Quinoxalinium dichromate

In either mechanism, a low value for the KIE is expected for non-linear hydrogen transfer, with non-linear transfer associated with similar enthalpies and diiferent energies of activation for the two isotopomers. The oxidation of benzyl alcohol by quinoxalinium dichromate is acid catalysed, being first order in dichromate, substrate and added / -toluenesulfonic acid, and the KIE for PhCD20H oxidation is 6.78. The latter is the product of a primary effect and a secondary a-deuterium effect if we assume the latter is around 1.2 (see Section 3.3.1), the reaction is a typical acid chromate oxidation with a linear... 

---