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  • 1
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 3 (1990), S. 295-300 
    ISSN: 0894-3230
    Keywords: Organic Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The molecular structure of [4]paracyclophane was optimized at the semiempirical MNDO and the ab initio STO-3G level. A comparison of the results showed that the benzene ring is much less bent at the STO-3G level. Although some bond alternation is predicted at both levels of theory, the aromatic carbon-carbon bond lengths are still in the range typical of highly delocalized compounds. The calculated strain energy [SE(tot.)] of [4]paracyclophane is larger for the STO-3G structure. Nevertheless, the distributions of SE(tot.) over the bent benzene ring [SE(bb.)] and the oligomethylene bridge [SE(br.)] are the same for the MNDO and STO-3G structures.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1978 (1978), S. 214-226 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mechanism of Pyrolytic Formation of 10-Aryl-9-arsaanthracenesA cross-over experiment with 5b and 5c has proved the novel, synthetically useful pyrolytic formation of 10-aryl-9-arsaanthracenes 8 from 9-aryl-10-benzyl-9,10-dihydro-9-arsaanthracenes 5 to proceed by a radical mechanism involving intramolecular 1,4-migration of the aryl group (Scheme 2, pathway A). Radicals 6 and 9 are intermediates. When generated at lower temperature in solution, radicals of type 6 dimerize to yield tetraarylethanes (Scheme 6).
    Notes: Durch einen Kreuzungsversuch mit 5b und 5c wird bewiesen, daß die neuartige, synthetisch brauchbare pyrolytische Bildung von 10-Aryl-9-arsaanthracenen 8 aus 9-Aryl-10-benzyl-9, 10-dihydro-9-arsaanthracenen 5 radikalisch unter intramolekularer 1,4-Wanderung der Arylgruppe verläuft (Schema 2, Weg A). Zwischenstufen sind die Radikale 6 und 9. Wenn Radikale vom Typ 6 bei niedriger Temperatur in Lösung erzeugt werden, dimerisieren sie zu Tetraarylethanen (Schema 6).
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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