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  • 1990-1994  (3)
  • radical addition  (2)
  • 25.70.Gh  (1)
  • 05.10.Ln
  • 1
    Electronic Resource
    Electronic Resource
    Electronegativity scheme for reactions involving radical addition to vinyl monomers (1992)
    Springer
    Russian chemical bulletin 41 (1992), S. 1750-1755 
    Details
    ISSN: 1573-9171
    Keywords: vinyl monomers ; radical addition ; reactivity ; correlation schemes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The concept of the apparent electronegativity of a reaction site has been introduced. This has been used to develop a new scheme for calculating the relative rate constants of addition of radicals with different structures to vinyl monomers. The parameters of the scheme are given for 40 reagents. The results of a comparison of calculated and literature rate constants of addition are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00863803
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Transition states in the reaction of radical addition to the vinyl double bond (1993)
    Springer
    Russian chemical bulletin 42 (1993), S. 640-644 
    Details
    ISSN: 1573-9171
    Keywords: vinyl monomers ; radical addition ; MO calculations ; transition states of reaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The transition states for the addition of.CH3, CH3O.,.CCl3,.CF3, and HOO. radicals to the Cβ and Cα atoms of ethylene, propylene, styrerie, acrylonitrile, methyl acrylate, vinyl acetate, and vinyl- and vinylidene chlorides were calculated using the MNDO method. A satisfactory correlation between the heats of reaction and activation energies was found. The calculated coefficients of proportionality, 0.4–0.5, are twice as high as those in the Polyani—Semenov equation. The calculated heat of reaction of radical addition was shown to be as «strong» an index of reactivity as the calculated activation barrier.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00703996
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Inclusive excitation-energy distributions of hot nuclei from 44 MeV/nucleon Ar- and 32 MeV/nucleon Kr-induced reactions (1993)
    Springer
    The European physical journal 346 (1993), S. 201-208 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.Gh ; 25.70.Lm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Inclusive neutron multiplicity distributions were measured by means of 4π liquid-scintillator detectors for Ar and Kr-induced reactions at 44 MeV/nucleon and 32 MeV/nucleon, respectively. For all the systems studied, the observed distributions exhibit a bump structure at large multiplicity, corresponding to highly dissipative collisions. For Ar-induced reactions, the excitation energies necessary to explain the most probable neutron multiplicity associated with these dissipative collisions are estimated, the correspondence between excitation energy and neutron multiplicity being calculated in the framework of the statistical model. The so-obtained values of excitation energies, which are systematically lower than those predicted using the massive-transfer picture, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01306080
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    Paper (German National Licenses)
    Fulltext
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