Results 51 to 60 of about 1,986 (189)

Ringmethylierung kontrolliert die Wasserstoffbrücken‐Andockstelle bei Anisol

Angewandte Chemie, 2015
AbstractEin Methanolmolekül kann mit seiner OH‐Gruppe entweder über einen OH⋅⋅⋅O‐ oder einen OH⋅⋅⋅π‐Kontakt an ein Anisolmolekül binden. Wie durch FTIR‐Absorptionsspektroskopie nachgewiesen wird, lässt sich das Verhältnis der Häufigkeiten dieser beiden Motive in Überschallexpansionen um eine Größenordnung verändern, indem Anisol am aromatischen Ring ...
Hannes C. Gottschalk, Jonas Altnöder, Matthias Heger, Martin A. Suhm   +3 more
openaire   +2 more sources

Insights Into Symmetry and Substitution Patterns Governing Singlet–Triplet Energy Gap in the Chemical Space of Azaphenalenes

Chemistry – A European Journal, EarlyView.
ABSTRACT Molecules that violate Hund's rule by exhibiting an inverted singlet–triplet gap (STG), where the first excited singlet (S1${\rm S}_1$) lies below the triplet (T1${\rm T}_1$), are rare but hold great promise as efficient fifth‐generation light emitters.
Atreyee Majumdar, Raghunathan Ramakrishnan   +1 more
wiley   +1 more source

Generation of a Ground‐State Electron Donor Utilizing Stored Light Energy

Chemistry – A European Journal, EarlyView.
Chemically stored light energy enables the generation of dianion reductants (∼−2.7 V) from vicinal diols derived from diaryl ketone photodimerization. These ground‐state electron donors efficiently reduce challenging substrates at room temperature, including aryl bromides, alkyl iodides, and sulfonamides.
Marc Taillefer, Éric Clot, Alexis Prieto   +2 more
wiley   +1 more source

Insights into the Photocatalytic Arene Bromination Enabled by Cs2AgBiBr6 Microparticles

Chemistry – A European Journal, EarlyView.
A sustainable photocatalytic bromination of electron‐rich arenes is enabled by low‐toxicity Cs2AgBiBr6 double‐perovskite microparticles using HBr as an atom‐economical bromine source. Surface‐derived bromine radicals drive highly selective mono‐bromination under mild conditions.
Daniele Conelli, Chiara Lo Porto, Mokurala Krishnaiah, Kimmo Lahtonen, G. Krishnamurthy Grandhi, Nicola Margiotta, Paola Vivo, Gian Paolo Suranna, Roberto Grisorio   +8 more
wiley   +1 more source

Overcoming contact issues in bottom‐contact, short‐channel organic transistors with van der Waals conformal contacts

FlexMat, EarlyView.
A new conformal contact transfer strategy is developed to enhance the contact interface quality between organic semiconductors and metal electrodes in bottom‐contact, short channel organic field‐effect transistors. By utilizing interfacial water permeation and surface functionalization, the method achieves a van der Waals conformal contact interface ...
Yuan Tan, Wei Deng, Yongji Wang, Haoyu Jiang, Xinghan Meng, Xiujuan Zhang, Xiaohong Zhang, Jiansheng Jie   +7 more
wiley   +1 more source

Intramolecular C–H Nitrene Insertion Catalyzed by Single‐Atom Cobalt on Nitrogen‐Doped Carbon

Helvetica Chimica Acta, EarlyView.
A cobalt single‐atom catalyst was applied to intramolecular C(sp3)–H nitrene insertion to synthesize benzosultams. The catalyst was reused for 17 times with cumulative turnover number 340. ABSTRACT Single‐atom catalysts (SACs) are advancing heterogeneous organic synthesis by combining the molecular precision of homogeneous complexes with the ...
Tomohiro Yasukawa, Yuki Nakao, Yasuhiro Yamashita, Muneaki Yamamoto, Tomoko Yoshida, Shū Kobayashi   +5 more
wiley   +1 more source

Synthesis and transformation of halochromones [PDF]

, 2014
Chromones (4H-1-benzopyran-4-ones) are one of the most abundant groups of naturally occurring oxygen containing heterocyclic compounds possessing a benzo-γ-pyrone framework, 1a.
Santos, Clementina M.M., Silva, Artur, Tomé, Sara M.   +2 more
core   +1 more source

Enzymatic Ring‐Opening Polymerization of ε‐Caprolactone in Novel Green Solvents: from Batch Systems to Continuous Flow Mesoreactors

Macromolecular Materials and Engineering, EarlyView.
Multi‐gram synthesis of CaLB‐catalyzed ROP of ε‐CL in green organic media under flow conditions. ABSTRACT The transition toward sustainable alternatives in polymeric material production is a critical step in reducing the environmental impact of the traditional plastic industry.
Tullio Crovetto, Andrea Pasquale, Daniele Alessandro Consolini, Martina Letizia Contente, Alessandro Pellis   +4 more
wiley   +1 more source

A screening method for ranking chemicals by their fate and behaviour in the environment and potential toxic effects in humans following non-occupational exposure [PDF]

, 2004
A large number of chemicals are released intentionally or unintentionally into the environment each year. These include thousands of substances that are currently listed worldwide and several hundred new substances added annually (Mücke et al., 1986 ...
Capelton, A, Duarte-Davidson, R, Troisi, G   +2 more
core  

FeCl3‐Catalyzed Synthesis of Ynones from Silylated Alkynes and Acetic Anhydride

ChemistryOpen, EarlyView.
The synthesis of alkynones from silylated alkynes and acid chlorides, first reported by Birkhofer in 1963, remains a valuable transformation. However, its reliance on stoichiometric AlCl3 and corrosive reagents raises environmental and practical concerns. To address this, a greener protocol using catalytic FeCl3 and acetic anhydride is developed.
Paul Charki, Urs Gellrich, Daniel S. Müller   +2 more
wiley   +1 more source