Results 81 to 90 of about 10,092 (232)
Metathesis access to monocyclic iminocyclitol-based therapeutic agents
Beilstein Journal of Organic Chemistry, 2011 By focusing on recent developments on natural and non-natural azasugars (iminocyclitols), this review bolsters the case for the role of olefin metathesis reactions (RCM, CM) as key transformations in the multistep syntheses of pyrrolidine-, piperidine ...
Ileana Dragutan +5 more
doaj +1 more source
Chemistry – A European Journal, EarlyView.Efficient cationic gold(I)‐catalyzed intermolecular cyclopropanation of 7‐alkynylnorbornadiene derivatives has been developed. This methodology offers the synthesis of a new class of norbornene derivatives in high yield with excellent diastereoselectivity.
Kento Ishida +3 more
wiley +1 more source
, 2019 We report a catalytic tandem process involving a ring-closing carbonyl-olefin metathesis and a transfer hydrogenation. 1,4-Cyclohexadiene has been used as H2 surrogate to reduce the cyclic alkenes formed after the metathesis step. The same NHC-stabilized
Vincent, Gandon +6 more
core +1 more source
Molecularly defined lubricant hydrocarbons from olefin metathesis
, 2023 Hydrocarbon-based lubricants are ubiquitous in industrial applications but are typically complex mixtures of branched molecules that are challenging to characterize and to relate to their macroscopic properties.
Roland, Riek +9 more
core +1 more source
A Hoveyda–Grubbs‐Type Olefin Metathesis Catalyst Bearing a Fluorinated Unsymmetrical NHC Ligand
European Journal of Inorganic Chemistry, EarlyView.A fluorinated unsymmetrical NHC ruthenium complex was synthesised and employed as a catalyst for olefin metathesis reactions. The modification of the steric and electronic properties of the NHC ligand through the introduction of fluorine substituents results in improved activity but lower selectivity compared to the analogous non‐fluorinated NHC ...
Rubina Troiano +3 more
wiley +1 more source
The activation mechanism of Fe-based olefin metathesis catalysts
, 2014 Density functional theory calculations have been used to describe the first turnover for olefin metathesis reaction of a homogenous Fe-based catalyst bearing a N-heterocyclic carbene ligand with methoxyethene as a substrate.
Vummaleti, Sai Vikrama Chaitanya +5 more
core +1 more source
Revisit to ()-Civetone Synthesis
Natural Product Communications, 2012 The synthesis of ( Z )-civetone ( 1 ) is described starting from oleic acid ( 5 ) via a series of reactions, intermolecular olefin self-metathesis, bromination/dehydrobromination into acetylene, semi-hydrogenation and intramolecular Dieckmann ...
Hisahiro Hagiwara +4 more
doaj +1 more source
A bis-calixarene from olefin metathesis
Acta Crystallographica Section E, 2012 A ring-closing olefin metathesis reaction of tetrakis(allyloxy)calix[4]arene gave the bis calixarene, (15E,40E,60E)-65,74-bis(prop-2-en-1-yloxy)-13,18,38,43,58,63-hexaoxadodecacyclo[28.26.8.720,36.111,45.151,55.05,57.07,12.019,24.026,64.032,37.044,49.168,
Shimelis T. Hailu +3 more
doaj +1 more source
European Journal of Organic Chemistry, EarlyView.The intramolecular nitrile oxide olefin [3 + 2]‐cycloaddition offers a reliable entry toward 2‐aza‐bicyclo[4.3.0]‐nonanes, a substructure found in several bioactive piperidine alkaloids. The required oxime precursors were prepared in non‐racemic form by Ir‐catalyzed asymmetric allylation and ring‐closing metathesis.
Alicia Köcher +5 more
wiley +1 more source
Beilstein Journal of Organic Chemistry, 2019 The influence of microwave and ultrasonic irradiation on the performance of ammonium-tagged Ru-based catalysts in olefin metathesis transformations in aqueous media was studied.
Łukasz Gułajski +5 more
doaj +1 more source