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  • Analytical Chemistry and Spectroscopy  (17)
  • Physics  (7)
  • SPACE VEHICLES  (3)
  • 1975-1979
  • 1970-1974  (27)
  • 1965-1969
  • 1973  (9)
  • 1970  (18)
Collection
Keywords
Publisher
Years
  • 1975-1979
  • 1970-1974  (27)
  • 1965-1969
Year
  • 1
    Electronic Resource
    Electronic Resource
    Oxidative carbon-carbon coupling. III. Oxidative polymerization of bifunctional arylcyanoacetic esters (1973)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 11 (1973), S. 345-352 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bifunctional arylcyanoacetic esters were oxidatively coupled to high molecular weight, colorless, amorphous polymers, soluble in common organic solvents. Brittle films were obtained by casting or compression molding. Thermal stability of the polymers is poor due to the weak C—C bond formed by oxidative coupling. Radical dissociation-recombination of this bond (evidenced by ESR) results in meso-dl equilibration, lowering the Tg of the polymers.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1973.170110203
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  • 2
    Electronic Resource
    Electronic Resource
    Configurations and conformations in acyclic, unsaturated hydrocarbons. A 13C NMR study (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 147-153 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 13C NMR (CMR) spectra of a number of di- and trisubstituted ethylenes have been measured. Very consistent values are found for the differential shieldings of allylic carbons in a number of linear, (Z)- and (E)-disubstituted ethylenes. The discrepancies between the several structural elements are explained tentatively by assuming different rotational preferences in the (Z)-isomers, the (E)-isomers, or both. The results obtained for some branched olefins are qualitatively in agreement with conclusions reached in previous 1H NMR (PMR) investigations, with the possible exception of 2,5-diMe-3-hexene.Differential shieldings in trisubstituted ethylenes are larger than in disubstituted ethylenes, probably as a consequence of steric interaction between geminal substituents.It is confirmed, that API's recent relabelling of the isomers of 3-Me-2-hexene was justified. Furthermore, the (E)-configuration is assigned to the high-boiling isomer of 3,4,4-triMe-2-pentene. On the other hand, the high-boiling isomer of 3-Et-4-Me-2-pentene is shown to be the (Z)-isomer. For the isomeric pair of geraniol and nerol, the (E)-configuration is assigned to the former and the (Z)-configuration to the latter, in agreement with our recent PMR investigations.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270050309
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  • 3
    Electronic Resource
    Electronic Resource
    Melting behavior of a natural rubber network under stress (1973)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 11 (1973), S. 2291-2295 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1973.180111118
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  • 4
    Electronic Resource
    Electronic Resource
    Thermodynamics of n-alkane systems and the solution theories of flory and prigogine (1973)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 11 (1973), S. 499-510 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The partial molar excess free enthalpies and enthalpies as well as the molar excess enthalpies of a number of n-alkane systems were reexamined within the scope of the polymer solution theory of Flory, Orwoll, and Vrij and that of Prigogine in the version after Delmas, Patterson, and Somcynsky. A semiempirical method was used to obtain characteristic n-alkane data, which obey the principle of corresponding states. By using these data (instead of those from the partition function after Flory and collaborators), a physically realistic interpretation of the excess free enthalpies over the whole concentration range is possible if the combinatorial contribution is purely athermal in nature. Both theories give an enthalpy interaction parameter near zero as expected, whereas neither a significant end effect nor an entropic interaction contribution is apparent from the analyses of the excess free enthalpies. The poor results obtained for the partial excess enthalpies and the enthalpies of mixing reflect the inadequacy of the partition functions on which these modern solution theories are based.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1973.180110308
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  • 5
    Electronic Resource
    Electronic Resource
    Thermodynamic aspects of the partitioning of a solute in a gel-solvent system (1973)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 11 (1973), S. 3017-3020 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An expression is derived for the partitioning of a solute molecule in a two-phase system: swollen gel and free solvent. The approach is thermodynamic, and no specific mechanism for the accessibility of the solute to the gel is assumed. Instead, general interaction terms between the components, i.e., polymer-solvent-solute, are introduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1973.170111120
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  • 6
    Electronic Resource
    Electronic Resource
    Mass spectrometry of aralkyl compounds with a functional group - VIII: Comparison of the breakdown of 3-phenylnitropropane with that of 3-phenylpropyl nitrite upon electron-impactPart of the thesis of N. M. M. Nibbering. (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 487-506 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mass spectra of 3-phenylnitropropane and of its analogues, specifically deuterated in the aliphatic chain and in the phenyl ring, show that the molecular ion loses a molecule of water in two different modes, viz. either with both α-hydrogen atoms or with a γ- and an ortho-hydrogen atom. Moreover, a molecule of nitric oxide is eliminated from the molecular ion and the resulting [M - NO]+-ion appears to decompose further in many complicated ways. This loss of nitric oxide does not arise from an isomerization of the nitro group to a nitrite group, because the [M - NO]+-ion of 3-phenylpropyl nitrite breaks down in an altogether different manner than that of 3-phenylnitropropane. This is demonstrated by the spectra of specifically deuterated analogues of 3-phenylpropyl nitrite.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210030407
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  • 7
    Electronic Resource
    Electronic Resource
    Cyclodimerisation reactions of conjugated dienes with aldehydes - I:We dedicate this work to the late Mr Theo Lefèvre, our former Minister for Scientific Programmation. Formation of tetrahydropyrans and their 300 MHz 1H NMR spectra (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 589-591 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The palladium catalysed reaction of butadiene with aldehydes yields 2-substituted 3,6-divinyl-tetrahydropyrans.1-4 The reaction has been extended to isoprene and myrcene. With formaldehyde only 2,5-substituted pyrans have been isolated. The isomeric tetrahydropyrans obtained were fully characterised by 1H NMR, and representative 300 MHz spectra are given. Attempts to react aldehydes with 2-methoxybutadiene were unsuccessful.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270051208
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  • 8
    Electronic Resource
    Electronic Resource
    The mass spectra of some aliphatic and alicyclic sulphoxides and sulphonesThe essential part of this work has been presented at the fourth Meeting of the British Mass Spectroscopy Group, Sheffield, 16th to 18th September 1969. (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 1561-1588 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Characteristic fragmentation processes of aliphatic sulphoxides and sulphones such as loss of hydroxyl, ‘alkene’ and/or ‘alkenyl’ are associated with hydrogen migrations to oxygen. A study of the mass spectra of di-n-butyl sulphoxide and sulphone, the saturated five-, six- and seven-membered ring sulphoxides and sulphones and their site-specifically deuterated analogues shows that these hydrogen migrations are nonspecific.Apparently steric factors play an important role in determining the relative contributions of initial hydrogen transfer from the various positions. The sites of abstraction probably determine the extent of competition between consecutive or concerted loss of hydroxyl, carbon-sulphur fission or other processes (e.g. McLafferty rearrangement).Apart from the McLafferty rearrangement only the loss of hydroxyl from sulphones shows a strong dependence on the site of initial hydrogen abstraction: γ-hydrogen is lost preferentially, yielding a cyclized [M — OH] ion.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210031214
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  • 9
    Electronic Resource
    Electronic Resource
    Mass spectrometry of aralkyl compounds with a functional group-XFor Part IX, see Ref. 1. A reinvestigation of the structure of the [C8H9]+-ion from 1-phenylethylbromide and of the molecular ion [C8H8]+· from styrene by use of 13C labelling (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 1589-1592 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Specific 13C-labelling in the side-chain of 1-phenylethylbromide and of styrene shows that it is not necessary to assume eight-membered ring structures for the [C8H9]+- and [C8H8]++·-ions to explain the almost complete randomization of all hydrogen atoms, as might be concluded from D-labelling data. It is now suggested that the eight-membered ring is predominantly present in [C8H9]+ and [C8H8]+· ions of low internal energy. In particular this appears to apply to styrene, which generates a cyclooctatetraene molecular ion with the original side-chain carbon atoms still linked together, as shown by 13C-labelling.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210031215
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  • 10
    Electronic Resource
    Electronic Resource
    NMR experiments on acetals - XXXIX: Conformational insights through NMR studies at 300 MHz of 2-methyl-4-halogenomethyl-1,3-dioxolanes (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 299-303 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: NMR spectra of cis- and trans-2-methyl-4-halogeno-methyl-1,3-dioxolanes have been analysed at 300 MHz. Some of the extracted parameters facilitate easy distinction between these 1,3-dioxolanes and the corresponding structurally isomeric 2-Methyl-5-halogeno-1,3-dioxanes. Criteria enabling configurational assignments to be made for the cis-trans isomers of the dioxolane series are tested. The Me-2 group causes an upfield shift (0·2 to 0·3 ppm) of a trans proton at position 5, but the reversed shift for the corresponding cis proton. This competes with, or even overwhelms the effect of the CH2X-4 substituent, which by virtue of its pronounced preferential rotameric orientation and in comparison with a simple Me-group, has no large upfield effect on the shift of the syn-adjacent proton. Shift criteria and coupling constants JH-4, H-5 in cis- and trans derivatives allow further conformational insights into these 1,3-dioxolanes.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270050611
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