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  • 1970-1974  (5)
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 35 (1970), S. 1208-1210 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archiv der Mathematik 21 (1970), S. 45-49 
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 21 (1971), S. 28-43 
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Wellenfunktion des Grundzustandes von Cyclobutanon, β-Propiolakton, Malonsäureanhydrid, 2-Amino 4-Methylen oxeten und 2-Amino 4-Methylen wird nach einem Rechenverfahren ab initio beschrieben. Die Beziehungen zwischen der Elektronenverteilung und der statischen sowie dynamischen Eigenschaften dieser Molekule wird untersucht.
    Abstract: Résumé On décrit des calculs ab initio de la fonction d'onde de l'état fondamental de la cyclobutanone, de la β-propiolactone, de l'anhydride malonique, de l'amino-2 méthylène-4 oxétène et de l'amino-2 méthylène-4 azétine. On discute les relations entre la structure électronique et les propriétés statiques et dynamiques de ces molécules.
    Notes: Abstract In this work, we report an all-electrons SCF-LCGO-MO computation for the ground state wave-functions of the cyclobutanone, β-propiolactone, malonic anhydrid, amino-2 methylen-4 oxetene and amino-2 methylen-4 azetine molecules. Theoretical results are compared with experimental ones.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Complex formation, ε-values and stoichiometry of charge-transfer complexes of TCNE and TCNQ respectively with substituted spiro-cyclopropane-1.9′-fluorene derivatives as well as with a dimer and a oligoester of the same type have been determined. In general, TCNQ complexes show CT-bands at longer wavelengths than TCNE complexes. TCNE-complexes of the cis-isomers have been proven to be more stable than those of the trans-isomers.
    Notes: Komplexbildungskonstanten, molare Extinktionskoeffizienten und Stöchiometrie der CT-Komplexe von Tetracyanäthylen (TCNE) und Tetracyanchinodimethan (TCNQ) mit substituierten Spirocyclopropan-1.9′-fluoren-Verbindungen sowie mit einem Dimeren und einem Oligoester wurden mittels spektroskopischer Methoden bestimmt. Die TCNQ-Komplexe haben längerwellige CT-Banden als die TCNE-Komplexe. Die TCNE-Komplexe der cis-Isomeren sind stabiler als die der trans-Isomeren.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ring Expansion of a three- to a five-membered cyclic structure in conjunction with loss of a carbalkoxy radical from the molecular ions is postulated for a series of 2,3-dicarbal-koxy-spiro-cyclopropane-1,9′-fluorenes. Initial rupture of the strained spiro-cyclopropane system with destruction of the distinct molecular geometry is inferred from virtually identical spectral patterns of, cis- and trans-isomers, whereas reclosure of the ‘open’ intermediate to a cyclopentadiene ring can be deduced from the secondary decomposition of the resulting (M-COOR) fragments. These latter ions exhibit loss of the second carbalkoxy group together with a hydrogen atom of unusual positional origin (1′ or its equivalent 8′) to form a pair of neutral species, ROH and CO. Since the ejection of hydrogen from aromatic positions can be taken as evidence of rearomatisation in the course of substitution, this origin is liable to mark the site of the new ring junction and thus to reflect the size of the enlarged cyclic moiety.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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