Dissociation constants of HL + acids, where L stands for 1-alkylimidazole, 1-alkyl-2-methylimidazole, 1-alkyl-2-ethylimidazole, 1-alkyl-2-propylimidazole, 1-alkyl-4-methylimidazole and 1-alkyl-2-ethyl-4methylimidazole, were determined potentiometrically. For each of the homologous series of these ba
Influence of inductive effects and polarizability on the acid-base properties of alkyl compounds. Inversion of the alcohol acidity scale
✍ Scribed by J. Catalán
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 545 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0894-3230
No coin nor oath required. For personal study only.
✦ Synopsis
The inductive effects and polarizability of a series of 17 alkyl substituents were evaluated in theoretical terms from ab initio calculations for acid-base processes involving the corresponding alkanols. The effects allow one to account for general acid-base processes, both in the gas phase and in solution. Also, the classical inductive effect accounts for the acidity of dissolved alkanols and hence provides a straightforward explanation for the well known acidity inversion in alkanols from the gas phase to a solution. The applicability of the derived Z and P values for the alkyl groups to the protonation of amines, nitriles, ethers and thiols is shown.
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