Results 31 to 40 of about 10,092 (232)

Catalyst Hide‐and‐Seek Beneath Porous Support Surfaces: Pinpointing Active Site Distribution Through Resonance Energy Transfer

Angewandte Chemie, EarlyView.
Like a shark playing hide‐and‐seek in a coral reef, energy transfer (ET) finds hidden “fish” catalysts in the porous support “reef.” ET allows catalytic species to be precisely mapped, revealing whether they reside near the surface, deep in the pores, or are uniformly distributed. This approach ensures controlled catalyst distribution, highlighting how
Buddhima K. P. Maldeni Kankanamalage, William J. Thompson, Danielle N. Smith, Grace C. Thaggard, Namodhi Wijerathne, Isabella Incognito, Jeffery A. Byers, Jia Niu, Natalia B. Shustova   +8 more
wiley   +2 more sources

Universal promotion of heterogeneous olefin metathesis catalysts by controlling dynamic active site renewal

, 2021
Olefin metathesis is a versatile strategy for large-scale olefin interconversion, yet mechanistic details over industrial heterogeneous catalysts have remained ambiguous for decades.
Ka Wing, Chan, Jong Hun , Kang, John R., Di Iorio, Christophe, Copéret, Daniel F., Consoli, Sohel K., Shaikh, Ran, Zhu, Terry Z. H. , Gani, Zachariah J., Berkson, Yuriy, Román-Leshkov   +9 more
core   +1 more source

Catalytic Functionalization of Unactivated π‐Bonds Enabled by Bidentate Directing Auxiliaries

Angewandte Chemie, EarlyView.
This review explores how bidentate directing auxiliaries have advanced transition‐metal catalysis for unactivated alkene/alkyne functionalization. By leveraging chelated intermediates, bidentate directing auxiliaries enable precise hydrofunctionalization, difunctionalization, and C─H activation of π‐bonds with unique selectivity and reactivity.
Seunghyeon Cho, Al Vicente Riano D. Lisboa, Juntao Sun, Taeho Kang, Keary M. Engle   +4 more
wiley   +2 more sources

Synthesis of Tetrasubstituted Alkenes via Metathesis

Molecules, 2012
Fully substituted olefin generation via metathesis is presented. Catalyst development, optimization of reaction conditions and substrate screening are included.
Seung-Mann Paek
doaj   +1 more source

Heavier Alkyne‐Ni0 Complexes, [R2E2·Ni] (E = Sn, Pb), Exhibiting σ‐Complex Character

Angewandte Chemie, EarlyView.
Using a reductive group elimination strategy, heavier alkyne (LEEL; E = Sn, Pb) complexes of Ni0 are accessed. In contrast to classical alkyne coordination, these systems are best described as σ‐complexes, driven by ligand‐induced constraints and the established poor π‐bonding in heavier alkyne analogues.
Leopold Junge, Emeric Schubert, Israel Fernández, Terrance J. Hadlington   +3 more
wiley   +2 more sources

DFT Investigation into the Role of Conventional and Ionic Liquids as Solvents in Olefin Metathesis

International Journal of Electrochemical Science, 2013
The effects of conventional and ionic liquids on the metathesis of olefin have been investigated by means of quantum chemical calculations to establish the factors favouring the metathesis of olefin in ionic liquid. The results suggest that ionic liquids
Priya A. Thomas, Mwadham M. Kabanda, Eno E. Ebenso   +2 more
doaj   +1 more source

Olefin metathesis for chemical biology [PDF]

Current Opinion in Chemical Biology, 2008
Chemical biology relies on effective synthetic chemistry for building molecules to probe and modulate biological function. Olefin metathesis in organic solvents is a valuable addition to this armamentarium, and developments during the previous decade are enabling metathesis in aqueous solvents for the manipulation of biomolecules.
Joseph B, Binder, Ronald T, Raines
openaire   +2 more sources

Dual Activation of H2 and CO2 by a Pincer‐Type Ni–Zn Heterobimetallic Complex

Angewandte Chemie, EarlyView.
A bimetallic Ni−Zn complex performs sequential activations of H2 (1 equiv) and CO2 (2 equiv). This bimetallic cooperativity is attributed to the weak Lewis acidic nature of Zn(II), which promotes fluxional ligand binding. Namely, an X‐type ligand at Ni, where X is hydride or formate, toggles between two different binding modes: bridging Zn(μ‐X)Ni and ...
Krishnendu Dey, Matthias Borowski, Gregor Schnakenburg, Connie C. Lu   +3 more
wiley   +2 more sources

Probing the Electronic Structure of Spectator Oxo Ligands by 17O NMR Spectroscopy

CHIMIA, 2020
Spectator oxo ligands are ubiquitous in catalysis, in particular in olefin epoxidation and olefin metathesis. Here we use computationally derived 17O NMR parameters to probe the electronic structure of spectator oxo ligands in these two reactions.
Christopher P. Gordon, Christophe Copéret   +1 more
doaj   +1 more source

Syntheses and activities of indol-2-ylidene-ligated ruthenium-based olefin metathesis catalysts

, 2022
Here we report a new family of indol-2-ylidene (IdY)-ligated Ru-based olefin metathesis catalysts (Ru−IdY) and their X-ray crystal structures which show a unique conformation of the ruthenium environment.
Hyunho, Kim, Eunsung, Lee, Minseop, Kim, Sukwon, Hong, Seyong, Kim   +4 more
core   +1 more source