Results 71 to 80 of about 36,419 (269)
A persistent P,N-heterocyclic carbene [PDF]
Chemical Communications, 2008 Conjugate acids of cyclic (amino)(phosphino)carbenes (P-NHCs) have been prepared, and several different processes have been observed during their deprotonation, which include the formation of a metastable P-NHC, an azomethine ylide, and a bicyclic phosphirane.
Guido D, Frey +5 more
openaire +2 more sources
Well-defined silica-supported olefin metathesis catalysts [PDF]
, 2009 Two triethoxysilyl-functionalized N-heterocyclic carbene ligands have been synthesized and used to prepare the corresponding second-generation ruthenium olefin metathesis catalysts.
Allen, Daryl P. +2 more
core +1 more source
N‐heterocyclic carbene catalyzed photoenolization/Diels–Alder reaction of acid fluorides [PDF]
, 2019 The combination of light activation and N‐heterocyclic carbene (NHC) organocatalysis has enabled the use of acid fluorides as substrates in a UVA‐light‐mediated photochemical transformation previously observed only with aromatic aldehydes and ketones ...
Agrawal, Arush +6 more
core +1 more source
Nature Communications, 2021 Installation of difluoroalkyl groups while also imparting stereochemical information is mostly only possible with organocatalytic methods that activate carbonyls.
Shuai Huang +11 more
doaj +1 more source
Ring Expansion Of Alkylidenecarbenes Derived From Lactams, Lactones, And Thiolactones Into Strained Heterocyclic Alkynes: A Theoretical Study [PDF]
, 2019 Strained cycloalkynes are of considerable interest to theoreticians and experimentalists, and possess much synthetic value as well. Herein, a series of cyclic alkylidenecarbenes—formally obtained by replacing the carbonyl oxygen of four-, five-, and six ...
Just, J. +4 more
core +1 more source
Unexpected rearrangements in the synthesis of an unsymmetrical tridentate dianionic N-heterocyclic carbene [PDF]
, 2013 Starting from the same ethylenediamine species, three valuable carbene precursors were synthesized under differing conditions: a tridentate dianionic N-heterocyclic carbene bearing an aniline, a phenol and a central dihydroimidazolium salt, its ...
Bercaw, John E. +6 more
core +1 more source
Aerobic Oxidative N‐Heterocyclic Carbene Catalysis
The Chemical Record, 2023 AbstractThe ease with which simple starting materials can be transformed into highly functionalized products has made oxidative N‐heterocyclic carbene (NHC) catalysis an area of significant interest. However, the use of stoichiometric amounts of high molecular weight oxidants in most reactions generates an undesired equivalent amount of waste.
Simon Stenkvist +3 more
openaire +2 more sources
Half-Sandwich Ir(III) and Os(II) Complexes of Pyridyl-Mesoionic Carbenes as Potential Anticancer Agents [PDF]
, 2019 A series of cationic chlorido arene-iridium(III) and arene-osmium(II) complexes with bidentate pyridyl functionalized mesoionic carbenes (MIC) of the 1,2,3-triazol-5-ylidene type have been prepared.
Bolje, Aljoša +12 more
core +1 more source
N-Heterocyclic carbene/Brønsted acid cooperative catalysis as a powerful tool in organic synthesis
Beilstein Journal of Organic Chemistry, 2012 The interplay between metals and N-heterocyclic carbenes (NHCs) has provided a window of opportunities for the development of novel catalytic strategies within the past few years.
Rob De Vreese, Matthias D’hooghe
doaj +1 more source
Communications Chemistry, 2022 N-heterocyclic carbenes are widely exploited as ligands in transition metal catalysis, but are largely limited to N-arylimidazolylidenes. Here, the authors report on the steric and electronic properties of thiazol-2-ylidenes, demonstrating that their ...
Jin Zhang +10 more
doaj +1 more source