Aqueous ferric chloride as a model for peroxidase in the catalysed autoxidation of indole-3-acetic acid

✍ Scribed by J.F. Harrod; C. Guérin

• Book ID: 104138192
• Publisher: Elsevier Science
• Year: 1979
• Tongue: English
• Weight: 333 KB
• Volume: 37
• Category: Article
• ISSN: 0020-1693
• DOI: 10.1016/s0020-1693(00)95535-x

✦ Synopsis

Contrary to previous claims it is found that aqueous FeCIJ is at best a rather feeble catalyst for air oxidation of indole-3-acetic acid (MA). Although Fe(M) does appear to undergo direct one-electron reduction by IAA under anaerobic conditions, the rate of the reaction is slow and comparable to the rate at which 0, reacts with IAA. Ceric ion reacts very rapidly with IAA to produce Imethyleneoxindole in the presence of air and an uncharacterised red, polymeric product in the absence of air. Production of the red polymer consumes two equivalents of either Fe(III) or Ce(IV) per IAA reacted. It is concluded that these systems are not good models for the peroxidase catalysed oxidation of IAA.