Polymerization of Substituted Acetylenes

Masuda, Toshio; Sanda, Fumio

doi:10.1002/9783527619481.ch40

Cited by 60 publications

(26 citation statements)

References 233 publications

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“…The corresponding Mo(CO) 6 -CCl 4 -hm catalyst was less active for 1, and the M n of polymer remained $1 Â 10 4 . Other metal carbonyls such as Cr(CO) 6 , Mn 2 (CO) 10 , and Re 2 (CO) 10 were found to be ineffective. During this investigation we noticed that the M(CO) 6 -CCl 4 -hv (M ¼ W, Mo) system is also efficient in olefin metathesis.…”

Section: W and Mo Catalystsmentioning

confidence: 99%

“…Aromatic polyacetylenes [for example, poly(7), poly (10), and poly (13)] showed large Young's moduli (500-2000 MPa) and small elongations at break (1-8%), implying that these polymers are hard and brittle. 102 In contrast, Young's moduli of Si-containing aliphatic polyacetylenes [for example, poly(9)] were rather small (several hundred MPa), and their elongations at break were relatively large (several tens percent); that is, they are soft and ductile.…”

Section: Mechanical Properties and Glass Transition Temperaturementioning

confidence: 99%

“…Steady-state photoconductivity was examined in thin membranes of poly[(o-trimethylsilyl)phenylacetylene] [poly (10)] sandwiched between SnO 2 and metal electrodes (Chart 6). 109 Both the dark current density (J d ) and photocurrent density (J ph ) depended superlinearly on the applied electric field.…”

Section: Photoelectronic Propertiesmentioning

confidence: 99%

“…After this finding, many classic metathesis catalysts were developed, which turned out to be highly effective to various substituted acetylenes including sterically very crowded monomers. [8][9][10][11] More recently, it was found that MoOCl 4 -based ternary catalysts and so-called Schrock's metal carbenes induce living polymerization of substituted acetylenes. In parallel to these catalyst developments, Rh catalysts were found to polymerize monosubstituted acetylenes to give stereoregular cis-transoidal polymers.…”

Section: Introductionmentioning

confidence: 99%

“…12,13 A comprehensive and informative review article has recently been published concerning the living polymerization of substituted acetylenes. 14,15 The above-stated progress of various transition metal-based polymerization catalysts enabled the synthesis of a wide variety of polymers from acetylene derivatives including monosubstituted and disubstituted acetylenes, [8][9][10][11][16][17][18] and a,x-diynes. 19,20 Unlike polyacetylene, substituted polyacetylenes having bulky substituents are usually soluble in many common solvents and stable enough in air for a long period of time.…”

Section: Introductionmentioning

confidence: 99%

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Substituted polyacetylenes

Masuda

2006

J. Polym. Sci. A Polym. Chem.

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392

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This article reviews the chemistry of substituted polyacetylenes developed by our research group, more specifically, development of polymerization catalyst, synthesis of new polymers, elucidation of their structure, investigation of their properties, and development of their functions. The main features are as follows: a number of catalysts based on group 5, 6, and 9 transition metals (Nb, Ta, Mo, W, and Rh) have been developed, which include living polymerization catalysts. By using these catalysts, many new substituted polyacetylenes have been synthesized, whose molecular weights are very high (Mw = 104−106). Most of the polymers are soluble in many common solvents and stable enough in the air unlike polyacetylene. Some of these polymers exhibit interesting functions including high gas permeability and photoelectronic properties. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 165–180, 2007

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Section: W and Mo Catalystsmentioning

confidence: 99%

Section: Mechanical Properties and Glass Transition Temperaturementioning

confidence: 99%

Section: Photoelectronic Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Substituted polyacetylenes

Masuda

2006

J. Polym. Sci. A Polym. Chem.

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392

222

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Metathesis

Delaude

Noels

2005

Kirk-Othmer Encyclopedia of Chemical Technology

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In organic synthesis and polymer science, the metathesis reaction consists of a unique metal‐catalyzed carbon skeleton redistribution in which a mutual exchange of unsaturated carbon–carbon bonds takes place. The reaction is generally reversible and limited to an equilibrium. In its most common embodiment, alkenes serve as reagents. Hence, olefin metathesis constitutes a powerful catalytic method for both cleaving and forming CC double bonds. Alkyne metathesis and ene–yne metathesis are also important synthetic pathways. All three types of metathesis occur intra‐ or intermolecularly and numerous combinations thereof are possible (ring‐closing metathesis, ring‐opening metathesis polymerization, cross‐metathesis, etc). Metathesis has opened up new routes to important petrochemicals, oleochemicals, polymers, and specialty chemicals. The transformation often gives access with remarkable atom economy to structures that are not available by any other means, or only via multistep painstaking procedures. Major industrial processes rely on metathesis for the production of olefins. They are usually based on inexpensive, ill‐defined, multicomponent catalytic systems derived from tungsten, molybdenum, rhenium, or ruthenium salts. Research laboratory applications take advantage of well‐defined metal‐alkylidene complexes of molybdenum and ruthenium that combine high activities and ease of set‐up under reproducible conditions, albeit at the price of a higher cost.

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Substituted Polyacetylenes

Sakaguchi

Masuda

2017

Membrane Materials for Gas and Vapor Separation

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Polymerization of Substituted Acetylenes

Cited by 60 publications

References 233 publications

Substituted polyacetylenes

Substituted polyacetylenes

Metathesis

Substituted Polyacetylenes

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