caa a22 4500 465775691 CHVBK 20180323111941.0 cr unu---uuuuu 170327e19900601xx s 000 0 eng 10.1007/BF01038373 doi (NATIONALLICENCE)springer-10.1007/BF01038373 Kinetics and mechanism of oxidation of DL-leucine by acid permanganate [Elektronische Daten] [M. Hussain, Firoz Ahmad] Summary: The kinetics of oxidation of leucine (LCO2H) by acid permanganate have been followed spectrophotometrically at 525 nm for the disappearance of MnVII and at 420 nm for the appearance of MnIV. The latter absorbance passes through a maximum, signifying the presence of a consecutive reaction involving a MnIV intermediate. The reaction is first order with respect to [MnO 4 − ]. The rate constant, k7, has been evaluated at different [LCO2H], [H+] and temperatures, from plots of A corr 525 versus time. The overall rate expression satisfying the observed kinetic parameters is $$\begin{gathered} - \frac{1}{{[Mn^{VII} ]_{tot.} }}\frac{{d[Mn^{VII} ]_{tot.} }}{{dt}} \hfill \\ = {{\{ k\prime _1 [LCO_2 H]_0^{1/2} + k\prime _2 [LCO_2 H]_0^{2} \} } \mathord{\left/ {\vphantom {{\{ k\prime _1 [LCO_2 H]_0^{1/2} + k\prime _2 [LCO_2 H]_0^{2} \} } {[H^ + ]}}} \right. \kern-\nulldelimiterspace} {[H^ + ]}} \hfill \\ \end{gathered} $$ It is found that 8 moles of CO2 are produced and 8 moles of leucine are consumed per mole of permanganate consumed. The decarboxylation involves a cyclic chain reaction. Chapman and Hall Ltd., 1990 Hussain M. Department of Chemistry, Aligarh Muslim University, 202 002, Aligarh, India aut Ahmad Firoz Department of Chemistry, Aligarh Muslim University, 202 002, Aligarh, India aut Transition Metal Chemistry Kluwer Academic Publishers 15/3(1990-06-01), 185-190 0340-4285 15:3<185 1990 15 11243 https://doi.org/10.1007/BF01038373 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01038373 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hussain M. Department of Chemistry, Aligarh Muslim University, 202 002, Aligarh, India aut NATIONALLICENCE 700 1- Ahmad Firoz Department of Chemistry, Aligarh Muslim University, 202 002, Aligarh, India aut NATIONALLICENCE 773 0- Transition Metal Chemistry Kluwer Academic Publishers 15/3(1990-06-01), 185-190 0340-4285 15:3<185 1990 15 11243 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer