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  • Artikel  (9)
  • Wiley-Blackwell  (9)
  • 2005-2009
  • 1980-1984  (9)
  • 1975-1979
  • 1982  (9)
  • 1
    Digitale Medien
    Digitale Medien
    Copolymerization of β-pinene with styrene oxide and N-vinylpyrrolidone (1982)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 20 (1982), S. 1279-1285 
    Details
    ISSN: 0360-6376
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The copolymerization of β-pinene with styrene oxide (SO) and β-pinene with N-vinylpyrrolidone (VP) was investigated by using SnCl4 in dichloromethane diluent at low temperature. Monomer reactivity ratios were evaluated for both copolymers at -80°C; these are r1(SO) = 2.979 and r2(β-pinene) = 0.002 and r1(VP) = 0.096 and r2(β-pinene) = 0.294.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1982.170200511
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  • 2
    Digitale Medien
    Digitale Medien
    The cationic polymerization of 2-alkenylfurans, 2Part 1: cf.5. A side reaction leading to polyunsaturated products (1982)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 183 (1982), S. 2399-2413 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: A spectroscopic and conductimetric study of the cationic polymerization of 2-vinylfuran (1) and 2-methyl-5-venylfuran (2) showed the existence of an important side reaction originating from a hydride-ion shift from an unsaturated polymer molecule to an active species. The resulting allylic carbocation, in equilibrium with a doubly unsaturated polymer molecule, can react further and the repetition of the mechanism on progressively more conjugated species leads to the formation of a series of highly charge-delocalized carbenium ions absorbing throughout the visible region of the spectrum (and giving high electrical conductivity) and of neutral polyconjugated polymer molecules. Since the hydride-ion abstraction occurs from the tertiary carbon atom of the vinylic chain, vinylidene polymers of monomers such as 2-isopropenylfuran (3) and 2-isopropenyl-5-methylfuran (4) are not susceptible to it. Indeed, their cationic polymerization proceeds without colour formation and conductivity increase.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1982.021831010
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  • 3
    Digitale Medien
    Digitale Medien
    Vinylkationen, 36. Solvolyse von Cycloalkylidenmethyl- und 1-Cyclopenten-1-yl-triflaten (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 772-782 
    Details
    ISSN: 0009-2940
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Vinyl Cations, 36. Solvolysis of Cycloalkylidenemethyl and 1-Cyclopenten-1-yl TriflatesCyclohexlidenemethyl triflate (2), cyclobutylidenemethyl triflate (5), 1-cyclopenten-1-yl triflate (7), bicyclo [3.1.0]hex-2-en-2-yl triflate (9), 1-cyclobutylideneethyl triflate (19), and 2-methyl-1-cyclopenten-1-yl triflate (29) were solvolyzed in solvents of various ionizing power and nucleophilicity and the solvolysis products were identified. The cyclobutylidenealkyl triflates solvolyze via a vinyl cation mechanism involving ion pairs with rearrangement to cyclopentene and cyclopentanone compounds. The 1-cyclopenten-1-yl triflates do not produce vinyl cation intermediates but give only the corresponding ketones via an O—S bond cleavage of the triflate group.
    Notizen: Cyclohexylidenmethyl-triflat (2), Cyclobutylidenmethyl-triflat (5), 1-Cyclopenten-1-yl-triflat (7), Bicyclo[3.1.0]hex-2-en-2-yl-triflat (9), 1-Cyclobutylidenethyl-triflat (19) und 2-Methyl-1-cyclopenten-1-yl-triflat (29) wurden in Lösungsmitteln verschiedener Ionisierungsstärke und Nucleophilie solvolysiert und die Solvolyseprodukte aufgeklärt. Die Cyclobutylidenalkyl-triflate solvolysieren über Ionenpaarmechanismen (Vinylkationen) unter Umlagerung zu Cyclopenten- und Cyclopentanon-Derivaten. Die 1-Cyclopenten-1-yl-triflate reagieren nicht über Vinylkationen als Zwischenstufe, sondern unter O—S-Spaltung zu den entsprechenden Ketonen.
    Zusätzliches Material: 6 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19821150238
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  • 4
    Digitale Medien
    Digitale Medien
    The mechanism of O3-aldehyde reactions (1982)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 14 (1982), S. 237-249 
    Details
    ISSN: 0538-8066
    Schlagwort(e): Chemistry ; Physical Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A new mechanism is proposed for gas-phase O3-aldehyde reactions. Certain aspects of the new mechanism may be applicable also to O3-aldehyde reactions in solution. The proposed mechanism involves initiation by addition of O3 across the aldehydic C=O bond. The initiation process and the subsequent chemistry together represent an exact analogue of the Criegee mechanism for O3-alkene reactions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/kin.550140304
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  • 5
    Digitale Medien
    Digitale Medien
    Kinetics and energetics of the criegee intermediate in the gas phase. II. The criegee intermediate in the photooxidation of formaldehyde, in alkyldioxy disproportionation and O + oxoalkane addition reactions (1982)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 14 (1982), S. 225-236 
    Details
    ISSN: 0538-8066
    Schlagwort(e): Chemistry ; Physical Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The gas-phase kinetics and energetics of the Criegee intermediate, deduced from studies of O3-alkene systems, suggest that a hydroxy-substituted Criegee intermediate probably participates in the photooxidation of formaldehyde. In contradistinction, the existing evidence suggests that the Criegee intermediate and its isomers are probably not involved in alkyldioxy disproportionation reactions. In the case of O + oxoalkane addition reactions, the Criegee intermediate and its isomers are discussed in terms of a complex equilibrium: .
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/kin.550140303
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  • 6
    Digitale Medien
    Digitale Medien
    Cyclobutane production via the O3--thiolane reaction (1982)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 14 (1982), S. 439-445 
    Details
    ISSN: 0538-8066
    Schlagwort(e): Chemistry ; Physical Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/kin.550140410
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  • 7
    Digitale Medien
    Digitale Medien
    A new look at the crystallization of polyethylene. II. Crystallization from the melt at low supercoolings (1982)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 20 (1982), S. 1717-1732 
    Details
    ISSN: 0098-1273
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: This article is part of the general project laid out in Part I (ref. 9) and is concerned with obtaining information on primary (unthickened) crystals of polyethylene formed at low supercoolings. For this, a technique had to be devised by which crystallization could be speeded up so as to eliminate or at least reduce lamellar thickening. Indeed we were able to increase the rate of crystallization by an order of magnitude using a technique which we have called enhanced self-nucleation. Using this technique we find that when viewed under an optical microscope, spherulites crystallize uniformly over the field of view, and not, as is usual, by a radial growth process. Isothermal crystallization in bulk linear polyethylene has been studied by means of the enhanced self-nucleation technique as a function of crystallization time by using Raman LAM and melting points to assess variations of fold length Data have been obtained at very much shorter times than before. At short times, we find a constant fold length; at longer times the crystals thicken linearly with the logarithm of time. Values of the initial fold length for crystallization temperatures between 118 and 130°C are presented. Associated with the thickening at short times we find an induction time which increases with temperature.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1982.180200921
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  • 8
    Digitale Medien
    Digitale Medien
    Influence of enol acetylation on the photo-fries rearrangement of an ortho-acylaryl benzoate (1982)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 2238-2243 
    Details
    ISSN: 0170-2041
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Einfluß der Enol-Acetylierung auf die Photo-Fries-Umlagerung eines Benzoesäure-ortho-acylarylestersDas Enolacetat 1b erleidet bei Bestrahlung Spaltung der Benzoyl-Sauerstoff-Bindung, wobei eine Mischung der Benzophenone 4 und 5 resultiert. Die primär entstehenden Photo-Fries-Produkte 2 und 3 konnten infolge einer schnellen intramolekularen Umacetylierung nicht isoliert werden. Das Acetophenon 6 lagert sich unter den gleichen experimentellen Bedingungen zu den Benzophenonen 7 und 8 um, jedoch sind die Ausbeuten bemerkenswert niedriger als im obigen Fall. Die Verbindungen 7 und 8 werden durch Acetanhydrid in Gegenwart von Pyridin in die jeweiligen Essigsäureester 4 und 5 übergeführt.
    Notizen: The enol acetate 1b undergoes benzoyl-oxygen bond rupture upon irradiation, giving a mixture of benzophenones 4 and 5. The primary photo-Fries products 2 and 3 could not be isolated, due to a rapid intramolecular transacetylation. The acetophenone 6 rearranges to give the benzophenones 7 and 8 under the same conditions, but the yields are significantly lower than in the former case. Compounds 7 and 8 are separately correlated with 4 and 5 by treatment with acetic anhydride in the presence of pyridine.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jlac.198219821214
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  • 9
    Digitale Medien
    Digitale Medien
    Kinetics and energetics of the criegee intermediate in the gas phase. I. The criegee intermediate in ozone-alkene reactions (1982)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 14 (1982), S. 201-224 
    Details
    ISSN: 0538-8066
    Schlagwort(e): Chemistry ; Physical Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The chemistry and energetics of the Criegee intermediate, a primary product of the ozonolysis of alkenes, are discussed in terms of recent ab-initio calculations and laboratory studies. The experimental observations in O3-alkene systems can be rationalized on the basis of a general mechanism: where the
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/kin.550140302
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