Oxidizing Properties of the tert-Butyl Hydroperoxide-tetra-ter/-Butoxychromium System

摘要

tert-Butyl hydroperoxide reacts with the tetra-tert-butoxychromium by oxidizing the latter to chromyl Cr~V=0 (C6H6, 20°C). At t-BuOOH-Cr(OBu-04 ratio of 2 : 1 or higher, oxygen is released. The occur-ing processes include the formation of chromium-containing peroxides and peroxytrioxydes. The t-BuOOH— Cr(OBu-t)4 system oxidizes aromatic hydrocarbons of various structures (anthracene, 9,10-dimethylanthracene, 1,1-diphenylethylene, alkylarenes), as well as primary and secondary alcohols. Depending on the structure of the substrate, the oxidants are: in situ generated oxygen including that in the singlet state, peroxy radicals, or chromium-containing peroxides.