Kinetics and mechanism of oxidation of some heterocyclic aldehydes by benzimidazolium fluorochromate in aqueous acetic acid medium

Department of Chemistry, C. Abdul Hakeem College (Autonomous), Melvisharam-632 509, Tamilnadu, India
E-mail : smansoors2000@yahoo.co.in
Department of Chemistry, Periyar Government Arts College, Cuddalore-607 001, Tamilnadu, India
Department of Chemistry, Thiruvalluvar University, Serkadu, Vellore-632 106, Tamilnadu, India
Manuscript received online 19 November 2014, accepted 11 June 2016

The oxidation of some heterocyclic aldehydes (HA) like 2-furaldehyde, 2-pyrrole-carbaldehyde and 2-thiophene­carbaldehyde by benzimidazolium fluorochromate (BIFC) have been studied in aqueous acetic acid medium. The oxidation leads to the formation of the corresponding carboxylic acids. The reaction is first order with respect to BIFC, heterocyclic aldehydes and [H⁺] and the reaction is catalyzed by hydrogen ions. The reaction has been studied in different percentage of acetic acid-water mixture. A suitable mechanism has been proposed.