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** Benzene derivatives, Yukawa-Tsuno equation **

** Linear free energy relationships Yukawa-Tsuno equation **

In the Yukawa-Tsuno equation (1959)58 (equation 4), the sliding scale is provided by multiple regression on a and (cr+ —

Multiparameter treatments such as the Yukawa-Tsuno equation and the dual substituent-parameter equation have long been important and further treatments have been devised in recent years. A final section is devoted to some of these, with an indication of the place of NO2, NH2 and some other groups in these treatments. [Pg.481]

Equilibrium 42A 42B (R = R = H R = XC6H4) according to the Yukawa-Tsuno Equation" [Pg.280]

R = XC5H4) and the electronic characteristics of the substituent X via the Yukawa-Tsuno equation [Pg.281]

The electronic effect of the substituents on nitro-aromatics is rationalized by the Yukawa-Tsuno equation. [Pg.451]

It is observed that solvolyses of the tertiary benzylic / nitrobenzoates A, B and C are correlated by Yukawa-Tsuno equation with reduced resonance components as indicated by a lower coefficient of the resonance parameter r. Offer an explanation. [Pg.342]

One approach is to correct for the added resonance interaction. This is done in a modification of the Hammett equation known as the Yukawa-Tsuno equation. [Pg.210]

Yukawa, Tsuno and their colleagues have made studies more specifically related to determining substituent constants, which have included both methylsulfinyl and methylsulfonyl groups. Hydroxyl chemical shifts were determined for a large number of m-and p-substituted phenols in DMF and in DMSO. The results were treated by the LArSR relationship (usually called the Yukawa-Tsuno equation, see Section II.B) [Pg.514]

Further insight into the nature of the transition state for carbocation hydration comes from application of the two parameter Yukawa-Tsuno equation (Eq. 21). [Pg.23]

There have been a number of attempts, by the introduction of a further parameter into the Hammett equation, to quantify this graded response—via through-conjugation—on the part of a p-substituent. Among the best known of these is the Yukawa-Tsuno equation, [7], which, in the form shown here, is [Pg.372]

Upward curvature has been observed in the pa plots for stilbene, styrene and a-methylstilbene bromination in methanol (Ruasse and Dubois, 1972 Ruasse et al, 1978 Ruasse and Argile, 1983). In no case can these curvatures be interpreted coherently by Yukawa-Tsuno equations in terms of variable contributions of polar and resonance effects. Application of the multipathway scheme (Ruasse, 1990) leads to the results summarized in Table 4. [Pg.229]

** Benzene derivatives, Yukawa-Tsuno equation **

** Linear free energy relationships Yukawa-Tsuno equation **

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