Abstract
The UV, PMR, and ESR spectra as well as the magnetic susceptibilities of 1- and 2- substituted perimidine, aceperimidine, and a number of compounds related to them were measured and discussed. The results obtained indicate that the distribution of the π-electron density in the perimidine system is very nonuniform, which is in agreement with quantum-mechanical calculations. This is particularly manifested in the depressed diamagnetism of perimidines, the presence of an ESR signal for them, and in the shift of the chemical shifts of the protons to high field. Owing to the high-lying upper occupied molecular orbital, the perimidines are extremely strong π donors and readily form charge-transfer complexes.
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See [1] for communication V.
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 543–552, April, 1971.
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Pozharskii, A.F., Kashparov, I.S., Holls, P.J. et al. Heterocyclic pleiadiene analogs. Chem Heterocycl Compd 7, 507–515 (1971). https://doi.org/10.1007/BF00471496
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DOI: https://doi.org/10.1007/BF00471496