Results 11 to 20 of about 20,349 (227)

Ruthenium-Based Heterocyclic Carbene-Coordinated Olefin Metathesis Catalysts [PDF]

open access: yesChemical Reviews, 2010
The fascinating story of olefin (or alkene) metathesis (eq 1) began almost five decades ago, when Anderson and Merckling reported the first carbon-carbon double-bond rearrangement reaction in the titanium-catalyzed polymerization of norbornene.
Grubbs, Robert H.   +1 more
core   +3 more sources

Recent Advances in Olefin Metathesis [PDF]

open access: yesMolecules, 2016
Olefin metathesis is one of the most significant developments of the last 20 years in the fields of organic chemistry, polymers synthesis, and materials science [1–7]. [...]
Georgios C. Vougioukalakis
doaj   +4 more sources

A Convenient, Safe, and Atom-Economical Route to a Large Portfolio of Grubbs-Type Catalysts for Olefin Metathesis via Four-Coordinate Ruthenium Alkylidynes. [PDF]

open access: yesAngew Chem Int Ed Engl
It may seem counterintuitive to first target a ruthenium alkylidyne when Grubbs‐type ruthenium carbene complexes are the actual goal. In the end, however, this tactic pays valuable dividends in terms of practicality, atom economy, flexibility as well as safety: the new route provides ready access to a large assortment of catalysts for alkene metathesis
Cui M, Fürstner A.
europepmc   +3 more sources

A Review on Olefin Metathesis Reactions as a Green Method for the Synthesis of Organic Compounds

open access: yesJournal of Chemistry, 2021
Olefin metathesis is a metal-mediated C-C bond exchange by which the two fragments within the olefin precursor are redistributed as a result of breaking the double bond to obtain a new product. Currently, most of the synthetic organic compounds, polymers,
Atitegeb Abera Tsedalu
doaj   +1 more source

Research progress in preparation technology of hydroxyl-terminated butadiene liquid rubber

open access: yesHecheng xiangjiao gongye, 2023
The performance characteristics and application fields of hydroxy-terminated polybuta-diene (HTPB) liquid rubber were summarized, the preparation methods and characteristics of HTPB were reviewed with 32 references, and various me-thods were summarized ...
LIU Sheng-nan1,2, AI Chun-jin1,2, ZHANG Ding-jun1,2, LI Dong1,2
doaj   +1 more source

"Progress in preparation of end-group functionalized liquid rubber

open access: yesHecheng xiangjiao gongye, 2022
The preparation of end-group functionalized liquid rubber by olefin metathesis method had the advantages of controllable molecular weight, easy introduction of multiple functional groups and milder reaction conditions.
ZHANG Yi-kai, LI Wei-tian, ZHANG Hua-qiang, RAN Fen, GONG Guang-bi
doaj   +1 more source

Ruthenium Olefin Metathesis Catalysts Featuring N-Heterocyclic Carbene Ligands Tagged with Isonicotinic and 4-(Dimethylamino)benzoic Acid Rests: Evaluation of a Modular Synthetic Strategy

open access: yesMolecules, 2021
A modular and flexible strategy towards the synthesis of N-heterocyclic carbene (NHC) ligands bearing Brønsted base tags has been proposed and then adopted in the preparation of two tagged NHC ligands bearing rests of isonicotinic and 4-(dimethylamino ...
Stefan Czarnocki   +4 more
doaj   +1 more source

Heterogeneous catalysts for olefin metathesis

open access: yesCatalysis Communications, 2023
Over the past 30 years, many strategies have been developed to immobilize well-defined metathesis catalysts on solid supports. The use of heterogeneous catalysis resulted in increased purity of the product and the possibility of recycling the catalyst ...
Natalia Barteczko   +2 more
doaj   +1 more source

Enantioselective Synthesis of 5-epi-Citreoviral Using Ruthenium-Catalyzed Asymmetric Ring-Closing Metathesis [PDF]

open access: yes, 2009
Chiral ruthenium olefin metathesis catalysts can perform asymmetric ring-closing reactions in ≥90% ee with low catalyst loadings. To illustrate the practicality of these reactions and the products they form, an enantioselective total synthesis of 5-epi ...
Funk, Timothy W.
core   +2 more sources

Facile Synthesis of Effcient and Selective Ruthenium Olefin Metathesis Catalysts with Sulfonate and Phosphate Ligands [PDF]

open access: yes, 2010
A series of novel, air-stable ruthenium NHC catalysts with sulfonate and phosphate anions have been prepared easily in one pot at high yields using commercially available precursors.
Grubbs, Robert H., Teo, Peili
core   +1 more source

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