Results 241 to 250 of about 403,555 (400)

An ignition delay time and chemical kinetic modeling study of the pentane isomers

, 2016
J. Bugler, B. Marks, O. Mathieu, R. Archuleta, Alejandro Camou, C. Grégoire, K. Heufer, E. Petersen, H. Curran   +8 more
semanticscholar   +1 more source

Consequences of Medium‐Pore Zeolite Constraints for Alkene Cracking—The Case of n‐Pentene

Angewandte Chemie, EarlyView.
Alkene cracking in medium‐pore zeolites is governed by a balance of enthalpic and entropic effects. Intrinsic barriers are quantified and shown to be lower than for alkanes due to stabilization of carbenium‐ion‐like transition states. Confinement and extra‐framework aluminum modulate reactivity by tuning transition‐state energetics, providing a ...
Ruixue Zhao, Stefan Schallmoser, Gary L. Haller, Maricruz Sanchez‐Sanchez, Johannes A. Lercher   +4 more
wiley   +1 more source

Substrate‐Controlled Enantiodivergence in Ni‐Catalyzed Access to Phosphorylated Oxindoles With Quaternary Stereocenters

Angewandte Chemie, EarlyView.
An efficient, enantiodivergent synthesis of phosphorylated oxindoles with quaternary stereocenters is achieved via a nickel‐catalyzed intermolecular Heck‐phosphorylation cascade. Employing a single chiral catalyst, either product enantiomer is selectively accessed simply by changing the alkene leaving group. DFT calculations trace this stereodivergence
Haimeng Zhu, Lewen Wang, Shihui Luo, Xinglong Zhang, Jun (Joelle) Wang   +4 more
wiley   +1 more source

Towards helical-chirality-controlled molecular motors. [PDF]

Chem Sci
Gisbert Y, Sidler E, Feringa BL.
europepmc   +1 more source

Light and Dark Cycles Control the Structural Evolution of Photoresponsive Supramolecular Systems

Angewandte Chemie, EarlyView.
Here, we report a photoswitchable synthetic peptide that, under light energy cycles, exhibits supramolecular polymorphism coupled to darkness‐driven structural self‐selection. We demonstrate that light sustains a transient assembled state in the form of helical nanoribbons, hindering the system from undergoing a transition to the disassembled state ...
Alejandro Méndez‐Ardoy, Nicolas Cissé, Adrian Sanchez‐Fernandez, Patricia Fulias‐Guzmán, Marc C. A. Stuart, Tibor Kudernac, Javier Montenegro   +6 more
wiley   +1 more source

Differentiation of disaccharide isomers <i>via</i> diagnostic-ion-weighted spectral library searching using data from tandem MS analysis of chloride adducts.

Analyst
Xu S, Acharya SR, Speidel RM, Badu-Tawiah AK.   +3 more
europepmc   +1 more source

Structure and isomer-specific femtosecond real-time relaxation dynamics of hydrated electron motifs in water cluster anions. [PDF]

Commun Chem
An S, Kim SK.
europepmc   +1 more source

A New Method for the Synthesis of Stipitatic Acid Isomers: Photooxygenation of Ethyl 6H-Cyclohepta[d][1,3]dioxole-6-carboxylate

, 2001
Arif Daştan, Nurullah Saraçoğlu, Metin Balcı   +2 more
openalex   +2 more sources

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

De novo determination of fucose linkages in N-glycans using logically derived sequence tandem mass spectrometry. [PDF]

Glycoconj J
Chen JL, Tseng HW, Lin CC, Ni CK.
europepmc   +1 more source