Open AccessOxidation of Cyclohexanol and Cyclohexanone by Monochromate Ions in Organic Solvents and on Solvent Free Microwave Irradiation under Phase Transfer Catalysis - A Comparative Study
Author(s) -
P. Bashpa,
P. Rajendran,
K. Bijudas
Publication year - 2021
Publication title -
asian journal of chemistry/asian journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.145
H-Index - 34
eISSN - 0975-427X
pISSN - 0970-7077
DOI - 10.14233/ajchem.2021.23285
Subject(s) - chemistry , cyclohexanone , cyclohexanol , catalysis , adipic acid , yield (engineering) , inorganic chemistry , phase transfer catalyst , aqueous two phase system , aqueous solution , toluene , mineral acid , extraction (chemistry) , solvent , organic chemistry , photochemistry , materials science , metallurgy
Oxidation of cyclohexanol and cyclohexanone were carried out by acidified monochromate ions inethyl acetate and toluene under phase transfer catalysis and also in solvent free condition undermicrowave irradiation. The extraction of monochromate ions from aqueous medium to organic phasewas carried by employing various phase transfer catalysts in the presence of mineral acids. The effectof [catalyst] and [mineral acid] on extraction of monochromate from aqueous phase to organic phasewas also studied. The product obtained, namely adipic acid obtained with both reactants wascharacterized by its melting point and infrared spectral technique. The reaction was over within 15min with more than 85% yield at a temperature of 323 K under microwave irradiation where as it gavearound 70% yield at 353 K within 150 min under phase transfer catalysis condition. The enhancedreaction rate and high yield of product substantiate the application of phase transfer catalytic techniqueunder microwave irradiation for organic synthesis. A suitable mechanism for the oxidation of substratesby monochromate under phase transfer catalysis is also suggested.