Abstract
It was established that in the solutions of N-[arylsulfonylimino(phenyl)methyl]-1,4-benzoquinonemonoimines there are both Z,E-isomerization relative to C=N bonds and atropoisomerism (inhibited rotation around the =N1–C= bond). The latter can be detected when there are the diastereotopic isopropyl groups in the quinoid ring. The rate constants of this process were calculated by the method of analysis of the full line in the 1H NMR spectra. Activation thermodynamic parameters were determined on their basis. With the help of quantum-chemical calculations, we proved that the determined experimental barriers corresponded exactly to the inhibited rotation around the bond =N1–C=.
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