Influence de la structure des cetones et de l'acidite des phenols sur leur mode de complexation

Steric Effects on the Proton-Transfer Equilibria of Ketones, Sulfoxides, and Phenols

“…Aromatic proton signals were never used, since their chemical shifts undergo other ketones. [24] [25] All the above data point out that the basic carbonyl complicated changes with acidity. [19] All heavy ketones are poorly soluble in water and dilute H 2 SO 4 .…”

“…The latter is known In this paper we report our full results concerning the thermodynamics of protonation of a series of weak bases to undergo a rearrangement reaction in concentrated H 2 SO 4 , [18] which at 80°C becomes too fast to record a 1 H (ketones and sulfoxides), some of which are sterically hindered, as well as NMR studies (for the above ketones and spectrum. Therefore, in this case measurements were carried out at five lower temperatures (25,33,40, 50, 60°C) in orsulfoxides, plus some phenols) related to the dynamics of the methyl groups within the tert-butyl groups which give der to increase the accuracy of thermodynamic data. Raw protonation data (normalized chemical shift vs.% H 2 SO 4 ) rise to the steric hindrance sought.…”