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  • Chemistry  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 3745-3758 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Some Diels-Alder Additions of BenzvaleneBeing electron-deficient dienes, two 1,2,4,5-tetrazines, one 4,5-dihydropyridazine, two ortho-benzoquinones and hexachlorocyclopentadiene add readily to the electron-rich double bond of benzvalene to form the expected products (5a, b, 7, 9a, b, 16a). Transformation of 9b and 16a renders the new C10H10 isomer tetracyclo[4.4.0.02,4.03,5]deca-7,9-diene (11b) and the new C11H12 isomer pentacyclo[6.2.1.02,7.03,5.04,6]undec-9-ene (16b) respectively easily accessible. The structures of the new compounds are proved by their 13C NMR spectra, which offer an unambiguous criterion for the analysis of such polycycles including the bicyclo[1.1.0]butane system.
    Notes: Zwei 1,2,4,5-Tetrazine, ein 4,5-Dihydropyridazin, zwei ortho-Benzochinone und Hexachlorcyclopentadien liefern als elektronenarme Diene glatt mit der elektronenreichen Doppelbindung des Benzvalens die erwarteten Addukte (5a, b, 7, 9a, b, 16a). Die Umwandlung von 9b und 16a macht das neue C10H10-Isomere Tetracyclo 4.4.0.02,4.03,5]deca-7,9-dien (11b) bzw. das neue C11H12-Isomere Pentacyclo[6.2.1.02,7.03,5.04,6]undec-9-en (16b) bequem zugänglich. Die Konstitutionen der neuen Verbindungen werden anhand ihrer 13C-NMR-Spektren gesichert, die ein eindeutiges Kriterium für die Analyse derartiger, das Bicyclo[1.1.0]butan-System enthaltender Polycyclen bieten.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 15 (1984), S. 257-263 
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Raman spectra of solid fully deuteriated syndiotactic (D8s-PMMA, 55%) and undeuteriated isotactic (H8i-PMMA, 92%) poly(methyl methacrylate) have been recorded in the 3500-200 cm-1 range at ambient temperature. Vibrational assignments are proposed for most of the observed bands and, in the case of D8s-PMMA, the data have resolved some of the inconsistencies in the spectra of the undeuteriated polymer.
    Additional Material: 2 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 15 (1984), S. 310-318 
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Infrared and Raman spectra have been recorded at various temperatures for the solld gold (I) and gold (III) coordination compounds (CH3)2 SAuX (X = Cl, Br), (CH3)2 SAuCl3 and their perdeuteriated derlvatives. Vibrational assignments are proposed for the observed bands on the basis of modified Urey-Bradley force field calculations. The primary force constants, K(Au-X) and K(Au-S), are essentially independent of the oxidation state of the gold atom. The data also show that (CH3)2S and (CH3)3P have similar trans-directing influences in the ground state. The signs of the interaction constants in the square-planar species, together with the slightly larger trans-to-sulfur Au-Cl stretching force constant in comparison with the corresponding cis value, suggest that the trans-to-sulfur Au-Cl bond is stabilized relative to the cis Au-Cl bonds by the presence of the (CH3)2S ligand.
    Additional Material: 4 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 8 (1979), S. 57-59 
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Raman spectra of [Ag(CO)2]+ and [Cu(CO)4]+ in fluorosulphonic acid at - 50°C have been investigated in the CO stretching region. These data, together with previously reported infrared results, favour D∞h symmetry for the Ag(I) species and Td symmetry for the Cu(I) species. These structures are in accord with those predicted for the complexes using the valence shell electron pair repulsion (VSEPR) theory.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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