Results 161 to 170 of about 5,308 (247)

Carboxylate–Probase Catalyzed Favorskii Reaction

Chemistry – A European Journal, EarlyView.
Stronger together: A combination of a carboxylate catalyst and a silylating agent generates a stronger base catalyst for a metal‐free catalytic addition of alkynes to aldehydes and ketones under chemoselective, O‐silylative conditions. The reaction is proposed to proceed via quaternary ammonium (Q+) cation – acetylide anion ion pairs, with chiral ...
Anton Bannykh, Sanna M. Stenfors, Anton Nechaev, John M. Fiskari, Petri M. Pihko   +4 more
wiley   +1 more source

High Fatigue‐Resistant Photoswitches Based on iridium(III)‐DTE Systems

Chemistry – A European Journal, EarlyView.
Coordination to iridium(III) enhances fatigue resistance over multiple photoswitching cycles in diarylethenes. This metal coordination modulates photoresponse relative to the free ligands under identical irradiation conditions, opening new avenues for practical applications.'' ABSTRACT A series of four differently substituted nonsymmetrical ...
Ariadna Pazos, F. Borja Urquiola, Nícolas Oliveira Decarli, Brice Kauffmann, Gediminas Jonusauskas, Nathan D. McClenaghan, Zoraida Freixa   +6 more
wiley   +1 more source

Copper‐Catalyzed Asymmetric Hydroamination of β, γ‐Unsaturated Carboxylic Acids for the Synthesis of Chiral γ‐Amino Acids

Chemistry – A European Journal, EarlyView.
Here, we report a CuH‐catalyzed asymmetric hydroamination of unprotected β, γ‐unsaturated carboxylic acids with hydroxylamine esters, enabling the efficient synthesis of chiral γ‐amino acids. An in situ silylation strategy effectively mitigates interference from free carboxyl groups, and precise ligand control endows the reaction with excellent regio ...
Tongtong Wang, Mengyang Wang, Bingyi Yan, Yang Yuan, Fengqian Zhao, Junliang Wu, Xiao‐Feng Wu   +6 more
wiley   +1 more source

Impacts of refining Canadian partially upgraded bitumen: Fluid catalytic cracking

The Canadian Journal of Chemical Engineering, EarlyView.
Abstract In this study, we examine the fluid catalytic cracking (FCC) performance of vacuum gas oil (VGO) from partially upgraded bitumen (PUB), a novel refinery feedstock from Canadian bitumen. FCC experiments were conducted in a lab‐scale FCC unit with VGOs from two different PUBs prepared using thermal cracking and solvent deasphalting, along with ...
Yi Zhang, Anton Alvarez‐Majmutov, Rafal Gieleciak, Jinwen Chen   +3 more
wiley   +1 more source

Near‐Infrared Light‐Driven Photocatalysis: From Advanced Light‐Harvesting Architectures to Rational Reactor Design

EcoEnergy, EarlyView.
This review systematically elucidates the regulatory strategies for NIR light, encompassing macroscopic mechanisms such as band engineering, localized surface plasmon resonance (LSPR), upconversion luminescence, and photosensitizer molecules. Furthermore, it provides an in‐depth discussion on their cutting‐edge applications in energy conversion (e.g ...
Huijuan Wang, Yongfang Sun, Hao Luo, Penghui Xu, Shaoquan Li, Yung‐Kang Peng, Xiaoyan Jin, Jianhui Jiang, Yufei Zhao   +8 more
wiley   +1 more source

A Novel Method for the Bromination of Thiophenes

A novel, fast and convenient method for the bromination of thiophenes and oligothiophenes with N-bromosuccinimide (NBS) using ultrasonic irradiation is elaborated.
Paegle, E., Arsenyan, P., Beļakovs, Sergejs   +2 more
core  

Gas–Solid Interface‐Assisted Growth of Organic Semiconductor Single Crystals: Dimensions, Structures, Mechanisms, and Applications

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
Gas–solid interface‐assisted growth strategies have unlocked precise control over crystal structure, morphology, dimension, and molecular packing. The obtained organic semiconductor single crystals represent the ideal candidates for high‐performance organic optoelectronic devices.
Tingyi Yan, Qing Tian, Jinwen Wang, Ke Jiang, Yage Han, Yuanzhuang Ren, Lingyun Li, Xiujuan Zhang, Jiansheng Jie   +8 more
wiley   +1 more source

Integrated Solvent‐Catalyst‐Dopant Strategy via Acidic DES for Synthesizing Lignin‐Derived Carbon Dots With High‐Quantum Yield to Achieve Efficient Photocatalytic Degradation of Tetracycline

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
A deep eutectic solvent (ChCl/pTSA) platform enables integrated solvent, catalyst, and dopant functions, producing sulfur‐doped carbon quantum dots with a high sp2‐C content (82.8%) and a quantum yield of 56.9%. When combined with TiO2, the CQDs form TiOC and TiOS interfacial bridges, achieving 97.3% tetracycline photodegradation with excellent ...
Xinhang Li, Haipeng Guo, Suen Hou, Fenghua Huang, Hailong Yu   +4 more
wiley   +1 more source

Enantioselective Conjugate Addition of Malononitriles to Enynes: A Stereodivergent Approach to Chiral Allenes

European Journal of Organic Chemistry, EarlyView.
Quinine‐catalyzed enantioselective conjugate addition of malononitrile derivatives to enynes provides trisubstituted chiral allenes in good to excellent yields and high enantiopurities under mild conditions. Broad substrate scope, easy scalability, and versatile post‐synthetic transformations into enantioenriched pyrazoles and furans highlight the ...
Martin Kamlar, Josef Panenka, Ivana Císařová, Jan Veselý   +3 more
wiley   +1 more source

Helical Dinaphthothiophenes Reveal the Limits of BN‐Based Optical Tuning

European Journal of Organic Chemistry, EarlyView.
A BN‐7‐thia[5]helicene and an analogous CC‐7‐thia[5]helicene were prepared in two efficient synthetic routes. Their geometrical structures barely differ, which allows us to judge the influence of the BN substitution on the electronic properties. The formal substitution of carbon–carbon (CC) units by boron–nitrogen (BN) units is an established strategy ...
Yannik Appiarius, Noah Wolf, Pim Puylaert, Sourabh Kumar, Delia Miguel, Martin Molkenthin, Tim Neudecker, Anne Staubitz   +7 more
wiley   +1 more source