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  • 1
    Electronic Resource
    Electronic Resource
    Photoelectron Spectra of Unsaturated Oxides. I. 1,4-Dioxin and related systems (1978)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 61 (1978), S. 1388-1398 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The He (Iα) photoelectron spectra of the four unsaturated oxides 3,4-dihydropyran (6), γ-pyran (7), 2, 3-dihydro-1, 4-dioxin (9) and 1, 4-dioxin (10) are reported and analysed. Band assignments are based on ab-initio calculations, using the STO-3G basis set. The proposed orbital sequences (with reference to the coordinate systems given in Table 1) are, for the top three orbitals: 6, π, nσ, nπ; 7, 3b1(π), 1a2(π), 11a1(σ); 9, 11b(π), 12a(σ), 11a(π); 10, 2b3u(π), 1b1g(π), 6ag(σ). Finally the (almost) localized π-orbitals have been computed by the Foster-Boys localization procedure.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19780610422
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Cyclisch gekreuzt-konjugierte Bindungssysteme, 42. Höhervinyloge Pentafulvalene, Synthesen - Thermolysen (1984)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 2006-2026 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cyclic Cross-Conjugated Bond Systems, 42. Higher Vinylogous Pentafulvalenes, Syntheses - ThermolysesThe (Z)-pentafulvatriene 3, the (Z,Z-pentafulvatetraene 5, the (E,Z,E)-pentafulvapentaene derivative 7 as well as the E-isomers 4/6 have been synthesised. In experiments in solution (50 - 150°C) aimed at thermal electrocyclisation no monomeric products could be identified. Upon thermolysis of 3/4 in the gas phase (500°C) a mixture of the vinyldihydroindacenes 44/48 is obtained, the formation of which is discussed in terms of electrocyclisation reactions.
    Notes: Das (Z)-Pentafulvatrien 3, das (Z,Z)-Pentafulvatetraen 5, das (E,Z,E)-Pentafulvapentaen-Derivat 7 sowie die E-Isomeren 4/6 wurden synthetisiert. Bei Versuchen zur thermischen Elektrocyclisierung in Lösung (50 - 150°C) sind keine monomeren Produkte nachweisbar. Bei der Gasphasenthermolyse (500°C) von 3/4 wird ein Gemisch der Vinyldihydroindacene 44/48 erhalten, deren Bildung über Elektrocyclisierungsschritte diskutiert wird.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19841170603
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  • 3
    Electronic Resource
    Electronic Resource
    Cyclisch gekreuzt-konjugierte Bindungssysteme, 43. (E)-Sesquifulvatrien, Synthese  -  Thermolyse (1984)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 2027-2044 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cyclic Cross-Conjugated Bond Systems, 43. (E)-Sesquifulvatriene, Synthesis - ThermolysisA synthesis for (E)-sesquifulvatriene 4 is described. When 4 is thermolysed (80 - 130°C) or photolysed in solution in order to bring about a 16π-electrocyclisation no monomeric products are obtained. Vapor phase thermolysis (500°C) yields azulene (42%) and benzene probably via initial 10π-electrocyclisation.
    Notes: Eine Synthese für das (E)-Sesquifulvatrien 4 wird beschrieben. Bei der mit dem Ziel einer 16π Elektrocyclisierung durchgeführten Thermolyse (80 - 130°C) bzw. Photolyse in Lösung entstehen keine monomeren Produkte, bei der Gasphasenthermolyse (500°C) Azulen (42%) und Benzol, wahrscheinlich über eine einleitende 10π-Elektrocyclisierung.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19841170604
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  • 4
    Electronic Resource
    Electronic Resource
    Cyclisch gekreuzt-konjugierte Bindungssysteme, 44. Höhervinyloge Heptafulvalene, Synthesen - Thermolysen (1984)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 2045-2062 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cyclic Cross-Conjugated Bond Systems, 44. Higher Vinylogous Heptafulvalenes, Syntheses - ThermolysesThe (Z)/(E)-heptafulvatrienes 3/4, the heptafulvadienine 5, and the heptafulvadienediine 6 are synthesized. In 5/6 selective cis-hydrogenation of the triple bond(s) (to yield 3, 39) is not achieved. Upon thermolysis of 3 in ca. 10-1 M solutions above 70°C isomerisation to 4 takes place, 18π-electrocyclisation occurs, if at all, only to a minor extent.
    Notes: Die (Z)/(E)-Heptafulvatriene 3/4, das Heptafulvadienin 5 und das Heptafulvadiendiin 6 werden synthetisiert. In 5/6 ist eine selektive cis-Hydrierung der Dreifachbindung(en) (zu 3, 39) nicht möglich. Bei der Thermolyse von 3 in ca. 10-1 M Lösungen findet oberhalb 70°C Isomerisierung zu 4, 18 π-Elektrocyclisierung, wenn überhaupt, nur sehr untergeordnet statt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19841170605
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