The benzidine rearrangement at high pressure and high temperature

Abstract

The benzidine rearrangement of hydrazobenzene catalyzed by the zeolite of Y-type was studied at the pressure up to 30 kb. The lowest temperature at which the benzidine rearrangement occurred was measured as a function of pressure. The efficiency of the zeolites (NaY and HY) as catalysts on the benzidine rearrangement in the solid state were confirmed. The kinetic information of the intramolecular rearrangement at 210℃ was given. The mean values of the activation volumes of the ortho-and para-rearrangents in the pressure range of 20 to 30 kb are +4.0 and 4.1 cm^3/mole, respectively. The structure of the transition start and the reaction mechanism of the benzidine rearrangement have been discussed.