Mixed anionic-nonionic micelle catalysed oxidation of aliphatic alcohol in aqueous medium

• Published in: Journal of molecular liquids Vol. 303; p. 112655
• Main Authors: Acharjee, Animesh, Rakshit, Atanu, Chowdhury, Suman, Ali, Md. Ansar, Singh, Bula, Saha, Bidyut
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-04-2020
• Subjects: Active oxidant (AO+); Catalysed; Mixed micelle; Promoter; Rate constant; Surfactant; UV; SDS; Catalysed; Phen; kobs; Mixed micelle; IR; Bpy; TX 100; Surfactant; AO; Promoter; PA; NMR; Active oxidant (AO+); CMC; TMS; Rate constant; 2, 4-DNP
• ISSN: 0167-7322; 1873-3166
• DOI: 10.1016/j.molliq.2020.112655

Oxidation of isoamyl alcohol was carried out under pseudo 1st order reaction condition in aqueous medium by chromic acid. In addition to single micelle, mixed anionic-nonionic micelle (SDS-TX 100) was found to be effective catalyst. Promoters in presence of micelle catalyst showed almost million fold rate acceleration. The product was confirmed by IR and NMR study. UV and NMR analysis were carried out to establish the formation of mixed micelle. Formation of active oxidant was confirmed by fluorescence measurement. Interactions between surfactant and substrate were analysed by NMR spectra. In addition to SDS catalysed Bpy promoted reaction combination of mixed micelle with Bpy promoter was found to show higher rate of oxidation. For single micelle catalysed path the observed rate constants follow the order kobs (SDS) > kobs (TX 100) and kobs (Phen) > kobs (Bpy) > kobs (PA) was observed for promoted reactions. In SDS micelle and mixed micelle kobs (Bpy) > kobs (Phen) > kobs (PA) was observed while in TX 100 micelle kobs (Phen) > kobs (Bpy) > kobs (PA) was found.
[Display omitted]
•Greener efficient method of oxidation of isoamyl alcohol•SDS catalysed reactions are faster than TX 100 catalysed reactions.•Mixed micelle (SDS + TX 100) found to be efficient catalyst.•Rate constants in promoted path follow the order, kobs (Phen) > kobs (Bpy) > kobs (PA).•SDS catalysed and Bpy promoted reaction showed million folds rate acceleration.