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  • Photochemistry  (3)
  • Activation  (2)
  • Heterocycles
  • Wiley-Blackwell  (7)
  • Blackwell Publishing Ltd
  • 1965-1969  (7)
  • 1969  (7)
Collection
Keywords
Publisher
  • Wiley-Blackwell  (7)
  • Blackwell Publishing Ltd
Years
  • 1965-1969  (7)
Year
  • 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
    Mechanistic Organic Photochemistry (1969)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 8 (1969), S. 1-11 
    Details
    ISSN: 0570-0833
    Keywords: Photochemistry ; Rearrangement ; Reaction mechanisms ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Organic photochemical reactions can be understood as transformations of the electronically excited states of the reactant molecules. By considering Lewis structure or molecular orbital representations of these excited states it is possible to outline the several possible reactions available in the case of a given reactant. A number of different types of photochemical transformations are now reasonably well understood. In these cases one finds the same common controlling feature, namely the tendency for an excited state species to follow mechanistic pathways of minimum energy and the requirement for continuous electron redistribution in following these pathways. These preferred transformations can often be selected by inspection of relative bond orders for different types of bonding, by comparison of the potential energy surfaces available to the excited state molecules, and by use of correlation diagrams. The reactions derive from both singlet and triplet states, and one of the more reliable methods now available for identifying excited states reacting is termed the “fingerprint method”. Examples of the author's mechanistic approach are given both for ketone and for hydrocarbon photochemistry.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.196900011
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Deactivation of Excited StatesContribution No. 3625 from the Gates and Crellin Laboratories of Chemistry. (1969)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 8 (1969), S. 261-270 
    Details
    ISSN: 0570-0833
    Keywords: Deactivation ; Excited states ; Photochemistry ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Nature abhors an electronically excited state and strives to convert this energy to other forms. This article is concerned with the various pathways involved in the degradation of electronic excitation to ordinary “thermal” forms, but will primarily discuss the quenching of excited states by other molecules. The authors include as examples only those phototransformations and interactions encountered in solution.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.196902611
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  • 5
    Electronic Resource
    Electronic Resource
    ExcimersDedicated to Professor H. Bredereck on the occasion of his 65th birthday (1969)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 8 (1969), S. 333-343 
    Details
    ISSN: 0570-0833
    Keywords: Excimers ; Photochemistry ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Excimers are molecular associates that exist only in excited electronic states. They are therefore detectable only in emission spectra, and particularly in fluorescence spectra. Despite their short lifetimes, they are responsible for many photophysical and photochemical effects.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.196903331
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  • 6
    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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  • 7
    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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