The Yukawa–Tsuno equation, first developed in 1959, is a linear free-energy relationship in physical organic chemistry. It is a modified version of the Hammett equation that accounts for enhanced resonance effects in electrophilic reactions of para- and meta-substituted organic compounds. This equation does so by introducing a new term to the original Hammett relation that provides a measure of the extent of resonance stabilization for a reactive structure that builds up charge (positive or negative) in its transition state. The Yukawa–Tsuno equation can take the following forms:
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| - Equação de Yukawa-Tsuno (pt)
- Yukawa–Tsuno equation (en)
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| - The Yukawa–Tsuno equation, first developed in 1959, is a linear free-energy relationship in physical organic chemistry. It is a modified version of the Hammett equation that accounts for enhanced resonance effects in electrophilic reactions of para- and meta-substituted organic compounds. This equation does so by introducing a new term to the original Hammett relation that provides a measure of the extent of resonance stabilization for a reactive structure that builds up charge (positive or negative) in its transition state. The Yukawa–Tsuno equation can take the following forms: (en)
- Estudos de cinética das reações em anel aromático no campo da físico-química orgânica permitiram a elucidação da estrutura do estado de transição e desta forma qual o mecanismo exato que a reação esta seguindo. Com a finalidade de ajustar desvios no comportamento linear da equação de Hammett, e , nos anos 50, estabeleceram a seguinte relação que ficou conhecida como equação de Yukawa-Tsuno: ou No qual, (pt)
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| - The Yukawa–Tsuno equation, first developed in 1959, is a linear free-energy relationship in physical organic chemistry. It is a modified version of the Hammett equation that accounts for enhanced resonance effects in electrophilic reactions of para- and meta-substituted organic compounds. This equation does so by introducing a new term to the original Hammett relation that provides a measure of the extent of resonance stabilization for a reactive structure that builds up charge (positive or negative) in its transition state. The Yukawa–Tsuno equation can take the following forms: where kX and k0 represent the rate constants for an X-substituted and unsubstituted compound, respectively; ρ represents the Hammett reaction constant; σ represents the Hammett substituent constant; σ+ and σ− represent the Hammett substituent constants for reactions in which positive or negative charges are built up at the reactive center, respectively; and r represents the Yukawa–Tsuno parameter. (en)
- Estudos de cinética das reações em anel aromático no campo da físico-química orgânica permitiram a elucidação da estrutura do estado de transição e desta forma qual o mecanismo exato que a reação esta seguindo. Com a finalidade de ajustar desvios no comportamento linear da equação de Hammett, e , nos anos 50, estabeleceram a seguinte relação que ficou conhecida como equação de Yukawa-Tsuno: ou No qual,
* Kx = a constante de ionização após colocar para ou meta substituintes (X)
* K0 = a constante de ionização sem adição de substituintes
* Rho = a constante de reação
* Sigma = a constante do substituinte
* r = parâmetro de ressonância (pt)
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