Results 41 to 50 of about 35,108 (280)

Stable Carbenes as Structural Components of Partially Saturated Sulfur-Containing Heterocycles

Molecules, 2022
Recently, an unusual elongation of the C-S bond was observed experimentally for some sulfur-containing heterocycles. Using a superior ab initio (SCS-MP2/cc-pVTZ) level of theory, we showed that the phenomenon can be explained by a contribution of a donor–
Alexander B. Rozhenko, Yuliia S. Horbenko, Andrii A. Kyrylchuk, Evgenij V. Zarudnitskii, Sergiy S. Mykhaylychenko, Yuriy G. Shermolovich, Andriy V. Grafov   +6 more
doaj   +1 more source

Carbene Catalysts [PDF]

, 2009
The use of N-heterocyclic carbenes as catalysts for organic transformations has received increased attention in the past 10 years. A discussion of catalyst development and nucleophilic characteristics precedes a description of recent advancements and new reactions using N-heterocyclic carbenes in catalysis.
Tomislav Rovis, Jennifer L. Moore
openaire   +3 more sources

Asymmetric Strategies for the Synthesis of Enantiopure α‐/β‐/γ‐Thio‐Carboxylic Acids Bearing a Stereocentre at CS Bond

Advanced Synthesis &Catalysis, EarlyView.
Enantioenriched α‐/β‐/γ‐thiocarboxylic acids featuring C–S chirality are valuable targets in organic synthesis. This review outlines recent progress in their asymmetric synthesis, including chiral pool approaches, metal‐ /organo‐catalysis, and emerging biocatalytic strategies. Enantiomerically pure α‐/β‐/γ‐thiocarboxylic acids bearing a stereocentre at
Jingyue Wu, Daniele Castagnolo
wiley   +1 more source

C-H Functionalization via Iron-Catalyzed Carbene-Transfer Reactions

Molecules, 2020
The direct C-H functionalization reaction is one of the most efficient strategies by which to introduce new functional groups into small organic molecules.
Claire Empel, Sripati Jana, Rene M. Koenigs   +2 more
doaj   +1 more source

A step-for-step main-group replica of the Fischer carbene synthesis at a borylene carbonyl

Nature Communications, 2023
The Fischer carbene synthesis, involving the conversion of a transition metal (TM)-bound CO ligand to a carbene ligand of the form [=C(OR’)R] (R, R’ = organyl groups), is one of the seminal reactions in the history of organometallic chemistry.
Marcel Härterich, Alexander Matler, Rian D. Dewhurst, Andreas Sachs, Kai Oppel, Andreas Stoy, Holger Braunschweig   +6 more
doaj   +1 more source

Water‐Catalytic Deconstructive and Proton Transfer Cyclopropanation of Sulfoxonium Ylide with Olefin

Advanced Science, EarlyView.
Water‐catalytic deconstructive and proton transfer cyclopropanation of sulfoxonium ylide with olefin is developed through a sequential water‐mediated ring‐closing/opening reaction. This atom‐economical, environmentally friendly methodology offers easy access to a range of cyclopropyl ketones with moderate to good yields.
Xianglin Yu, Liuting Huang, Haiyue Yang, Lijuan Song, Yi Jin   +4 more
wiley   +1 more source

Organocatalytic C─O Bond Cleavage and Asymmetric Transformations via [1,3]‐Sigmatropic Rearrangement

Advanced Science, EarlyView.
A direct asymmetric strategy for fulfilling the functional group transfer by aryl ether cleavage and migration is developed, representing the first Brønsted base‐catalyzed asymmetric [1,3]‐sigmatropic rearrangement reaction. The resulting chiral benzofuran products generated through this strategy exhibit significant 3D‐dimensionality and demonstrate ...
Lei Peng, Yu Chang, Liangchen Yin, Jinbang Zhang, Xuli Feng, Pengfei Wang, Wenling Qin, Hailong Yan   +7 more
wiley   +1 more source

SuFEx‐Enabled Catalytic Synthesis of Fluorescent Organosulfur Polymers for the Rapid Detection of Explosives

Advanced Science, EarlyView.
Rapid detection of explosives is essential for public safety and national security. Here, conjugated polymers (SPs), incorporating pentiptycene with organosulfur side chains, have been reported using sulfur(VI)‐fluoride exchange (SuFEx). The SP‐7 polymer exhibited exceptional fluorescence quenching (>99% in 60 s) for detecting nitroaromatic explosives.
Sun Bu Lee, Jaeyoung Heo, Seunghyun Noh, Tae Eun An, Gyeongsoo Kim, Gang Min Lee, Junggong Kim, Keunyoung Kim, Jongman Lee, Taeyeon Kim, Changsik Song, Han Yong Bae   +11 more
wiley   +1 more source

Transition-Metal-Catalyzed Directed C–H Bond Functionalization with Iodonium Ylides: A Review of the Last 5 Years

Molecules
Transition-metal-catalyzed directed C–H functionalization with various carbene precursors has been widely employed for constructing a wide range of complex and diverse active molecules through metal carbene migratory insertion processes.
Juting Liao, Dulin Kong, Xiaoyang Gao, Ruirui Zhai, Xun Chen, Shuojin Wang   +5 more
doaj   +1 more source

Maneuvering Charge Transport via Insulating Polymer Interface for Steering Photoredox Catalysis

Advanced Science, EarlyView.
Non‐conjugated insulating polymer functions as an electron‐capturing mediator to boost interfacial charge transfer and separation, contributing to considerably enhanced photocatalytic selective organic transformation and solar CO2 conversion under visible light irradiation. Abstract Maneuvering precise and tunable charge transportation has remained the
Qiao‐Ling Mo, Rui Xiong, Bo‐Yuan Ning, Peng Su, Qing Chen, Jun‐Hao Dong, Bai‐Sheng Sa, Jing‐ying Zheng, Yue Wu, Fang‐Xing Xiao   +9 more
wiley   +1 more source