Showing papers on "Norbornene published in 1989"

Alkene epoxidations catalyzed by iron(III), manganese(III), and chromium(III) porphyrins. Effects of metal and porphyrin substituents on selectivity and regiochemistry of epoxidation

Abstract: The products of epoxidation of norbornene, cyclohexene, and adamantylideneadamantane with pentafluoroiodobenzene using as catalysts variously substituted tetraphenylporphyrin complexes of chloroiron (III), chloromanganese(III), and chlorochromium(III) have been determined. All catalysts afforded the epoxide from adamantylideneadamantane, suggesting that the metallacycle intermediate, impossible in this case, is not required for epoxidation. The electronegatively substituted iron porphyrins show a great tendency toward epoxidation rather than allylic oxidation and show more selectivity for cis-alkenes.

Alkene epoxidation by ruthenium(II) phosphine complexes. A kinetic investigation

Abstract: The coordinatively unsaturated complexes (I) effectively promote the epoxidation of olefins such as octene, cyclooctene, norbornene and stilbene in the presence of iodosylbenzene and in low-coordinating media.

Ring opening metathesis polymerization of strained cyclic ethers

Abstract: A process is provided for the polymerization of 7-oxanorbornene and its derivatives. The process involves the ring opening metathesis of 7-oxanorbornene and its derivatives, preferably using water as the solvent. Such materials may be homopolymerized or, alternatively, copolymerized with other cyclic olefins such as norbornene. The resulting polymers are also novel.

Thermoplastic resin molded article

Abstract: PURPOSE: To obtain the titled molded article remarkably excellent in adhesion of coating film while retaining transparency of these components useful for car, etc., by applying a specific composition onto the surface of molded article consisting essentially of a monomer composed of a norbornene derivative having a specific structure. CONSTITUTION: The aimed composition obtained by applying (B) a mixed composition consisting of (i) 100 pts. wt. organoalkoxysilane expressed by the formula Rsi(OR') 3 (R is 1-8C organic group; R' is 1-5C alkyl, etc.) or hydrolyzate thereof or partially condensed product thereof, (ii) colloidal silica dispersed into hydrophilic solvent, of 0-50 pts. wt. expressed in terms of solid content, (iii) 0.1-50 pts. wt. water and (iv) 100-1,000 pts.wt. solvent to the surface of (A) resin molded article consisting essentially of a hydrogenated polymer obtained by further hydrogenating a ring-opened polymer obtained by subjecting a monomer consisting of at least one norbornene derivative expressed by the formula (A and B are H or 1-10C hydrocarbon; X and Y are H, 1-10C hydrocarbon, halogen, etc.) or the monomer and copolymerizable monomer copolymerizable with the monomer to ring opening polymerization. COPYRIGHT: (C)1991,JPO&Japio

Di- and tetrafunctional initiators for the living ring-opening olefin metathesis polymerization of strained cyclic olefins

Abstract: La reaction photochimique d'un derive de titanacyclobutane avec des composes comportant 2 ou 4 cycles norbornene donne des bis- et tetrakis-(titanacyclobutane). Ces composes sont utilises comme amorceurs di- et tetrafonctionnels pour la polymerisation-methathese vivante avec ouverture de cycle du norbornene. Les polymeres vivants obtenus sont termines par des reactions de Wittig avec des cetones

Functionalization of olefins by alkoximidoylnitrenes

Abstract: (N-Cyano- and N-(methylsulfonyl)alkoxycarbimidoyl)nitrenes, generated in situ from the corresponding azides by 300-nm UV light, convert a variety of olefins cleanly and stereospecifically to the corresponding aziridines. These can readily be hydrolyzed to N-unsubstituted aziridines or ring-opened to allylic isoureas. The nitrenes can also be generated by thermolysis at 80{degree}C. The azides add to norbornene to give triazolines, which lose nitrogen to give the exo-aziridines.

Reinforced polymeric matrix

Abstract: A reinforced polymeric matrix comprising a glass mat and a norbornene polymer surrounding the glass mat, the glass mat is composed of at least one glass fiber treated with a silane coupling agent and a binder adhering the glass fiber(s) to the norbornene polymer; the binder is selected from polyolefins, vinyl aromatic polymers, and ring-opened polymers of at least one norbornene-type monomer containing at least one norbornene group. Process for making a reinforced polymeric matrix comprises positioning a glass mat within a mold, the glass mat having been treated with a hydrocarbon polymer binder; mixing a plurality of streams, one stream containing a catalyst of a metathesis catalyst system, another stream containing a cocatalyst of a metathesis system, and at least one of the streams containing at least one norbornene-type monomer which is liquid at room temperature to form a mixed stream; introducing the mixed stream into the mold around the mat; polymerizing by ring opening the monomer(s) in the mold; and extracting from the mold the reinforced polymeric matrix, wherein the norbornene polymer is thermoset.

Thioanhydrides. 3. Synthesis, properties and Diels-Alder reactions of sulfur analogs of 1,8-naphthalic anhydride

Abstract: Des naphto [1,8-cd] pyrannedithione-1,3 et thioxo-3 naphto [1,8-cd] pyrannone-1, naphto [1,8-cd] thiopyrannediones-1,3 et -dithiones-1,3 sont synthetisees; les additions de Diels-Alder de ces anhydrides avec le norbornene et l'acenaphtylene sont etudiees

Unusual ring-opening polymerization of spiro orthocarbonate containing norbornene moiety

Abstract: Etude du mecanisme de polymerisation cationique du spiro orthocarbonate de norbornene, different du mecanisme observe pour d'autres spiro-orthocarbonates a 6 chainons. Proposition de mecanisme via la decomposition rapide du monomere suivie de la copolymerisation du spiro carbonate cyclique forme avec un spiro oxetanne

Reaction injection molding method

Abstract: This invention pertains to the use of an organic fluorine compound as a mold release agent wherein at least one norbornene compound is polymerized by ring opening in a mold coated with said release agent. The organic fluorine compound release agent can be used in combination with a conventional mold release agent.

Epoxidation of alkenes catalyzed by iron(III) Schiff base chelates. A monooxygenase model.

Abstract: Iron(III) Schiff base chelates [Fe2(PA2ppd)2Cl4]Cl2 (1), [Fe2(PA2mpd)2Cl4]Cl2 (2), and [Fe(PA2opd)Cl2]Cl (3), were synthesized, where (PA2ppd), (PA2mpd), and (PA2opd) are the Schiff bases derived from 2-pyridinecarbaldehyde (PA), and p-phenylenediamine (ppd), m-phenylenediamine (mpd), and o-phenylenediamine (opd) respectively. The complexes 1, 2, and 3 catalyzed the epoxidation of alkenes with iodosylbenzene as an oxidant providing a chemical model for cytochrome P-450. The binuclear complexes (1, 2) were superior to the mononuclear complex (3) as the catalyst for epoxidation of norbornene. Addition of pyridine bases increased the rates, and yields of epoxidation.

Ring-opening polymerization of norbornene and six of its methyl derivatives by well-defined tungsten-carbene complex catalysts

Abstract: Eight tungsten-carbene complex catalysts of the type W(CHCMe3)L1L2L3L4, where the ligands L are various combinations of OCH2CMe3, SO3CF3, OSiPh3, Br and I, have been used, in the presence and absence of GaBr3, to polymerize norbornene and six of its methyl derivatives by ring opening. The microstructure of the polymers was determined from their 13C NMR spectra; values of cis content, cis-trans blockiness, ring-dyad tacticity and head-tail bias were derived as appropriate to each system. The results are discussed in terms of electronic and steric effects in the propagating carbene complexes.

Adhesion promoters for thiolene adhesive formulations

Abstract: Compounds useful as adhesion promoters for thermally cured thiolene adhesives include a) acrylic or norbornene acid phosphate esters such as ##STR1## b) maleic, acrylic, methacrylic, norbornene dicarboxylic, and fumaric acids and half acid esters and peresters of maleic fumaric and norbornene dicarboxylic acids; and c) norbornene, acrylic or methacrylic silanes having two or three hydrolyzable groups bound to the silicon atom thereof, such as 5-(triacetoxysilyl) norbornene The adhesion promoters may be employed as surface primers for conventional thiolene compositions Alternatively the thiolene compositions themselves may be modified by addition of 01 to 10% by weight of the adhesion promoter Preferred thiolene compositions employ norbornene functional ene ingredients

Oligomerization and Copolymerization of endo-N-Cyclohexyl-9-oxabicyclo[2,2,1]hept-2-ene-5,6-dicarboximide

Abstract: endo-N-Cyclohexylbicyclo[2,2,1]hept-2-ene-5,6-dicarboximide (CHN or endo-CHN), one of the norbornene derivatives, was prepared from N-cyclohexylmaleimide (CHMI) and cyclopentadiene (CPD) according to the Diels-Alder reaction. Yields of homopolymers were about 10 wt% No CHN could be polymerized in bulk without radical catalysts under 250°C. But at 250°C for 6 h, endo-CHN was converted to exo-CHN in a 75 mol% yield. The polymerization of CHN over 300°C for 1 h gave the polymer in about 100% yield. The molecular weights (Mw) of polymer insoluble in methanol were 1500 to 2000 and the Mw of the polymer soluble in methanol was about 700. It was found that the polymer consisted of a mixture among CHN, CHMI and an adduct(II) obtained from CHN and CPD.

Hydrogenated product of ring-opening copolymer and preparation thereof

Abstract: PURPOSE:To prepare the title hydrogenated product having excellent heat resistance and mechanical characteristics and good balance among transparency, water resistance etc., and being usable in a wide range of application fields, by hydrogenating a part or the whole of olefinically unsatd. groups of a specified ring-opening polycyclic norbornene copolymer. CONSTITUTION:A ring-opening polycyclic norbornene copolymer having repeating units of formulas IV and V wherein at least 50% of bonds of formula III constituting the main chain are single bonds is prepd. by hydrogenating a part or the whole of olefinically unsatd. groups of a ring-opening polycyclic norbornene copolymer contg. 90-30mol.% repeating units of formula I or alkyl deriv. thereof and 10-70mol.% repeating units of formula II or alkyl deriv. thereof and having an intrinsic viscosity [eta] of 0.01-20dl/g as measured at 25 deg.C in toluene with hydrogen by using a hydrogenation catalyst. This hydrogenated product has excellent heat resistance, mechanical strengths, transparency and, resistance to water absorption and is usable in a wide range of application fields such as an optical field.

Production of norbornene-based polymer

Abstract: PURPOSE: To delay pot life of a reaction solution and shorten curing time in a metallic mold by using respective specific metathetic catalyst system and pot life regulator in carrying out bulk ring opening polymerization of a norbornene-based monomer mixture. CONSTITUTION: A norbornene-based monomer mixture of tri- or polymers containing tricyclopentadiene is subjected to bulk ring opening polymerization in the presence of a molybdenum-based metathetic catalyst (e.g. tridodecylammonium molybdate) and a cocatalyst (e.g. an alkylaluminum halide) using 5-alkenyl-2-norbornenes (preferably 5-vinylbicyclo[2.2.1]hept-2-ene, etc.) as a pot life regulator of the reaction solution. Furthermore, the reaction is normally carried out in a metallic mold and the metallic mold temperature is preferably 50-120°C at that time. The mold clamping pressure may be normally 0.1-100kg/cm 2 . COPYRIGHT: (C)1991,JPO&Japio

Detection of diastereoisomers of metallacyclobutane intermediates in the metathesis polymerization of norbornene and its derivatives

Abstract: Addition of norbornene derivatives to racemic mixtures of chiral tungsten–carbene complexes is shown to lead to the formation of transoid diastereoisomeric tungstacyclobutanes that can be distinguished by 1H n.m.r. spectroscopy; cisoid structures, though formed, are too unstable to be observed.

Rearrangement and cleavage of the Grignard reagent from 5-(chloromethyl)norbornene

Abstract: Le chlorure de norbornenyl-5methyl magnesium subit des transpositions chimiques avec ouverture de cycle pour donner un bicyclo [3.3.0] octene-2, un allyl-3 cyclopentene-1, un allyl-1 ou 2 cyclopentadiene-1,3. Les mecanismes de reaction sont discutes

Catalyst and process for polymerization of norbornene derivatives

Abstract: Disclosed is a process for the polymerization of norbornene derivatives which comprises contacting the monomer(s) with a catalytic system comprising the following two components: (1) a tungsten compound which is the product of combining a tungsten halide with a para-trihalomethylphenol which can be described by the formula ##STR1## in which each R is selected from alkyl and halide, and (2) a compound of the general formula: ##STR2## in which at least two of R1, R2 and R3 are selected from unsubstituted and substituted C1-20 hydrocarbyl.