Results 91 to 100 of about 3,272,143 (363)

The Influence of the Supporting Substrate on Single‐Particle Circular Differential Scattering of DNA Assembled Nanorod Dimers

Advanced Optical Materials, EarlyView.
For most microscopy measurements the sample is placed on a substrate, which causes symmetry breaking, especially relevant for chiral plasmonic nanostructures. DNA origami mediated X‐shaped AuNR dimers showing high structural purity in solution, exhibit significant diversity in lineshapes and signal intensities for their circular differential scattering
Amrita Chakraborty, Ojasvi Verma, Gopal Narmada Naidu, Mihir Dass, Zhenyang Jia, Christy F. Landes, Alessandro Alabastri, Peter Nordlander, Tim Liedl, Stephan Link   +9 more
wiley   +1 more source

Radical Fluoroalkylation Reactions [PDF]

, 2018
Recent protocols and reactions for catalytic radical perfluoroalkylations will be described. The production of perfluoroalkyl radicals (RF = CnF2n+1, n ≥ 2), which effect both addition and substitution reactions on organic substrates, can be realized ...
Barata Vallejo, Sebastian, Cooke, María Victoria, Postigo, A.   +2 more
core   +1 more source

Toward Enhancing Chiro‐Optical and Magneto‐Optical Properties of Magnetic Nanocrystals by Surface Plasmons

Advanced Optical Materials, EarlyView.
Here, recent progress is highlighted in colloidal magnetoplasmonic hybrid nanomaterials, with a focus on chiral plasmonics. Metal nanocrystals with intrinsic chiroptical features can lead to a combination of chiral plasmonics and magneto‐optics effects when interacting with the magnetic counterpart, offering a foundation for systematically designing ...
Miguel Comesaña‐Hermo, Eloi Haltz, Alessio Gabbani, Francesco Pineider, Verónica Salgueiriño   +4 more
wiley   +1 more source

Enantioselective Total Synthesis of (–)-Myrifabral A and B [PDF]

, 2020
A catalytic enantioselective approach to the Myrioneuron alkaloids (−)-myrifabral A and (−)-myrifabral B is described. The synthesis was enabled by a palladium-catalyzed enantioselective allylic alkylation, that generates the C(10) all-carbon quaternary ...
Bartberger, Michael D., Chen, Anthony Y., Fulton, Tyler J., Stoltz, Brian M.   +3 more
core  

Organocatalytic synthesis of axially chiral atropisomers [PDF]

, 2017
This review summarises the recent progress made in the organocatalytic synthesis of atropisomeric compounds. Methodologies based on dynamic kinetic resolution and direct access to BINOL-like biaryls are described.
Renzi, P.
core   +1 more source

Enzymatic Synthesis of Enantiopure (R)‐Citronellal from Geraniol via a Short‐Chain Dehydrogenase and Ene Reductase

Advanced Synthesis &Catalysis, EarlyView.
A synthetic cascade with two consecutive biocatalytic steps consisting of a short‐chain alcohol dehydrogenase and an ene reductase in a biphasic system provides (R)‐citronellal with >90% conversion and >99% enantiomeric excess from inexpensive geraniol. The development of synthetic routes to produce enantiopure (R)‐citronellal as a key intermediate for
Claudia Ferrer‐Carbonell, Rocio Villa, Iris Viskaal, Diederik J. Opperman, Caroline E. Paul   +4 more
wiley   +1 more source

Oxidative Heck desymmetrisation of 2,2-disubstituted cyclopentene-1,3-diones [PDF]

, 2015
Oxidative Heck couplings have been successfully developed for 2,2-disubstituted cyclopentene-1,3-diones. The direct coupling onto the 2,2-disubstituted cyclopentene-1,3-dione core provides a novel expedient way of enantioselectively desymmetrising all ...
Beattie, N. A., Lamb, C. J. C., Lee, A.-L., Nikodemiak, P., Walker, S. E.   +4 more
core   +1 more source

Asymmetric Synthesis of Highly Substituted Spiro[2H‐pyrrole‐2,3‐Succinimide] Derivatives by Copper‐Catalyzed Post‐Ugi Reactions

Advanced Synthesis &Catalysis, EarlyView.
Abstract Herein we present a novel one‐pot methodology for the synthesis of enantioenriched 2H‐pyrrolespirosuccinimides by copper‐catalyzed reactions on Ugi adducts derived from enantiopure α‐alkylbenzyl amines through a chirality transfer process. We have proposed a mechanism, supported by density functional theory (DFT) calculations, where a hydrogen
Javier Gómez‐Ayuso, Israel Carreira‐Barral, Roberto Quesada, María García‐Valverde   +3 more
wiley   +1 more source

Molybdenum-catalyzed enantioselective sulfoxidation controlled by a nonclassical hydrogen bond between coordinated chiral imidazolium-based dicarboxylate and peroxido ligands [PDF]

, 2018
Chiral alkyl aryl sulfoxides were obtained by molybdenum-catalyzed oxidation of alkyl aryl sulfides with hydrogen peroxide as oxidant in mild conditions with high yields and moderate enantioselectivities.
Carrasco Carrasco, Carlos Jesús, Galindo del Pozo, Agustín, Montilla Ramos, Francisco Javier   +2 more
core  

Photochemical Preparation of (Aza−)Indolines: Diastereoselective Synthesis and Polarity Reversal Strategy

Advanced Synthesis &Catalysis, EarlyView.
Abstract Herein, we present the first light‐mediated, diastereoselective de novo synthesis for 2,3‐substituted indolines, a privileged scaffold in pharmaceuticals. The protocol was tested with various aryl and alkyl groups, maintaining high yields up to 85% across different substituents.
Julian J. Melder, Maxi L. Heldner, Julia Svetličić, Abdinasir Adow, Frank Rominger, Matthias Rudolph, Günter Helmchen, A. Stephen K. Hashmi   +7 more
wiley   +1 more source