Concepts of Polymer Stereochemistry

Goodman, Murray

doi:10.1002/9780470147115.ch2

Cited by 13 publications

(3 citation statements)

References 112 publications

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“…This is shown in Fig. 8-14, where it is proposed that the carbon-carbon bond in the monomer unit rotates after addition of the monomer to the polymer chain so as to avoid the 1,2-interactions in the fully eclipsed conformation [Goodman, 1967]. Syn addition to the cis monomer would yield the erythrodiisotactic polymer.…”

Section: -4g Direction Of Double-bond Openingmentioning

confidence: 99%

“…Configuration is the relative orientation in space of the atoms of a stereoisomer, independent of spatial changes that occur by rotations about single bonds [Blei and Odian, 2000;Farina, 1987;Farina and Bressan, 1968;Goodman, 1967]. Cis-trans (geometric) isomers arise from different configurations of substituents on a double bond or on a cyclic structure.…”

Section: -1 Types Of Stereoisomerism In Polymersmentioning

confidence: 99%

“…Highly syndiotactic polymers have been obtained in only a few instances-with some monomers containing bulky substituents, such as a-methylvinyl methyl ether, trimethylvinyloxysilane, and menthyl vinyl ether, in polar solvents under homogeneous conditons [Goodman and Fan, 1968;Ledwith et al, 1979;Murahashi et al, 1966]. That less hindered monomers in polar solvents do not yield highly syndiotactic polymers may be indicative of the involvement of ether monomers in intramolecular solvation of propagating centers.…”

Section: -12b Vinyl Ethersmentioning

confidence: 99%

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Stereochemistry of Polymerization

Odian

2004

Principles of Polymerization

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Constitutional (formerly: structural) isomerism is encountered when polymers have the same overall chemical composition (i.e., same molecular formula) but differ in connectivitythe order in which the atoms are connected to each other. Polyacetaldehyde, poly(ethylene oxide), and poly(vinyl alcohol) are constitutional isomers. The first two polymers are CH CH 3 O C H 2 CH OH CH 2 CH 2 O n n Polyacetaldehyde Poly(ethylene oxide) Poly(vinyl alcohol) n obtained from isomeric monomers, acetaldehyde and ethylene oxide. The third is obtained by hydrolysis of poly(vinyl acetate) since vinyl alcohol does not exist (it is the enol form of acetaldehyde). Poly(methyl methacrylate) and poly(ethyl acrylate) are isomeric polymers CH 2 C CH 3 CO 2 CH 3 CH 2 CH CO 2 C 2 H 5 n n Poly (methyl methacrylate) Poly (ethyl acrylate) formed from isomeric monomers. Poly(E-caprolactam) and poly(hexamethylene adipamide) are isomeric even though the monomers are not isomeric. Similarly, the 1 : 1 copolymer of Principles of Polymerization, Fourth Edition.

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Section: -4g Direction Of Double-bond Openingmentioning

confidence: 99%

Section: -1 Types Of Stereoisomerism In Polymersmentioning

confidence: 99%

Section: -12b Vinyl Ethersmentioning

confidence: 99%

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Stereochemistry of Polymerization

Odian

2004

Principles of Polymerization

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The Stereochemistry of Linear Macromolecules

Farina¹

1987

Topics in Stereochemistry

205

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Asymmetrische Synthesen mit homogenen Übergangsmetallkatalysatoren

Bogdanović

Henc

et al. 1973

Angewandte Chemie

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Zum Gedenken an Kml ZieglerDer Fortschritt auf dem Gebiet der homogenen Katalyse in den letzten funf bis sechs Jahren ist gekennzeichnet u. a. durch die Entwicklung hochselektiver Katalysatoren fur asymmetrische Synthesen. Mit wohldefinierten ubergangsmetallkatalysatoren lassen sich bei asymmetrischen Hydrierungen in hornogener Phase optische Ausbeuten von 85 bis uber 90% erzielen. Bei katalytischen Reaktionen, bei denen die chiralen Zentren i m Zuge von C-C-Verknupfungen entstehen, wurden optische Ausbeuten von 70 bis 80 % erreicht.Als Katalysatoren fur die Hydrierungen dienen vornehmlich Rhodium(1)-Komplexe rnit ,,Homer-Phosphanen", Phosphanen mit chiralen C-Atomen oder optisch aktiven Amiden. Fur die C-C-Verkniipfungen unter Induktion optischer Aktivitat haben sich Katalysatoren bewahrt, die aus n-Allylnickelhalogeniden, Lewis-Sauren und Phosphanen rnit chiralen C-Atomen gewonnen werden. Die Ergebnisse bedeuten einen Durchbruch auf einem Katalysegebiet, das bisher Enzymen vorbehalten war.

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Concepts of Polymer Stereochemistry

Cited by 13 publications

References 112 publications

Stereochemistry of Polymerization

Stereochemistry of Polymerization

The Stereochemistry of Linear Macromolecules

Asymmetrische Synthesen mit homogenen Übergangsmetallkatalysatoren

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