1965
DOI: 10.1002/hlca.19650480410
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Ist die Molekel ein Biradikal?

Abstract: Volumen 48, Fasciculus 4 (1965) -No. 80 751 80. 1st die Molekel ein Biradikal? (Cyclohepta[def] fluoren) von P. Baumgartnerl), E. Weltin2), G. Wagni&re3) und E. Heilbronnerl) (23. 111. 65) Molekeln mit einer geraden Zahl von Elektronen sind normalerweise diamagnetisch (Singulett-Grundzustand). In gewissen Fallen konnen sie aber auch als paramagnetische Biradikale vorliegen (Triplett-Grundzustand) . Spezialisiert auf aromatische Kohlenwasserstoffeund nur von solchen sol1 in der vorliegenden Arbeit die Rede sein… Show more

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Cited by 55 publications
(19 citation statements)
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“…In contrast to the kata‐condensed π‐extended azulenes, those with additional benzene rings peri ‐condensed between the five‐ and the seven‐membered rings are rarer . Although an azulene with one peri ‐condensed benzene was realized already in 1958, efforts to synthesize azulene compounds with two peri ‐condensed aromatic units have failed, because these structures are proposed to have biradical triplet ground state character, making them highly reactive.…”
Section: Methodssupporting
confidence: 69%
“…In contrast to the kata‐condensed π‐extended azulenes, those with additional benzene rings peri ‐condensed between the five‐ and the seven‐membered rings are rarer . Although an azulene with one peri ‐condensed benzene was realized already in 1958, efforts to synthesize azulene compounds with two peri ‐condensed aromatic units have failed, because these structures are proposed to have biradical triplet ground state character, making them highly reactive.…”
Section: Methodssupporting
confidence: 69%
“…-Some time ago it has been suggested [37] that 1 [6] is best regarded as a /14]annulene perturbed by a central double bond. This view is supported by semi-empirical calculations [38] and by the ESR.…”
Section: Dicyclohepta[cdgh]pentalene (1)mentioning
confidence: 99%
“…The inner perimeters of l b and 2b are aromatic according to the bond lengths patterns, whereas the outer perimeters possess important bond length alternation. The symmetry reduction and the double bond fixation could not be detected by ordinary welectronic approaches, as demonstrated by the theoretical studies of l b [27,28]. All radial bonds of l b and 2b are quasisingle bonds.…”
Section: Geometries and Electronic Structuresmentioning
confidence: 94%