Results 191 to 200 of about 207,447 (300)

Spatial Orientation‐Dependent Double Hydrogen Bond/Photoredox Cooperative Catalysis in Metal–Organic Frameworks

Angewandte Chemie, EarlyView.
We report a heterogeneous double hydrogen bond/photoredox synergistic catalysis, wherein the flexibility and spatial orientation of catalytic centers, rather than catalyst activity, play a dominant role in catalytic performance. ABSTRACT Catalyst activity is typically the primary priority in designing a catalytic system. The higher catalyst activity is
Jing Ouyang, Sze Lam Lam, Chao Li, Peiqi Zhang, Le Yang, Zhiyi Yang, Teng‐Teng Chen, Xueliang Xiao, Yangjian Quan   +8 more
wiley   +1 more source

Palladium immobilized on CdFe₂O₄ as highly efficient, reusable, and organic-inorganic hybrid catalyst for the synthesis of pyridine derivatives. [PDF]

Discov Nano
Abushuhel M, Zaki MEA, Rekha MM, Basheer NM, Ray S, Pal A, Sharma R, Gomha SM, Singh A.   +8 more
europepmc   +1 more source

Pyridine C─N Transposition via Cycloaddition–Cycloreversion

Angewandte Chemie, EarlyView.
Transposition of pyridine nitrogen from the 4‐ to the 3‐position is described using two open and shut sequences: a nucleophile addition ring‐open ring‐closure, followed by a nitrile Diels–Alder cycloaddition cycloreversion. The nitrogen swap is particularly effective for tertiary alkyl substituents, transforming easily accessible para‐alkylated ...
Aífe Conboy, Michael F. Greaney
wiley   +1 more source

Crystal structures of (<i>S</i>)-3-{1-[(4-chloro-phen-yl)sulfon-yl]piperidin-2-yl}pyridine, (<i>S</i>)-3-[1-(4-methyl-phen-yl)piperidin-2-yl]pyridine, (<i>S</i>)-3-{1-[(4-meth-oxy-phen-yl)sulfon-yl]piperidin-2-yl}pyridine and (<i>S</i>)-3-{1-[(3,4-di-methyl-phen-yl)sulfon-yl]piperidin-2-yl}pyridine. [PDF]

Acta Crystallogr E Crystallogr Commun
Okmanov RY, Olimova MI, Yuldashova IE, Azimova GZ, Pulatova FA.   +4 more
europepmc   +1 more source

Ein reversibler 900‐nm‐Nahinfrarot‐Photoschalter für unsichtbar lichtbeschreibbare 2D‐ und 3D‐Displays

Angewandte Chemie, EarlyView.
Der peri‐benzo[a]fluoranthenthioindigo (PBFT) Photoschalter kann direkt durch Nahinfrarot‐Licht mit Wellenlängen bis zu 900 nm angeregt werden. Er bietet ein hochperformantes Eigenschaftsprofil mit kontrastreichen Farbänderungen zwischen blassgrün und tiefblau.
Elias Ciekalski, Henry Dube
wiley   +1 more source

Catalytic Enantioselective Intramolecular Aza‐Michael Addition to α,β‐Unsaturated Esters

Angewandte Chemie, EarlyView.
A general method for accessing enantioenriched saturated N‐heterocycles via a catalytic enantioselective intramolecular aza‐Michael reaction to α,β‐unsaturated esters is described. A superbasic bifunctional iminophosphorane (BIMP) catalyst was key to enabling reactivity of the high pKa sulfonamide pronucleophile, whilst delivering good to excellent ...
Evan G. W. Rutter, Cameron J. MacRae, Haoran Xiong, Daniel Rozsar, Katherine F. P. Clarke, Darren J. Dixon   +5 more
wiley   +1 more source

Chemoenzymatic Triazolopyridine Synthesis Enabled by Cryptic Diazo Formation by Vanadium-Dependent Haloperoxidases. [PDF]

Org Lett
Sharma M, Biegasiewicz KF.
europepmc   +1 more source

Geminale Difunktionalisierung von Ketonen durch C–S Bindungs‐insertion photogenerierter Donor–Donor Diazoverbindungen

Angewandte Chemie, EarlyView.
Die geminale Difunktionalisierung leicht verfügbarer Bausteine ermöglicht einen schnellen Zugang zu molekularer Komplexität. Diese Arbeit stellt eine Strategie vor, um zwei unterschiedliche funktionelle Gruppen an einem Carbonylkohlenstoff zu installieren, indem dieser in eine Donor–Donor‐Diazo‐Verbindung überführt wird. Die Methode ist sowohl im Batch‐
Vincent George, Aryaman Pattanaik, Daniel Maddox, Lukas M. Sigmund, Giovanna Mejia, Sara Pahlén, Simon O. Angerer, Maria Schmoll, Lisa Marie Schneider, Nidhal Selmi, Mikhail Kabeshov, Giulia Bergonzini, Julia Rehbein, Burkhard König   +13 more
wiley   +1 more source

Fe(III)/Pyridine N-oxide LMCT Photocatalysis for Unactivated C(sp³)-H Functionalizations. [PDF]

ACS Catal
Luo J, Pradhan DR, Singh J, Liu L, Vetticatt MJ, Deng Y.   +5 more
europepmc   +1 more source

Isolation of a Highly Reactive CBNC Heterocumulene via Azidoborylene Photolysis: Facile Access to a Crystalline Dioxaborirane

Angewandte Chemie, EarlyView.
Azidoborylene photolysis results in the isolation of a reactive C═B═N═C heterocumulene bearing an ambiphilic boron centre. Addition of 3O2 to this species results in the clean conversion to a unique example of a dioxaborirane. ABSTRACT Oxidation of the formal boron(0) complex MeCAAC2B in the presence of tetrabutylammonium azide leads to the formation ...
Hayley King, Vignesh Pattathil, William Kennedy, Robert K. Szilagyi, Conor Pranckevicius   +4 more
wiley   +1 more source