Journal of the Chemical Society. Perkin transactions II p. 591 - 594 (1983)
Update date:2022-08-03
Topics:
Caproiu, M. Teodor
Elian, Mihai
Grecu, Nicoleta
Negoita, Nicolae
Balaban, Alexandru T.
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.
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