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  • 1
    Electronic Resource
    Electronic Resource
    A Novel Polyaddition of Bifunctional Acetylenes Containing Electron-Withdrawing Groups. 2. Synthesis of Polymers Having .beta.-Alkylmercaptoenoate Moieties by the Reaction with Dithiols (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 6020-6025 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00122a006
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  • 2
    Electronic Resource
    Electronic Resource
    A Novel Polyaddition of Diols with Bifunctional Acetylenes Having Electron-Withdrawing Groups (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 433-436 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00106a005
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  • 3
    Electronic Resource
    Electronic Resource
    Convenient Synthesis of Pyridine-Containing Polymers by the Cobalt(III)-Catalyzed Polymerization of Diynes with Nitriles (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 5688-5690 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00120a043
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  • 4
    Electronic Resource
    Electronic Resource
    Rearrangement of the Main Chain of an Organocobalt Polymer: Synthesis of Novel 2-Pyridone-Containing Polymers by the Reaction with Isocyanates (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 3042-3047 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00113a005
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  • 5
    Electronic Resource
    Electronic Resource
    Block copolymerization of alkoxyallenes with phenylallene by the living coordination system with π-allylnickel catalyst (1997)
    Springer
    Polymer bulletin 39 (1997), S. 685-692 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. The block copolymerization of alkoxyallenes (2 a: n-octyloxyallene and 2 b; n-butoxyallene) with phenylallene (3) was carried out by [(π-allyl)NiOCOCF3]2 (1) in toluene by the sequential addition of the two monomers. In spite of rather different polymerizability between 2 and 3 (i.e., 2 has ca. 70 times larger kinetic coefficient than 3), block copolymers having narrow molecular weight distributions were obtained successfully by controlling the reactivity of the propagating end with the additives such as triphenylphosphine (PPh3) and copper(I) iodide. In the case of the copolymerization of 3 with 2, the addition of PPh3 was effective for the control of the polymerization step of 2. The block copolymers with controlled segment length and narrow molecular weight distributions (M w/M n〈1.08) were obtained almost quantitatively. Conversely, when the copolymerization was started from 2, the control of the first stage required PPh3 as a ligand of the initiator which interrupt the second polymerization of 3. However, block copolymers with narrow molecular weight distributions (M w/M n〈1.03) were obtained simply by adding copper(I) iodide in the polymerization stage of 3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050203
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  • 6
    Electronic Resource
    Electronic Resource
    Palladium-catalyzed three-component coupling Polymerization of diyne, aryl dihalide, and hydride (1997)
    Springer
    Polymer bulletin 39 (1997), S. 677-684 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. The palladium-catalyzed three-component coupling reaction of acetylenes, aryl halides, and hydride and its application to polymer synthesis are described. The coupling reaction of 1,2-diphenylacetylene, iodobenzene, and sodium diethyl benzylmalonate was carried out at 80 °C for 48 h in 1,4-dioxane with Pd(OAc)2/tri-o-tolylphosphine, from which triphenylethylene was obtained in 71% isolated yield. The benzylic hydrogen of sodium diethyl benzylmalonate was supposed to be a hydride source in the present reaction by detecting diethyl benzalmalonate in the reaction system. Based on the results, the coupling polymerization of 1,2-bis(4-phenylethynylphenyl)ethane, 4,4′-diiodobiphenyl, and sodium diethyl benzylmalonate was carried out at 80 °C for 48 h to produce a polymer (M n=8500, M w/M n=3.0) in high yield. Using various aryl dihalides, the corresponding polymers having trisubstituted ethylene units were also obtained in high yields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050202
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis of novel organocobalt poly(arylene-vinylene)s containing (cyclobutadiene)cobalt moieties in the main chain (1999)
    Springer
    Polymer bulletin 43 (1999), S. 165-170 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Organocobalt poly(arylene-vinylene)s composed of 1,2- or 1,3- linkage at their cyclobutadiene moieties (3 and 4, respectively) were prepared by the Heck reaction of p-divinylbenzene with (cyclobutadiene)cobalt-containing monomers having two aryl bromide moieties (1 and 2, respectively). The number average molecular weights (M n) of the obtained organocobalt poly(arylene-vinylene)s (3 and 4) were 4,100 and 4,000, respectively (GPC, on the basis of polystyrene). UV-vis spectra of 3 and 4 exhibited main π-π* absorption peaks at 362 and 397 nm, respectively, which were ca. 60 nm bathochromically shifted from those of the corresponding monomeric units. Both polymers were found to show thermotropic liquid crystallinity in the range of room temperature to ca. 80 °C by employing differential scanning calorimetry (DSC) and the optical measurement using crossed polarizers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050548
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  • 8
    Electronic Resource
    Electronic Resource
    Cationic polymerization of glycidyl phenyl ether initiated by various arylsulfonium salts as new thermal latent cationic initiators (1998)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 19 (1998), S. 493-497 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The cationic initiation activity of derivatives of S-methylsulfonium salts has been evaluated in the cationic polymerization of glycidyl phenyl ether (1). These initiators are soluble in 1 and capable of initiating the cationic polymerization of 1 on heating, except for methyltetrahydrothiophenium tetrafluoroborate (6) (r.t. -160°C). Among them, methyldiphenylsulfonium tetrafluoroborate (4) shows moderate thermal latency, that is the polymerization of 1 occurs efficiently at 160°C but not below 80°C.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Rearrangements versus ligand exchange reactions of organocobalt polymer having cobaltacyclopentadiene moieties in the main chain Part of the work presented here was communicated in Ref. 1: Macromolecules, 27, 7009 (1994). (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 12 (1998), S. 735-742 
    Details
    ISSN: 0268-2605
    Keywords: polymer ; organocobalt ; Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The rearrangement reaction of an organocobalt polymer with cobaltacyclopentadiene moieties in the main chain (1) was carried out to yield a­new polymer bearing (η5-cyclopentadienyl) (η4-­cyclobutadiene)cobalt moieties in the main chain (2). For instance, a polymer (2) containing pure η4-cyclobutadienecobalt units was obtained as a yellow powder in 79% yield by the reaction of 1 in tetrahydrofuran (THF) at 110 °C for 1 h in a sealed tube. The polymer (2) obtained was soluble in organic solvents such as chloroform, THF and N,N-dimethylformamide and was quite stable under air. It showed good thermal stability and a weight loss of 5% was observed at 482 °C by thermogravimetric analysis (TGA). On the other hand, displacement of the triphenylphosphine ligands on the main chain of the organocobalt polymer (1), without rearrangement of the cobaltacyclopentadiene rings, was observed when the reaction was carried out in the presence of appropriate ligands such as P(n-Bu)3. The resulting ligand-exchanged polymer showed different properties in comparison with 1. For instance a polymer bearing tri-n-octylphosphine is soluble in n-hexane, which is a poor solvent for 1. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis and radical polymerization of styrene derivative bearing kojic acid moieties (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 271-276 
    Details
    ISSN: 0887-624X
    Keywords: radical polymerization ; styrene derivatives ; kojic acid ; functional polymers ; complexation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A styrene derivative (1) bearing kojic acid moieties was prepared by the base-catalyzed reaction of p-formylstyrene with kojic acid. Hydroxyl groups in 1 were subjected to acetylation. Although 1 did not undergo radical polymerization, the acetylated styrene derivative (2) showed good radical homo- and copolymerizability. For instance, a polymer having the number average molecular weight (Mn) of 60,000 was obtained in almost quantitative yield (97%) by the polymerization of 2 in chloroform (1.5 M) at 60°C for 36 h using α,α′-azobis(isobutyronitrile) (AIBN, 5 mol %) as an initiator. Under similar conditions, copolymers of 2 with styrene were also obtained in high yield. By partial deacetylation of the copolymer with a triethylamine catalyst, a copolymer containing α-hydroxyketone structures originated from kojic acid moieties was successfully regenerated. The deacetylated copolymer can be crosslinked by complexation with metal salts such as Al3+. © 1996 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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