Über Pyridinium-N-phenol-betaine und ihre Verwendung zur Charakterisierung der Polarität von Lösungsmitteln

One of the important reasons why chemists study rates of chemical reactions is a practical one. They want to determine the rate at which a reaction mixture approaches the state of its equilibrium, yielding a certain reaction product. This rate can be enhanced by changing the concentration of reactants and the pressure, by temperature increase, or by various catalysts. A more sophisticated reason, which is presently of our primary interest, is the study of reaction mechanisms, that is, the determination of those elementary reaction steps which finally lead to the reaction product.

Chemical Kinetics and Reaction Mechanisms

Do general nucleophilicity scales exist

YX Scales of Solvent Ionizing Power

Publisher Summary Solvolytic reactions frequently are used to derive structure/reactivity relationships and the results are implicitly assumed to be independent of the solvent The solvent acts as a kinetically significant nucleophile in the overall solvolysis process for many simple secondary substrates, and this appears to be the major cause of the variation in relative rates with changes in solvent For solvolytic reactions that proceed via carbocations or ion pairs, it is of interest to compare the solvent effects with those obtained in strongly acidic media such as “magic acid” and in the gas phase Despite minor mechanistic differences, it is clear that solvation of charged intermediates must greatly reduce the energies of solvolytic reactions compared with the corresponding gas phase reaction As solvolytic reactions involve the nucleophilic “push” and electrophilic “pull,” it is possible to derive quantitative empirical measures of the role of solvent molecules as ionizing medium, electrophile and nucleophile By comparing the sensitivity of various reactions to solvent polarity or “ionizing power” and nucleophilicity, it is possible to deduce mechanistic information, which can supplement other evidence for reaction mechanisms The addition of salts can affect both the rate and the course of solvolytic reactions and provides very important evidence for ion-pair intermediates The SN1 and SN2(intermediate) mechanism of solvolytic reactions, mechanisms of solvolysis of secondary substrates, and correlation of solvolysis rates are described in the chapter

Medium Effects on the Rates and Mechanisms of Solvolytic Reactions

Correlation of Solvolysis Rates. VIII. Benzhydryl Chloride and Bromide. Comparison of mY and Swain's Correlations1

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Correlation of Solvolysis Rates. VIII. Benzhydryl Chloride and Bromide. Comparison of mY and Swain's Correlations1