International Journal of Science, Engineering and TechnologyAuthors: Dr. Kumari Priyanka
Abstract: The solvent effect of aquo-dipolar protic solvent was highlighted by studying the kinetics of the acid catalysed hydrolysis of Iso-butyl formate in aquo-Methanol reaction media of various compositions having 20 to 80% of methanol at five different temperatures ranging from 20 to 40°C. The sharp depletion followed by slow decrease in the rate, with gradual addition of methanol in the reaction media and also with increasing temperature of the reaction has been explained in the light of solvation and desolvation of initial and transition states to different extents. The changes in the values of iso-composition and iso- dielectric activation energies of the reaction have also been explained in the light of solvation and desolvation of initial and transition states to different extent. Increase in the numerical values of free energy of activation (ΔG*) with simultaneous enhancement in the values of enthalpy of activation (ΔH*) and entropy of activation (ΔS*) of the reaction, reveals that the methanol) acts as enthalpy dominating solvent. From the evaluated value of iso-kinetic temperature which comes to he 325.0, it is inferred that there is strong solvent-solute interaction in aquo-methanol reaction media. Effects of ionic strength and change in [H+] ion concentration on the rate of reaction have also been studied and it is concluded that the acid catalysed hydrolysis of Iso-butyl formate is ton-dipolar reaction and it follows AAC2 mechanistic pathways in aquo-MeOH reaction media.
DOI: http://doi.org/10.5281/zenodo.18241286
