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  • Activation  (2)
  • Heterocycles
  • Wiley-Blackwell  (4)
  • Blackwell Publishing Ltd
  • 1965-1969  (4)
  • 1969  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Hetero Analogs of SesquifulvaleneFrom the Habilitation Thesis by G. Seitz, Universität Marburg 1968, also Part 4 of Cyclopentadienylidenes. - Part 3: Tetrahedron Letters 1968, 2305. (1969)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 8 (1969), S. 478-482 
    Details
    ISSN: 0570-0833
    Keywords: Sesquifulvalenes ; Fulvalene ; Heterocycles ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Heterosesquifulvalenes containing sulfur or oxygen as hetero atom may be prepared, e.g., by condensation of cyclopentadienes with thiopyrones or pyrones in acetic anhydride. Heterosesquifulvalenes containing nitrogen can be obtained from the oxygen compounds by O,N-exchange. The ground state of all these compounds is determined mainly by the nonpolar resonance formula.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.196904781
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  • 2
    Electronic Resource
    Electronic Resource
    Small Charged Heterocycles (1969)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 8 (1969), S. 962-974 
    Details
    ISSN: 0570-0833
    Keywords: Heterocycles ; Aziridinium salts ; Azetidinium salts ; Cycloaddition ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis and important reactions of stable aziridinium salts are described in this article. The more stable azetidinium salts, which undergo similar reactions, have also been studied. Polar and dipolar cycloadditions produce heterocycles by ring expansions that can be represented as .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.196909621
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  • 3
    Electronic Resource
    Electronic Resource
    The Meaning and Use of the Arrhenius Activation Energy (1969)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 8 (1969), S. 438-444 
    Details
    ISSN: 0570-0833
    Keywords: Activation ; Activation ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The nature of the Arrhenius activation energy and frequency factor is reexamined in terms of information now becoming available on the microscopic aspects of collisional reactions. It is pointed out that the activation energy is not generally equal to the threshold for reaction, and its correct conceptual meaning is discussed. The temperature dependence of this quantity and its relation to the threshold energy is developed for a number of representative forms of the energy dependence of the reaction cross-section (excitation function). The uses and limitations of the activation energy as a means of evaluating thresholds, excitation functions, and the presence of tunneling processes are discussed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.196904381
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  • 4
    Electronic Resource
    Electronic Resource
    Non-Enzymatic Activation of Molecular Nitrogen (1969)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 8 (1969), S. 650-659 
    Details
    ISSN: 0570-0833
    Keywords: Activation ; Nitrogen fixation ; Nitrogen fixation ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Several transition metal complexes that can absorb nitrogen from the gas phase are now known. Some of the N2-metal complexes are stable enough to be isolated and their structure elucidated, the N2 molecule remaining chemically inert. In other cases reduction to N3- is possible, but the structure of the reactive intermediate N2-metal complex can be approached only by mechanistic studies. In the stable complexes the nitrogen is bound via a lone pair of electrons in the direction of the molecular axis (“end-on”), in the reducible complexes possibly “edge-on”.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.196906501
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