Abstract
The kinetics of hydrogen peroxide oxidation of catechol (CAT) and 3,5-di-tert-butylcatechol (DTBC) using neat as well as zeolite encapsulated copper complexes of o-phenylenediamine as catalysts have been investigated by a novel UV-visible spectrophotometric technique. The order with respect to the substrate, hydrogen peroxide, as well as the catalyst was unity for all the reactions. This indicates that the mechanism of the reaction is unaltered by encapsulation of the complex although considerable difference exists in the rate of catalysis. The effects of polarity and pH on the reaction were found to be different for the four reactions, suggesting the existence of a deprotonation equilibria for the catalysts in addition to those for the substrates. The rate of oxidation of DTBC was more than that of catechol in the presence of both the catalysts signifying that the inductive effect dominates over the steric constraints in this case. The present work allowed the determination of the acid dissociation constants of Cu(OPD)2 and YCu(OPD)2 in 1 : 9 methanol–water mixtures.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
