B. I. Buzykin, V. D. Cherepinskii-Malov, I. Litvinov
Jun 1, 1982
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Journal
Bulletin of the Academy of Sciences of the USSR, Division of chemical science
Abstract
Conclusions1.It has been established by X-ray structural analysis that the highly polar form of 1-(4-nitrophenyl)-3,5,5-triphenylformazan has the structure of the E1,2, E2,3, E3,3-isomer.2.The specificity of the electronic and spatial structure of this isomer (acceptor NO2 and donor PhN group linked by a fairly planar system of conjugation) permits its high dipole moment to be explained by intramolecular charge transfer.3.Conjugation plays a fundamental role in the determination of the conformation of sterically hindered hydrazones.4.The conformation of the diphenylamino group in compounds of various classes is due both to intramolecular factors and to the nature of the packing in the crystal.