This investigation’s goal is to use kinetic techniques to examine the catalytic effects of transition metal ions on the oxidation of a number of perfumery and aroma alcohols by Ce (IV) in an acidic medium.

There are few reports of the kinetic and thermodynamic investigations of the oxidation of alcohols in the literature compared to the quantitative features of the conversion of alcohols to aldehydes and ketone.

Alcohol oxidation has frequently been catalysed by the metal ions Cr (VI), Os (VIII), and Ru, which are all toxic to the environment.

With Ce(IV) acting as the oxidant in an acidic media, we looked at how perfumery and scent alcohols oxidise.
In an effort to reduce environmental impact, primary acyclic alcohols Geraniol, Nerol, and Citronellol, secondary cyclic alcohols Borneol and Isoborneol, and primary unsaturated alcohol Cinnamyl alcohol have all been successfully catalysed by the use of less harmful and expensive transition metal ions.

The oxidation rates of alcohols with respect to the inorganic oxidant were calculated using kinetic techniques under first order kinetic circumstances.

The oxidation rate for each alcohol rose with [alc.] but fell with Ce(IV) concentration.

The energy of activation and thermodynamic activation parameters were assessed from the fluctuation of oxidation rate with temperature and interpreted in terms of the molecular dynamics of the oxidation process.

For each perfumery alcohol, the sequence of the transition metal ions’ catalytic efficiency was measured, and it was compared to the anticipated sequence predicted based on the stability order of the metal complexes generated as unstable intermediates during the oxidation reaction. With a transition metal’s concentration, alcohol oxidation rates rise. The oxidation of aromatic alcohols has been studied both with and without the use of transition metal ion catalysts, and suitable reaction pathways have been proposed.

Author(s) Details:

Damodar V. Prabhu,
Department of Chemistry, Wilson College (Autonomous), Affiliated to University of Mumbai 400007, India.

Harichandra A. Parbat,
Department of Chemistry, Wilson College (Autonomous), Affiliated to University of Mumbai 400007, India.

Chetana N. Rana,
Department of Chemistry, Wilson College (Autonomous), Affiliated to University of Mumbai 400007, India.

Himanshu Gupta,
Department of Chemistry, Wilson College (Autonomous), Affiliated to University of Mumbai 400007, India.

Please see the link here: https://stm.bookpi.org/CTCB-V4/article/view/7806  

Keywords: Perfumery alcohols, inorganic oxidant, kinetics, transition metal ion catalysts, catalytic efficiency, Irwing-William’s stability order of metal complexes, reaction mechanism, thermodynamic activation parameters