THE REVERSIBLE-REACTION OF N,N'-DIPHENYL-1,4-BENZOQUINONE DIIMINE WITH 4-HYDROXYDIPHENYLAMINE - KINETIC REGULARITIES, A SIMPLE-MODEL, AND N,N'-DIPHENYL-1,4-PHENYLENEDIAMINE AS A PRODUCT AND CATALYST OF THE REACTION

The kinetics of the reversible reaction of N,N'-diphenyl-1,4-benzoquin one diimine (QDI) with 4-hydroxydiphenylamine (HDPA) is studied in chl orobenzene. The effective rate constant for the second-order reaction between QDI and HDPA decreases with the development of the process and increases as HDPA concentration grows. N,N'-Diphenyl-1,4-phenylenedia mine (DPPDA), which is one of the products of the reaction between QDI and HDPA may decrease or increase its rate, depending on the conditio ns. A simple mechanism is suggested, which takes into account syn-anti isomerization of QDI and the different activity of the isomers in sim ilar reactions, the formation of quinhydrone complexes in the reaction , and the participation of these complexes in the overall process. Thi s mechanism is used for the solution of reverse kinetic problems.