Ahmad, Ejaz published the artcileUnderstanding reaction kinetics, deprotonation and solvation of bronsted acidic protons in heteropolyacid catalyzed synthesis of biorenewable alkyl levulinates, Safety of Ethyl 4-oxopentanoate, the main research area is levulinic acid heteropolyacid catalyst esterification kinetics IR spectra.
In search of a ‘descriptor’ for Bronsted acid-catalyzed biorenewable transformations in a complex reaction environment, two concepts related to the reactivity of Bronsted acid catalysts are explored. A simple reaction involving the esterification of levulinic acid in three different alc. mediums (ethanol, 1-propanol, and 1-butanol) is experimented with two different Keggin heteropolyacid (HPA) catalysts to synthesize alkyl levulinates. On the same HPA catalyst, and different solvent medium, apparent activation energies of the esterification reaction are observed to increase by an average of â? kJ/mol on increasing the alkyl chain length of the alc. medium by one carbon. Obtained apparent activation energies are corresponding with the solvation energies of the Bronsted proton in the resp. alc. medium. In contrast, on changing the HPA catalyst and keeping the same alc. medium, the apparent activation energies are observed to differ by an average of â?9 kJ/mol. This directly correlates with the difference (â?0 kJ/mol) in the vapor phase deprotonation energies (DPE) of the two HPA catalysts. Thus, in the solvent environment, DPE values and the degree of solvation of the Bronsted acidic protons are describing the reactivity of the HPA catalysts.
Chemical Engineering Journal (Amsterdam, Netherlands) published new progress about Activation energy. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Safety of Ethyl 4-oxopentanoate.
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics