Results 111 to 120 of about 27,695 (265)

One‐End‐Truncated Au52 and Au70 Quantum Rods: High‐Quantum‐Yield NIR‐II Emitters With Aspect‐Ratio‐Dominated Photophysics

Angewandte Chemie, EarlyView.
Two nanoclusters, Au52(PET)38 and Au70(PET)50, where PET = 2‐phenylethanethiolate, are isolated, which constitute a series of one‐end‐truncated kernel topologies. Both Au52 and Au70 exhibit NIR‐II absorption at 1032 and 1275 nm and nanosecond fluorescence at 1100 and 1360 nm, respectively, with high quantum yields (20.9% for Au52 and 14.8% for Au70 ...
Lianshun Luo, Avirup Sardar, Guiying He, Abhrojyoti Mazumder, Guoxiang Hu, Gangli Wang, Rongchao Jin   +6 more
wiley   +2 more sources

Crystal Structure of 4′-Phenyl-1′,4′-Dihydro-2,2′:6′,2″-Terpyridine: An Intermediate from the Synthesis of Phenylterpyridine

Crystals
The intermediate compound 4′-phenyl-1′,4′-dihydro-2,2′:6′,2″-terpyridine (pdhtpy) was isolated for the first time during the synthesis of 4′-phenyl-2,2′:6′,2″-terpyridine (ptpy) and characterised by single-crystal X-ray diffraction.
Alexander Sedykh, Maksim Zhernakov, Mariia Becker, Dirk G. Kurth, Klaus Müller-Buschbaum   +4 more
doaj   +1 more source

Oxetanes in heterocycle synthesis: recent advances

Owing to their balanced ring strain and the high regioselectivity of their reactions, oxetanes have emerged as versatile building blocks for heterocycle synthesis.
Wang, Yangpeng, Huang, Hai, Liu, Shuxuan, Sun, Jianwei, Liu, Gonghan   +4 more
core   +1 more source

A highly fluorescent PN-heterocycle-fused pyrene derivative with strong self-dimerisation through hydrogen bonding

, 2019
The pyrene moiety has been utilised in a variety of systems that exhibit either ‘turn on’ or ‘turn off’ fluorescence in response to specific analytes.
Lev N. Zakharov (1303344), Michael M. Haley (1339635), Chun-Lin Deng (1789242), Darren W. Johnson (1327815), Jeremy P. Bard (6812615), Jenna L. Mancuso (7301663)   +5 more
core   +1 more source

Catalyst‐Specialized Chemical Language Model Based on Transformer Variational Autoencoder for Catalyst Design and Discovery

Advanced Intelligent Discovery, EarlyView.
We present CatTransVAE, a catalyst‐specialized chemical language model (CLM) built on a transformer variational autoencoder (VAE), developed through pretraining on general compounds followed by fine‐tuning on diverse catalyst databases. A template‐guided generation framework is introduced to enable controlled catalyst design under structural ...
Apakorn Kengkanna, Masahito Ohue
wiley   +1 more source

P‐Directed and Lewis Acid‐Assisted Pd‐Catalyzed Si─Me Bond Activation Enabling Alkyl Exchange at Silicon

Angewandte Chemie, EarlyView.
A new type of Si─Me bond activation enabling catalytic alkyl exchange at Si was developed. It involves a P‐directing group and Pd─Lewis acid cooperation. It enables the conversion of Me3SiCl into silanols with three different organic substituents. ABSTRACT A novel mode of Si─Me bond activation has been unveiled through the cooperative action of a P ...
Hajime Kameo, Kanta Oishi, Keitaro Yamanaka, Akihiro Mushiake, Hiroyuki Matsuzaka, Didier Bourissou   +5 more
wiley   +2 more sources

Second‐Sphere Aromatic Substitutions That Tune H‐Atom Transfer Reactivity Observed for a Series of S = 1 Nonheme FeIV=O Complexes: An Enthalpy‐Entropy Compensation Effect

Angewandte Chemie, EarlyView.
A series of oxoiron(IV) complexes was synthesized to determine the impact of electronically tuned aromatic substitution in the secondary sphere of the ligand. Despite possessing identical electronic properties, they show significant differences in C─H oxidation reactions.
Abhishek Das, Jin Xiong, Victor G. Young Jr., Yisong Guo, Marcel Swart, Lawrence Que Jr.   +5 more
wiley   +2 more sources

Cysteine Thioaldehydes: Photolytic Generation, Reactivity, and Biological Implications

Angewandte Chemie, EarlyView.
Photolysis of cysteine phenacylsulfides bearing non‐conjugating electron‐withdrawing substituents leads to high conversions into cysteine thioaldehydes through a Norrish type‐II pathway. This methodology enabled the study of the aqueous reactivity of these important biosynthetic intermediates, which, depending on peptide sequence, pH and buffer ...
Ardra Karthika, Matthew Murray, Guillermo Palop, Lee‐Ann J. Keane, Patrick McArdle, Nicholas D. J. Yates, Christopher D. Spicer, Alison Parkin, Martin A. Fascione, Eddie L. Myers   +9 more
wiley   +2 more sources

Direct Access to Chiral Piperidines by Enantioselective HAT‐Initiated C(sp3)─H Oxidation

Angewandte Chemie, EarlyView.
The direct desymmetrization of piperidines is achieved through manganese‐catalyzed enantioselective α‐C(sp3)─H oxidation with hydrogen peroxide, affording versatile chiral N,O‐acetals in good yields and with high enantio‐ and diastereoselectivity. These intermediates provide access to diverse functionalized piperidines with retention of chirality ...
Sethuraman Muthuramalingam, Josep M. Luis, Arnau Call, Quentin Lefebvre, Matthew S. Sigman, Miquel Costas   +5 more
wiley   +2 more sources

Enhancement of Dissymmetry Factors Through Axial Elongation of Hetero[n]helicenes

Angewandte Chemie, EarlyView.
A benzofuran scaffolding strategy enables the synthesis of hetero[9]‐, [12]‐, and [15]helicenes. Structural and chiroptical analyses demonstrate that systematic axial elongation increases helical distortion and significantly amplifies luminescence dissymmetry.
Jeppe S. Mogensen, Christoffer Bræstrup, Christoffer Warming, Georg I. Junker, Yann Lie, Mathias Hermann, Kurt V. Mikkelsen, Michael Pittelkow   +7 more
wiley   +2 more sources