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Protic and aprotic solvent effects on the reactivity of picolinic, nicotinic  and isonicotinic acid, as well as of some substituted nicotinic acids with  diazodiphenylmethane (DDM) were investigated. In order to explain the kinetic  results through solvent effects, the second-order rate constants for the  reaction of the examined acids with DDM were correlated using the Kamlet-Taft  solvatochromic equation. The correlations of the kinetic data were carried  out by means of the multiple linear regression analysis and the solvent  effects on the reaction rates were analyzed in terms of the contributions of  the initial and the transition state. The signs of the equation coefficients  support the already known reaction mechanism. The solvatation models for all  the investigated acids are suggested and related to their specific structure

journal of the serbian chemical society

The comparative study of linear solvatation energy relationship for the reactivity of pyridine carboxylic acids with diazodiphenylmethane in protic and aprotic solvents