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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 4 (1992), S. 43-49 
    ISSN: 0899-0042
    Keywords: chiral discrimination ; enantiomeric separation ; chiral solvating agents ; asymmetric synthesis ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Polymerisation von optisch aktiven α-Olefinen, wie (R)-4-Phenyl-1-hexen (1) und (S)-5-Phenyl-1-hepten (2), mit ZIEGLER-NATTA-Katalysatoren wie TiCl3/(„ARA“) oder VCl4/Al[CH2CH(CH3)2] wird untersucht. 2 liefert Polymere, die bei Raumtemperatur amorph sind; kein Beweis sterischer Ordnung wird durch IR-Untersuchung erhalten, aber 1H-NMR-Spektren zeigen die Anwesenheit einer partiellen Stereoregularität an. Im Gegensatz dazu liefert 1 Polymere, die in siedenden Lösungsmitteln vorwiegend unlöslich sind und die nach den Röntgendiagrammen kristallin sind, was auf das Vorhandensein von isotaktischen Strukturen hinweist. Durch die Copolymerisation von 1 mit 4-Methyl-1-penten werden kristalline Polymere erhalten, die wahrscheinlich statistische coisotaktische Struktur besitzen, wie mit Hilfe der Röntgendiagramme der IR-Spektren und des Drehungsvermögens gezeigt wird.
    Notes: The polymerization of optically active phenyl-α-olefins, such as (R)-4-phenyl-1-hexene (1) and (S)-5-phenyl-1-heptene (2), has been performed by TiCl3/(“ARA”) or VCl4/Al[CH2CH(CH3)2]3 catalyst. 2 gives polymers which are amorphous at room temperature; no evidence of stereoregularity is obtained by IR investigation, whereas 1H-NMR spectra seem to give some indication of steric order. By contrast, the polymers from 1, which are largely insoluble in boiling solvents, are crystalline at X-ray examination according to an isotactic structure. The copolymerization of 1 with 4-methyl-1-pentene (3) gives statistical copolymers which appear to be coisotactic. This is confirmed by crystallinity at X-ray examination, IR and optical activity data.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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