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  • Chemistry  (2)
  • 1975-1979  (2)
  • 1
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The 70 eV electron impact mass spectra of a series of substituted 1-phenylnaphthalenes and their corresponding 1,4-dihydro-1-naphthols have been studied. Plausible fragmentation modes which account for the formation of all the major ions are proposed. An interesting hydrogen transfer reaction, leading to major fragments through the elimination of methanol, seems to proceed via an 8-membered transition state mechanism.
    Notes: Une étude par spectrométrie de masse d'une série de phényl;-1 naphtalenes substitués et des dihydro-1,4napthols-1 correspondants permet de proposer des modes de formation plausibles pour tous les ions importants. L'élimination de méthanol, qui aboutit à des ions majeurs, fait probablement intervenir le transfert d'un atome d'hydrogène par un état de transition à huit atomes.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 62 (1979), S. 699-710 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The processes involved in photoenolisations are theoretically simulated by an ab initio SCF-CI method, using cis-2-butenal as a prototype structure. The prominent role of the hydroxyl group conformation in the resulting transient (2a) is emphasized; its rotation ‘out of the reaction site’ allows the next reaction paths to proceed exothermally. The equilibration of the different types of twisted biradicals in the triplet manifold, which only involves a low energy barrier, is thus possible, populating in quite equal weights the precursors of both E- and Z-dienols. In the singlet state, the formation of the Z-isomer is expected to be kinetically dominant. An examination of the role of the substituents suggests that, in related systems, the steric crowding induces important structural relaxation of the dienol geometries.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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