Methyl esters of benzoic and mesitoic acid have been prepared with high yields (>98 wt%) from the corresponding carboxylic acids + methanol in aprotic solvents over samples of H2SO4/SiO2 at 60 C. The results show a high catalytic efficiency of the solids but also suggest an acid strength comparable to that observed in concentrated aqueous H2SO4 (range >90 wt%) when the acid requirements for the esterification of analogous compounds in aqueous acid solutions are taken into account. Indeed, different reacting species, i.e., ArC(OH)+2 from benzoic acid and 2,4,6-triMe-ArC=O+ from mesitoic acid are involved in the esterification, but the mesitoyl cation can be formed and esterified in the acidity ranges between 92 and 98 wt% H2SO4.
|Titolo:||On the acidity of liquid and solid acid catalysts. Part 3. Esterification of benzoic and mesitoic acids|
BIANCHI, CLAUDIA LETIZIA MADDALENA (Ultimo)
|Parole Chiave:||esterification; benzoic acid; mesitoic acid; solid acid catalysts|
|Settore Scientifico Disciplinare:||Settore CHIM/04 - Chimica Industriale|
|Data di pubblicazione:||2000|
|Appare nelle tipologie:||01 - Articolo su periodico|