 conversion offers a promising route for value-added products such as formate, carbon monoxide, and hydrocarbons. As result of the highly required overpotential reduction, researchers have extensively studied development catalyst materials in typical H-type cell, utilizing dissolved reactant liquid phase. However, low solubility an aqueous solution has critically limited productivity, thereby hindering its practical application. In efforts to realize commercially available...

Thermal stress significantly impacts the durability of perovskite solar cells (PSCs), as evidenced by severe degradation observed at 85 °C in this study. This is attributed to gold migration through soft 2,2′,7,7′‐tetrakis( N , ‐di‐4‐methoxyphenylamino)‐9,9′‐spirobifluorene (spiro‐MeOTAD) hole transport layer (HTL) into layer, driven gold's low formation energy and diffusion barrier. To mitigate issue, several vacuum‐evaporable hard transition metal oxides charge extraction interlayers...

MoS₂ is an earth-abundant and low-cost HER electrocatalyst that can substitute noble metal catalysts. Here, we develop the atomic layer deposition (ALD) of nanomaterials on p-Si photocathodes for highly efficient stable PEC water reduction reactions.

Morphology-controlled Au nanostructures are fabricated<italic>via</italic>electroreduction of anodized thin films, exhibiting efficient catalytic activity for electrochemical CO₂reduction.

Cobalt oxide (CoOx), an earth-abundant and low-cost oxygen evolving catalyst (OEC), has notable advantages as a top protection layer of photoanodes for solar-driven water oxidation because its desirable durability. However, cobalt oxides exist various phases, such Co(II)O, Co2(III)O3, Co3(II,III)O4, the (photo)electrochemical properties CoOx are significantly governed by phase. Atomic deposition (ALD) is suitable method to form multifunctional photoelectrochemical (PEC) splitting it allows...

In this study, ZnTi-mixed metal oxides (ZTM), such as ZnTiO3, were synthesized from ZnTi layered double hydroxides by varying the molar ratio of Zn/Ti, calcination temperatures, and synthesis methods (hydrothermal or reflux). The surface electronic characteristics ZTM investigated energy-resolved distribution electron traps (ERDTs) using reversed double-beam photoacoustic spectroscopy. samples obtained conducting hydrothermal at 500 °C showed similar ERDT patterns independent although ZnTiO3...

A Ni single-atom catalyst with Ni–N4–xCx active sites is prepared in a single pyrolysis step which the atom incorporated carbon framework through nitrogen and coordination utilizing ionothermal synthesis method. In comparison to complicated procedures of catalysts, this method provides general facile obtain catalysts an opportunity synthesize at large scale. The precursors used such as adenine, fructose, glucose are derived from biomass essential requirement for green process. synthetic...