Journal ArticleDOI
W(CO)6/CBr4/hv — a new system for metathesis polymerisation
B Gita,G. Sundararajan +1 more
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In this paper, an optimization study of W(CO) 6 CBr 4 / hv is presented, where the active species are characterised by reaction with acetophenone and copolymers of phenylacetylene and norbornene.Abstract:
Metathesis polymerisation can be effected with many catalysts under a variety of conditions. The system described here, viz., W(CO) 6 CBr 4 / hv , induces polymerisation by in situ generation of the active species and has not been reported in the literature so far. In this paper, optimisation studies of this system, yields obtained with various monomers and characterisation of the active species are discussed. Variation of different parameters such as the ratio of W(CO) 6 :CBr 4 , the time of photolysis and the effect of solvents as well as that of the metal carbonyls have been studied. In addition, copolymers of phenylacetylene and norbornene have been synthesised. We have also attempted to characterise the active species responsible for the polymerisation by reaction with acetophenone.read more
Citations
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Artificial light-gated catalyst systems.
Ragnar S. Stoll,Stefan Hecht +1 more
TL;DR: This Review outlines the general concept of light-gated catalysis based on photocaged and also photoswitchable systems, and discusses relevant examples of the past and recent literature.
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Cationic RuII Complexes with N‐Heterocyclic Carbene Ligands for UV‐Induced Ring‐Opening Metathesis Polymerization
Dongren Wang,Klaus Wurst,Wolfgang Knolle,Ulrich Decker,Lutz Prager,Sergej Naumov,Michael R. Buchmeiser,Michael R. Buchmeiser +7 more
TL;DR: The development of the first thermally stable, truly UV-triggerable precatalysts for ROMP and their application in surface functionalization is reported.
Journal ArticleDOI
Künstliche lichtgesteuerte Katalysatorsysteme
Ragnar S. Stoll,Stefan Hecht +1 more
TL;DR: In this paper, the authors discuss the problem of bestrahlung in a katalytischen system, i.e., kontrolle uber einen Gegenstand oder einen gesamten Prozess, ist zweifelsohne der ultimative Beweis fur dessen Verstandnis.
Journal ArticleDOI
Alkene metathesis: new developments in catalyst design and application
TL;DR: In this paper, the information is classified in terms of type of catalysis and each type is subdivided according to the metal used, so that a reactivity pattern might emerge to guide future developments.
Journal ArticleDOI
Light-induced olefin metathesis
TL;DR: 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.
References
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Journal ArticleDOI
A novel route to block copolymers by changing the mechanism from living ring-opening metathesis polymerization of cyclic olefins to aldol condensation polymerization of silyl vinyl ethers
Wilhelm Risse,Robert H. Grubbs +1 more
TL;DR: Synthese de polynorbornene et poly(exodicyclopentadiene) avec un groupe terminal aldehyde par polymerisation puis reaction avec le terephtalaldehyde as discussed by the authors.
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Block and graft copolymers by living ring-opening olefin metathesis polymerization
Wilhelm Risse,Robert H. Grubbs +1 more
TL;DR: A review of titanacyclobutane-initiated "living" olefin metathesis polymerization for the preparation of new polymer structures is given in this paper, where the same type of reaction was used to link preformed polymer blocks to give ABA-type triblock copolymers and graft Copolymers.
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Reaction de metathese des olefines induite photochimiquement en presence d'un complexe de metal de transition : VI. Existence probable d'un metallodichlorocarbene primaire
TL;DR: In this paper, a mechanism for the formation of these compounds is outlined, and the mechanism for their formation is described in terms of the insertion of metalladichlorocarbene moieties into the carbon double bond.
Journal ArticleDOI
The photoinduced metathesis of olefin catalyzed by W(CO)5L-AXn system
TL;DR: In this article, the metathesis of internal and terminal olefins was investigated in photocatalytic systems containing tungsten compounds of the type W(CO)5L (L = CO, py, PPh3, Cl−).
Journal ArticleDOI
From the reaction of metal—carbene complexes with cyclic enol ethers to the synthesis and structure of μ-alkylidene complexes of tungsten and their possible implication in the olefin metathesis reaction
TL;DR: The reaction of a metathesis catalyst prepared from W(CO) 6 /CCl 4 /hν with cyclic enol ethers gives products arising from the probable insertion of a dichlorocarbene complex of tungsten into the carbon-carbon double bond.