Results 41 to 50 of about 14,653 (264)
Enantioselective [3+3] atroposelective annulation catalyzed by N-heterocyclic carbenes
Nature Communications, 2018 Axially chiral compounds are commonly found in nature. Here, the authors show the highly enantioselective construction of axially chiral biaryls via an N-heterocyclic carbenes-catalyzed [3+3] atroposelective annulation of ynals with cyclic 1,3-diones.
Changgui Zhao +5 more
doaj +1 more source
NHC in Imidazolium Acetate Ionic Liquids: Actual or Potential Presence? [PDF]
, 2018 Ionic liquids (ILs) are considered in the majority of cases green solvents, due to their virtually null vapor pressure and to the easiness in recycling them.
Chiarotto, Isabella +4 more
core +2 more sources
The Far Side of Carboranes: Anticancer Active Monocations and Ambiently Stable Dications
Angewandte Chemie, EarlyView.This work describes the synthesis of bench‐stable dicationic carboranes. Their enhanced electrophilicity is documented by opening the clusters with weak nucleophiles or dihydrogen. The surprising stability of positively charged carboranes in water enabled a study of their in vitro antiproliferative activity, which surpassed the effects of doxorubicin ...
Vlastimil Němec +10 more
wiley +2 more sources
NHC-catalysed highly selective aerobic oxidation of nonactivated aldehydes
Beilstein Journal of Organic Chemistry, 2013 This publication describes a highly selective oxidation of aldehydes to the corresponding acids or esters. The reaction proceeds under metal-free conditions by using N-heterocyclic carbenes as organocatalysts in combination with environmentally friendly ...
Lennart Möhlmann +2 more
doaj +1 more source
Molecules, 2016 A series of C2-symmetric chiral benzimidazolium salts, the precursor of N-heterocyclic carbene ligands, were designed and synthesized from 1,2-dibromobenzene.
Weiping He +7 more
doaj +1 more source
Diazo Transfer From Nitrous Oxide Employing Phosphorus Ylides
Angewandte Chemie, EarlyView.A phosphorus ylide‐mediated strategy achieves the direct fixation of nitrous oxide (N2O) to access diazo compounds, which after intra‐ or intermolecular trapping, afford N2‐containing organic building blocks. This approach provides an alternative to hazardous diazo‐transfer reagents and establishes N2O fixation as a sustainable methodology.
Jhen‐Kuei Yu +4 more
wiley +2 more sources
Química Nova, 2008 N-heterocyclic carbenes (NHCs) have become of considerable importance in modern organometallic chemistry and homogeneous catalysis. There are several advantages in the use NHCs over their phosphorus analogues, which explains the enormous development of ...
Julio Cezar Pastre +1 more
doaj +1 more source
An update on the synthesis and reactivity of spiro-fused β-lactams [PDF]
, 2018 Beta-Lactam ring-containing compounds play a pivotal role in drug design and synthetic chemistry. Spirocyclic beta-lactams, representing an important beta-lactam subclass, have recently attracted considerable interest with respect to new synthetic ...
D'hooghe, Matthias, Dao Thi, Hang
core +1 more source
A Platinum molecular complex immobilised on the surface of graphene as active catalyst in alkyne hydrosilylation [PDF]
, 2020 A platinum complex bearing a N‐heterocyclic carbene (NHC) ligand functionalised with a pyrene‐tag is immobilised onto the surface of reduced graphene oxide (rGO).
Borja, Pilar +4 more
core +3 more sources
Ionic Liquids as Carbene Catalyst Precursors in the One-Pot Four-Component Assembly of Oxo Triphenylhexanoates (OTHOs) [PDF]
, 2015 Ionic liquids (ILs) are a convenient and inexpensive source of N-heterocyclic carbenes (NHCs). In this study, dialkyl imidazolium-based ILs are used as carbene precursors in a four-component synthesis of oxo triphenylhexanoates (OTHOs), where it was ...
Axelsson, Anton +2 more
core +5 more sources