Directive effects, in aromatic substitution

Directive effects, in aromatic substitution, a quantitative treatment of, 1, 35... [Pg.336]

Directive effects, in aromatic substitution, a quantitative treatment of, 1, 35 Directive effects, in gas-phase radical addition reactions, 16, 51 Discovery of mechanisms of enzyme action 1947-1963, 21, 1 Displacement reactions, gas-phase nucleophilic, 21, 197 Donor/acceptor organizations, 35, 193... [Pg.403]

A QUANTITATIVE TREATMENT OF DIRECTIVE EFFECTS IN AROMATIC SUBSTITUTION... [Pg.35]

Accordingly, directive effects in aromatic substitution are interpreted on the basis of the factors influencing the stability or instability of the benzenium ions. [Pg.43]

Inspection of the am and ap constants for Me3Si suggests that this substituent will be weakly activating, but will not have a significant directing effect in aromatic substitutions. [Pg.900]

The values of = —0.04 and Op = —0.07 for the trimethylsilyl substituent compare with values of —0.07 and —0.17 for the methyl substituent and values of —0.10 and —0.20 for the t-butyl substituent Hence compared with alkyl groups the MesSi group has a modest electronic effect in both the meta and para positions. The and Op constants suggest that McsSi will be a weakly activating substituent, but will not have a significant directing effect in aromatic substitutions. [Pg.360]

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