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Alternating Terpolymers through Cyclopolymerization and Subsequent Orthogonal Functionalization

A method for the synthesis of functionalized alternating copolymers by reversible deactivation radical polymerization was developed. Copolymerization by reversible addition-fragmentation chain transfer of hexenyl vinyl ether with a novel fluorinated divinyl monomer yields alternating cyclopolymers that can be chemoselectively modified by three distinct...

Intramolecular C−H Activation as an Easy Toolbox to Synthesize Pyridine‐Fused Bipolar Hosts for Blue Organic Light‐Emitting Diodes

The development of high-performance blue organic light-emitting diodes (OLEDs) remains a challenging task. While exploiting new blue emitters has attracted great interest, developing host materials that considerably determine device performance obviously lags behind. Herein, we present an ease of access to the structurally diverse benzoheteroaromatic-fused...

Atroposelective Construction of Nine‐Membered Carbonate Bridged Biaryls

We herein demonstrated an efficient method for the atroposelective construction of nine-membered carbonate bridged biaryls through vinylidene ortho-quinone methide (VQM) intermediates. Diverse products with desirable pharmacological features were synthesized in satisfying yields and good to excellent enantioselectivities. In subsequent bioassays, several...

Merging the Non‐Natural Catalytic Activity of Lipase and Electrosynthesis: Asymmetric Oxidative Cross‐Coupling of Secondary Amines with Ketones

We describe the enantioselective oxidative cross-coupling of secondary amines with ketones by combining the non-natural catalytic activity of lipase with electrosynthesis. Various 2,2-disubstituted 3-carbonyl indoles with a stereogenic quaternary carbon center were synthesized from 2-substituted indoles in yields up to 78% with good enantio- and diastereoselectivities...

Synthesis of an N‐Heterocylic Boryl‐Stabilized Disilyne and its Application to the Activation of Dihydrogen and C−H Bonds

The synthesis of low-valent silicon compounds that enable the activation of small molecules has been of great current interest. Reduction of N-heterocyclic boryltribromosilane (NHB)SiBr 3 ( 2 , NHB = [ArN(CMe) 2 NAr]B, Ar = 2,6- i Pr 2 C 6 H 3 ) with three equiv. of lithium in diethyl ether yielded the NHB-stabilized disilyne (NHB)Si≡Si(NHB)...

Chemical Synthesis and Antigenic Evaluation of Inner Core Oligosaccharides from Acinetobacter baumannii Lipopolysaccharide

Four inner core oligosaccharides from the lipopolysaccharide (LPS) of A. baumannii strain ATCC 17904 were chemically synthesized (see structures). Antigenic investigation indicated that the 4,5-branched Kdo trisaccharide, a common inner core structure of A. baumannii LPS, is a potential antigenic epitope that could be used for further immunological...

Alexander Ayzner

The most important factor in the choice of my current research topic was my vision for the construction of artificial light-harvesting organelles … My biggest motivation is uncovering the unknown …“ Find out more about Alexander Ayzner in his Introducing … Profile.

Bipolar Magnetic Molecules for Spin‐Polarized Electric Current in Molecular Junctions

Electrical control of spin transport at single molecule level is highly desired for molecular nanospintronics. By exploiting magnetic bistability of spin crossover complexes, the magnitude of spin polarization can be modulated. However, efficiently controlling the direction of spin polarization at single molecule level is still challenging. Here, we...

Ultrafast Triplet–Singlet Exciton Interconversion in Narrowband Blue Organoboron Emitters Doped with Heavy Chalcogens

Narrowband emissive organoboron emitters featuring the multi-resonance (MR) effect have now become a critical material component for constructing high-performance organic light-emitting diodes (OLEDs) with pure emission colors. These MR organoboron emitters are capable of exhibiting high-efficiency narrowband thermally activated delayed fluorescence...

Green‐Light‐Driven Reductive Elimination of Chlorine from a Carbene‐Xanthylium Gold(III) Complex

With the discovery of late transition metal platforms that support clean photoreductive halogen eliminations, we now describe an indazol-3-ylidene gold trichloride complex ([ 7 ] + ) decorated at the 4-position by a xanthylium unit. This orange complex features a low energy band in the visible part of the spectrum, assigned to the charge transfer...

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