Showing papers on "Ring-opening metathesis polymerisation published in 1988"
220 citations
177 citations
121 citations
TL;DR: In this article, a complex of the type W(CHtBu)(NAr)Cl2(dme) (Ar = 2,6-diisopropylphenyl) with PCl5 in dimethoxyethane is presented.
72 citations
TL;DR: The photocatalytic metathesis reactions of olefins in systems containing Group VI metal carbonyls are reviewed in this article, where the authors focus on the transition compounds formed in these systems and the reaction mechanism.
39 citations
TL;DR: In this article, the synthesis of olefin metathesis of vinyl (methyl, alkoxy)-substituted silanes, in the presence of highly active catalytic systems based on complexes of ruthenium and rhodium, as well as those with various hydride-donor cocatalysts and dioxygen activators, are summarized.
37 citations
35 citations
TL;DR: The properties of noble metal halide catalysts for ring-opening metathesis polymerization of norbornene, endo-dicyclopentadiene and norbomadiene have been investigated as a function of prior or in situ treatment by the latter pair of diolefins, which may also be monomers as mentioned in this paper.
24 citations
TL;DR: In this paper, the Schrock carbyne complex Cl3(dme)W≡CCMe3 (dme = dimethoxyethane) was used for alkyne polymerization.
20 citations
TL;DR: Exo-N-pentafluorophenylbicyclo[2.2.1]hept-5-ene-2,3-dicarboximide(I) readily undergoes metathesis ring-opening polymerization when exposed to conventional metathetic catalysts such as WCl 6 /ME 4 Sn and MoCl 5 /Me 4 Sn; by contrast, its endo isomer (II) is not homopolymerized but can be copolymerized with (I) as mentioned in this paper.
16 citations
Patent•
15 Jan 1988TL;DR: In this paper, a process for olefin metathesis by oligomerizing lower olefins over medium pore zeolite catalyst to higher olefs and adding an alpha-olefin in the presence of a meta-catalyst having a low acidity is described.
Abstract: A process for olefin metathesis by oligomerizing lower olefins over medium pore zeolite catalyst to higher olefins then adding an alpha-olefin in the presence of a metathesis catalyst having a low acidity to provide a mixture of alpha-olefins. Metathesis olefins may be polymerized to make a lube product.
Patent•
24 Oct 1988TL;DR: In this paper, a precursor to the synthesis of polyacetylene and other conductive polymers is provided by the formation of high energy polymers by ring opening metathesis polymerization.
Abstract: A precursor route to the synthesis of polyacetylene and other conductive polymers is provided by the formation of high energy polymers by ring opening metathesis polymerization. In particular, the high energy polymers having the following general formula are formed from monomers as shown: ##STR1## In the formula, A is an organic structure that is relieved of strain upon the ring opening polymerization and B is an organic structure with strain energy≧20 kcal/mole. Such high energy polymers are also found to be spontaneously decomposable with heat or mechanical stress. Consequently, the high energy polymers formed in accordance with the invention may find use in explosives or other sources of high energy.
Journal Article•
TL;DR: In this paper, it was shown that chain-carrying CH2 species are generated to only a small extent by the adsorption of isobutene on MoO3-x/TiO2.
Abstract: The metathesis reaction of terminal alkenes other than isobutene took place on MoO3–x/TiO2, whereas that of isobutene proceeded in the presence of ethylene and following treatment of the catalyst with SnMe4 at room temperature. These results infer that chain-carrying CH2 species are generated to only a small extent by the adsorption of isobutene on MoO3–x/TiO2, although they are formed by the adsorption of alk-1-enes and SnMe4. The metathesis-inactive material, fully oxidized MoO3/TiO2, was changed to a metathesis-active catalyst by treating it with SnMe4. This suggests that MoO3/TiO2 has no ability to yield CH2 species with terminal alkenes but that these species can be supplied with SnMe4. An analysis by X-ray photolectron spectroscopy infers that SnMe4 adsorbed on MoO3/TiO2 releases methyl groups concomitant with the oxidation of Sn.
TL;DR: In this article, the reactions of reduced Phillips catalyst, a polymerisation catalyst for 1-alkenes, with differently substituted Fischer-type tungsten carbene complexes (CO)5W = CR1R2 (R1 = Ph, Tol, CH3; R2 = PH, OCH3), which are metathesis catalysts with poor activity, yield bimetallic heterogeneous compounds by the loss of one CO ligand.
Patent•
16 May 1988TL;DR: In this article, a method of reducing the activation rate of an alkyl aluminum activator in the metathesis polymerization of polycyclic cycloolefins is discussed.
Abstract: Disclosed is a method of reducing the activation rate of an alkyl aluminum activator in the metathesis polymerization of polycyclic cycloolefins. Activation rate is reduced by use of a bidentate Lewis base as the reaction rate moderator.
Patent•
01 Mar 1988TL;DR: In this article, a novel metathesis catalyst polymerizable composition is provided which comprises at least one ring-opening MCP polymerizable norbornene-type monomer and at least a ring-opened MCP amine antioxidant comonomer.
Abstract: A novel metathesis catalyst polymerizable composition is provided which comprises at least one ring-opening metathesis catalyst polymerizable norbornene-type monomer and at least one ring-opening metathesis catalyst polymerizable amine antioxidant comonomer.
TL;DR: In this paper, intermediate species of the metathesis reactions of propene, 1-butene and isobutene were elucidated using a 1:1:1-1 mixture of alkene and fully deuterated alkene, ethylene and ethylene-13C2 on a SnMe4-treated MoO3-x/TiO2 catalyst.
TL;DR: A review of functionalised olefin metathesis in synthetic chemistry, analytical chemistry and biochemistry can be found in this paper, where the main problems in synthetic applications are the low reaction rate and the poor stereoselectivity of most metathetic conversions.
TL;DR: In this article, the metathesis reaction of octene-1 has been studied using RN(CH3)3ClW(CO)5/C2H5AlCl2 with RCH3 or a strong basic anion exchange resin as catalyst.
01 Jan 1988
TL;DR: In this paper, the authors classified metathesis reactions into three types: (i) olefin metathetic reactions, (ii) polymerization, and (iii) degradation, and suggested that this reaction may be useful not only in degradation of rubbers but also in some chemical modifications, for example, synthesis of reactive oligomers, syntheses of graft and block copolymers.
Abstract: Metathesis catalysts are very unique catalyst systems composed of WCl6 or MoCl5 (in most cases) and organometalic compounds (in many cases, Sn(CH3)4 or Al(C2H5)2Cl). They are reactive towards olefinic compounds, and rearrangements of the double bonds occur. The metathesis reactions are classified into (i) olefin metathesis, (ii) metathesis polymerization, and (iii) metathesis degradation. Olefin metathesis and metathesis polymerization are briefly reviewed. From a view point of polymer reactions, several articles treating metathesis degradation were extensively reviewed. In these studies, rubbers, i.e., natural rubber, cis-1, 4-polyisoprene, polybutadienes, styrene-butadiene rubber, polyalkenamers were the substrates of the reaction. It is suggested that this reaction may be useful not only in degradation of rubbers, but also in some chemical modifications, for example, synthesis of reactive oligomers, syntheses of graft and block copolymers.
01 Jan 1988
TL;DR: In this article, the identity of the pertinent kinetic species in olefin metathesis by WCl6/SnMe4 was determined, using competitive kinetic polymerizations, to be the metal carbenecomplexed Olefin.
Abstract: I. KINETICS AND THERMODYNAMICS OF OLEFIN METATHESIS POLYMERIZATION II. ANIONIC ADDITIONS OF POLYSTYRENE TO SURFACES OF POLY(CHLOROTRIFLUOROETHYLENE) September 1988 Penelope A. Patton, B.S., North Carolina State University M.S., North Carolina State University Ph.D., University of Massachusetts Directed by: Professors T. J. McCarthy and C. P. Lillya The identity of the pertinent kinetic species in olefin metathesis by WCl6/SnMe4 was determined, using competitive kinetic polymerizations, to be the metal carbenecomplexed olefin. The ease with which the olefin can complex the metal determines its reactivity. Using this knowledge, and thoughtful examination of reaction thermodynamics, metathesis products were obtained from cyclohexene, both as homooligomers, and copolymers with norbornene. Polystyrene was anionically grafted to surfaces of poly(chlorotrifluoroethylene) films. The effects of temperature, reaction time, anion concentration, solvent, and the nature of the anion on reaction kinetics, and the nature of the product were determined. It was found that grafting, in the presence of solvent, facilitated considerable reorganization and dissolution of film surfaces, the extent of either of which varied with solvent. Films were characterized using UV/Vis, ESCA, gravimetric analysis, and contact angle measurements.