Journal ArticleDOI
Tuning the activity of alternative Ru-based initiators for ring-opening metathesis polymerization of norbornene and norbornadiene by the substituent in 4-CH2R-piperidine
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TLDR
In this article, RuCl 2 (PPh 3 ) 2 (4-CH 2 R-pip) complexes were synthesized and applied as initiators for ROMP of NBE and norbornadiene (NBD) under different reaction times, temperatures and monomer concentrations.Abstract:
The novel [RuCl 2 (PPh 3 ) 2 (4-CH 2 R-pip)] complexes, with R = H (complex 1 ), Ph ( 2 ) or OH ( 3 ), were synthesized and applied as initiators for ROMP of norbornene (NBE) and norbornadiene (NBD) under different reaction times, temperatures and monomer concentrations. There is a clear difference in the homopolymer yields in the order 1 > 2 > 3 at [monomer]/[Ru] molar ratio of 5000, at 25 °C for 5–60 min. Difference in the yields tends to disappear at 50 °C, with quantitative yields for 15–30 min with any type of initiator. Results from copolymers obtained at RT for 60 min from fixed amounts of NBE with four different amounts of NBD suggest that the type of initiator also affects the reactions, with more insertion of NBD with 1 . The occurrence of cross-linking enhanced as the NBD loading increased, evidenced by decrease in the M c and increase in the T g values, besides the influence of the type of initiator.read more
Citations
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Journal ArticleDOI
The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2014
TL;DR: A review of papers published in the year 2014 that focus on the synthesis, reactivity, or properties of compounds containing a carbon-transition metal double or triple bond can be found in this paper.
Journal ArticleDOI
Copolymerization of Norbornene and Norbornadiene Using a cis-Selective Bimetallic W-Based Catalytic System.
Grigorios Raptopoulos,Katerina Kyriakou,Gregor Mali,Alice Scarpellini,George C. Anyfantis,Thomas Mavromoustakos,Marinos Pitsikalis,Patrina Paraskevopoulou +7 more
TL;DR: The bimetallic cluster {W2} is not only a cost-efficient, practical, highly active, and cis-stereoselective ROMP-initiator, but it can also be used for the synthesis of more complex macromolecular structures.
Journal ArticleDOI
Non-carbene Complex [RuCl2(PPh3)2(azocane)] as Active Catalyst Precursor for ROMP and ATRP
Rodolpho A. N. Silva,Patrícia Aparecida Borim,Patrícia Aparecida Borim,Larissa R. Fonseca,Benedito S. Lima-Neto,José L. Silva Sá,Valdemiro P. Carvalho-Jr +6 more
TL;DR: In this article, a trigonal bipyramid geometry was synthesized, characterized (CHN elementary analysis, FTIR, EPR, and 31P NMR), and applied as catalyst precursor for ring opening metathesis polymerization and atom transfer radical polymerization (ATRP).
Journal ArticleDOI
New dmso–ruthenium catalysts bearing N-heterocyclic carbene ligands for the ring-opening metathesis of norbornene
Thais R. Cruz,Rodolpho A. N. Silva,Antonio E.H. Machado,Benedito S. Lima-Neto,Beatriz E. Goi,Valdemiro P. Carvalho +5 more
TL;DR: In this article, the authors used the polynorbornene (polyNBE) syntheses via ROMP using the complexes 1−4 as pre-catalysts in the presence of ethyl diazoacetate (EDA) were evaluated under different [EDA]/[Ru] and [NBE]/Ru] ratios, temperatures (25 and 50 °C) and times (5-60 min).
Journal ArticleDOI
On the stability of the RuCl2(triphenylphosphine)2(amine) complexes: Ligand substituent effects of cyclic and acyclic amines
TL;DR: In this paper, the authors applied the density functional theory to understand the substituent effects of cyclic and acyclic amines on the stability of RuCl2(PPh3)2(amine) complexes.
References
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Journal ArticleDOI
Ruthenium-based heterocyclic carbene-coordinated olefin metathesis catalysts.
TL;DR: The fascinating story of olefin (or alkene) metathesis 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.
BookDOI
Handbook of metathesis
TL;DR: The Role of the "Tebbe Complex" in Olefin Metathesis is discussed in this paper, where the discovery of well-defined Ruthenium Olefin metathesis Catalysts is discussed.
Book
Dynamic Mechanical Analysis: A Practical Introduction
TL;DR: An Introduction to Dynamic Mechanical Analysis as discussed by the authors is a good starting point for a discussion of the application of dynamic testing in real world problems, as well as guidelines for DMA applications to real problems.
Journal ArticleDOI
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.