Heterocyclic analogs of pleiadiene. 51. N-acylperimidines: Ring opening instead of deacylation under the influence of nucleophiles

N-Acetyl- and N-benzoylperimidines, as well as quaternary salts based on them, were synthesized. It is shown that the heteroring is opened to give N-acyl derivatives of 1,8-naphthalenediamine by the action of nucleophiles on N-acyl-perimidines and N-benzoylperimidine salts.See [1] for Communication 50.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1398–1403, October, 1980.     

Acid-base transformations of quaternary salts of pyridylindoles

It was established that the reaction of alkali with 4-(3-indolyl)pyridinium salts gives stable anhydronium bases, which are readily alkylated at the indole nitrogen atom. The p^K _a values of the anhydro bases were determined by spectrometry. The spectral data and reactivities are compared with the results of calculation by the self-consistent-field (SCF) MO LCAO method.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1477–1481, November, 1978.     

Diffusion of one- and two-electron vacancy centers in polar crystals

The change in the diffusion barrier for anion vacancies in polar crystals is calculated in the case where one electron (F centers) or two electrons (F′ centers) are captured. The lowest singlet and triplet states are considered for the two-electron system. It is shown that the capture of two electrons on the lowest metastable triplet state (which is possible under nonequilibrium conditions, for example, in the case of either exchange scattering of band electrons or thermal refilling of energy levels) leads to a decrease in the diffusion barrier for the system. However, for the two-electron center in the lowest singlet state, the potential barrier to migration, as a rule, is higher than that for a vacancy without electrons. Calculations are carried out for Gaussian functions with the inclusion of the effects of interelectron correlations and electron-phonon interactions.     

Reactions of cyclic ammonium cations

A method for the introduction of a quinoline residue into an aromatic ring by means of 1-acylquinolinium salts was developed. The effect of the anion was examined. A number of quinolylindoles and quinolyltetrahydroquinolines were synthesized by this method. It is shown that electron-acceptor or electron-donor substituents in the benzene ring of the quinolinium salt have practically no effect on the course of the process.See [1] for Communication VI.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1515–1521, November, 1970.