New Kinetic Evidence for Inversional Mechanism in Thermal Geometrical Isomerization about Carbon-Nitrogen Double Bound

Article abstract of DOI:10.1246/cl.1987.691

Kinetic pressure and solvent effects were studied for geometrical isomerization about carbon-nitrogen double bond in N,N-dimethyl-N'-<(4-nitrophenyl)methylene>-1,4-benzenediamine and 4-<<4-(dimethylamino)phenyl>imino>-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-one.In both of the compounds, the effects clearly demonstrate that the polarity of the reactant decreases slightly during activation, and the results can hardly be reconciled with the previously proposed rotational mechanism.