THE OXIDATION OF DL - ALANINE BY QDC IN PARTIAL NON - AQUEOUS MEDIUM ? A KINETIC AND MECHANISTIC STUDY

The present paper describe the kinetics of oxidation of Dl - alanine by QDC in the presence of perchloric acid in 30% DMF - H 2 O(v/v) medium at 40 ? C spectrophotometrically at λ max = 354nm. The reaction is first order with respect to [QDC], [H + ], and [substrate]. The reaction rate increased with increasing volume percentage of DMF in reaction mixture, suggesting the involvement of an ion and neutral molecule in the rate determining step. Michaelis - Menten type kinetic was observed with Dl - alanine. The reaction rates were studie d at different temperature and the activation parameters has been computed. The main product were identified as Cr (III) and acetaldehyde.