87327-18-2Relevant academic research and scientific papers
Factors affecting the Stability and Equilibria of Free Radicals. Part 11. 1-Benzoyl-2,2-bis-(3,5-di-t-butylphenyl)hydrazyl and its Temperature-dependent Electron Spin Resonance Spectrum
Caproiu, M. Teodor,Elian, Mihai,Grecu, Nicoleta,Negoita, Nicolae,Balaban, Alexandru T.
, p. 591 - 594 (1983)
The title free radical was prepared by oxidizing the corresponding hydrazine with lead tetra-acetate in benzene or toluene.Its e.s.r. spectrum undergoes reversible changes in the temperature range -90 to +60 deg C.Simulated e.s.r. spectra indicate that the two di-t-butylphenyl groups are non-equivalent owing to restricted rotation around the N-N bond at low temperatures, but at 60 deg C these two aryl groups become equivalent.The ΔG(activ.) value of the rotation barrier is about 31 kJ mol-1 in the temperature range - 30 to + 50 deg C.
