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  • 3,3-Dimethoxypropanoate  (1)
  • 33.00  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Raman studies of nonlinear phenomena in fullerene crystallites (1993)
    Springer
    Applied physics 57 (1993), S. 299-302 
    Details
    ISSN: 1432-0630
    Keywords: 33.00 ; 35.00 ; 78.30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The resonant Raman scattering of C60 crystallites is monitored as a function of excitation intensity at 514.5 nm. At low intensities, a strong line at 1468 cm−1 is observed. No feature at 1459 cm−1 is observable. With increasing intensities, the 1468 cm−1 line shifts continuously and reversibly to lower frequencies. The mode softening is nonlinearly dependent on the input intensity and is accompanied by a nonlinear increase in the Raman intensity. The spectral changes are discussed in terms of a nonlinear reduction in force constant and increase in bond polarisability as a result of an increased intermolecular delocalisation of the π-electron cloud. The nonlinear changes are associated with the nonlinear luminescence and photoconductive response observed in fullerenes and are contrasted to the irreversible phototransformation recently discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332280
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  • 2
    Electronic Resource
    Electronic Resource
    Ozonolyse von Olefinen, III: Säurekatalysierte Ozonolyse von 3-Hexen-1,6-und 2-Penten-1,5-dicarbonylderivaten (1990)
    Springer
    Monatshefte für Chemie 121 (1990), S. 203-207 
    Details
    ISSN: 1434-4475
    Keywords: Ozonolysis ; 3-Hexene-1,6-dioic acid ; Glutaconic acid ; 3,3-Dimethoxypropanoate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The ozonolysis of mono-unsaturated compounds containing the structural element =CH-CH2-R [R=COOH, COOCH3, CH(OCH3)2] was investigated. Reductive ozonolysis of (E)-3-hexene-1,6-dioic acid gives methyl 3,3-dimethoxypropanoate (2), whereas ozonolysis of dimethyl (E)-3-hexene-1,6-dioate (1a) and (Z)-1,1,6,6-tetramethoxy-3-hexene (1b) in a methanolic solution of HCl leads to a mixture of2, dimethyl malonate (3 a) and 1,1,3,3-tetramethoxypropane (3 b). The homologuos derivatives, dimethyl glutaconate (4 a) and 1,1,5,5-tetramethoxy-2-pentene (4 b), were ozonized to give mixtures of2, 3, dimethyl oxalate (5), methyl 2,2-dimethoxyacetate (6 a), and 1,1,2,2-tetramethoxyethane (6 b). The ratios of the various reaction products were determined by gas chromatography. In each case the formation of the bifunctional derivatives2 and6 a was favoured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00809533
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