Light-induced olefin metathesis
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TLDR
This survey of the relevant literature summarises past and present developments in the use of light to expedite olefin ring-closing, ring-opening polymerisation and cross-metathesis reactions.Abstract:
Light activation is a most desirable property for catalysis control. Among the many catalytic processes that may be activated by light, olefin metathesis stands out as both academically motivating and practically useful. Starting from early tungsten heterogeneous photoinitiated metathesis, up to modern ruthenium methods based on complex photoisomerisation or indirect photoactivation, this survey of the relevant literature summarises past and present developments in the use of light to expedite olefin ring-closing, ring-opening polymerisation and cross-metathesis reactions.read more
Citations
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Regioselective Chromatic Orthogonality with Light‐Activated Metathesis Catalysts
TL;DR: The coupling of two photochemical reactions is described, one the photoisomerization and consequent activation of a sulfur-chelated latent olefin-metathesis catalyst and the other the photocleavage of a silyl protecting group at 254 nm, which demonstrates the selective formation of either five- or six-membered-ring frameworks by light-triggered ring-closing metathesis.
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Light- and Thermal-Activated Olefin Metathesis of Hindered Substrates
Elisa Ivry,Alexander Frenklah,Yakov Ginzburg,Efrat Levin,Israel Goldberg,Sebastian Kozuch,N. Gabriel Lemcoff,Eyal Tzur +7 more
TL;DR: In this article, the S-chelated ruthenium precatalyst Tol-SCF3 was shown to be capable of promoting olefin metathesis of demanding substrates upon light stimulation at room temperature.
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Remote Control Grubbs Catalysts That Modulate Ring-Opening Metathesis Polymerizations
TL;DR: A broad range of stimuli, including light, heat, mechanical force, or changes in chemical potential, may be used to toggle Ru-based catalysts between multiple distinct states of activity as mentioned in this paper.
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Tailored molybdenum imido alkylidene N -heterocyclic carbene complexes as latent catalysts for the polymerization of dicyclopentadiene
TL;DR: In this article, three molybdenum imido alkylidene N-heterocyclic carbene (NHC) pre-catalysts are presented, that is, Mo(N-t-Bu)(1-(2,6-diisopropylphenyl)-3-iso-propyl-4-phenyl-1H-1,2,3-triazol-5-ylidene)(CHCMe2Ph)(OTf)2 (I1, OTf, t-BuO) (
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Synthesis and Catalytic Properties of Sulfur-Chelated Ruthenium Benzylidenes Bearing a Cyclic (Alkyl)(amino)carbene Ligand
Illya Rozenberg,Or Eivgi,Alexander Frenklah,Danielle Butilkov,Sebastian Kozuch,Israel Goldberg,N. Gabriel Lemcoff +6 more
TL;DR: In this paper, the steric bulk of the CAAC ligand by using different substitution patterns was shown to affect the geometry of the complexes produced and determined whether the complexes could be catalytically dormant.
References
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The Development of L2X2RuCHR Olefin Metathesis Catalysts: An Organometallic Success Story
Tina M. Trnka,Robert H. Grubbs +1 more
TL;DR: The discussion includes an analysis of trends in catalyst activity, a description of catalysts coordinated with N-heterocyclic carbene ligands, and an overview of ongoing work to improve the activity, stability, and selectivity of this family of L2X2Ru=CHR complexes.
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Synthesis and activity of a new generation of ruthenium-based olefin metathesis catalysts coordinated with 1,3-dimesityl-4,5-dihydroimidazol-2-ylidene ligands.
TL;DR: These air- and water-tolerant complexes were shown to exhibit an increased ring-closing metathesis activity at elevated temperature when compared to that of the parent complex 2 and the previously developed complex 3.
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Olefin Metathesis and Beyond
TL;DR: In this paper, the authors provide an overview of the development of catalysts for olefin metathesis which combine high activity, durability, and excellent tolerance towards polar functional groups.
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Self-healing materials with microvascular networks
TL;DR: A self-healing system capable of autonomously repairing repeated damage events via a three-dimensional microvascular network embedded in the substrate is reported, opening new avenues for continuous delivery of healing agents for self-repair as well as other active species for additional functionality.
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Living ring-opening metathesis polymerization
TL;DR: A review of living ring-opening metathesis polymerization (ROMP) reactions can be found in this article, along with a discussion of state-of-the-art catalysts for use in living ROMP reactions as well as opportunities for the future.