Polyethylene Glycols as Efficient Catalysts for the Oxidation of Bicyclic Monoterpenes by Ceric Ammonium Nitrate in Acetonitrile under Acid‐Free Conditions: Kinetic and Mechanistic Approach

Abstract

Polyethylene glycols (PEG) acts as efficient catalysts for the oxidation of bicyclic monoterpenes such as borneol, isoborneol, and camphor by ceric ammonium nitrate (CAN), a laboratory desktop reagent, in acetonitrile medium under mineral acid-free conditions. The kinetics of the reactions revealed first-order dependence on in both [CAN] and [bicyclic terpene]. The rate of oxidation is accelerated with an increase in [PEG] linearly, which could be explained by considering PEG-bound oxidant (PEG-CAN) as more reactive species than (CAN) itself. The mechanism of oxidation in PEG media has been explained through the participation of PEG-bound oxidant (PEG-CAN) and bicyclic monoterpene in the slow step. C

The Catalytic Influence of Polymers and Surfactants on the Rate Constants of Reaction of Maltose with Cerium (IV) in Acidic Aqueous Medium

“…e reaction followed first-order in both [Ce (IV)] and [alkaloids]. Besides, the rates of reactions were enhanced linearly with an increase in [PEG] [12]. Whilst, Dahadha et al have employed PEG 4000, PVP, and mixed PEG4000-SDS systems as powerful catalysts in the redox reaction of aspirin under acidic reaction conditions.…”

Heptavalent Manganese Triggered Oxidation of Menthol and Camphor in Aqueous Sodium Bisulfate and organized Media using Micelles and Polyethylene Glycols

“…However, nitration occurred in presence of NaNO 2 and KHSO 4 . Noteworthy rate accelerations are recorded in ultrasonically assisted reactions, which were attributed to cavitation effects [5]. During the synthesis of nano-diamond film through non-conventional CVD process, Chakraborty's research group used camphor as precursor [6,7].…”

“…High purity carbon nanotubes (CNTs) were synthesized using camphor as precursor by Kumar and Ando through CVD technique [8]. Above mentioned protocols [5][6][7][8] are largely in accordance with the green-chemistry principles of Paul Anastas and John Warner [9]. These principles suggest to focusing attention on designing and executing eco-friendly reactions using environmentally safe, economically cheap reagents, safer solvents, which will prevent environmental pollutions.…”