61 Result(s)

Article

Diazabicycloalkanes with bridgehead nitrogen atoms

Reaction of 4′-iodo- and 4′,5′-diiodobenzo[b]-1,4-diazabicyclo[2.2.2]octenes with o-phenylenediamine under Ullmann condensation conditions gives a mixture of phenazino[1′, 2′-b]- and phenazino[2′, 3′-b]-1,4-di...

A. A. Gall', V. N. Sil'nikov, G. V. Shishkin in Chemistry of Heterocyclic Compounds (1992)

Article

Diazabicycloalkanes with bridgehead nitrogen atoms

By heating 1-(2-hydroxyethyl)benzo[b]-1-azonium-4-azabicyclo-[2.2.2]octene halides in anhydrous solvents or via thermolysis, opening of the bicycle occurs with formation of the corresponding N-(2-hydroxyethyl)...

S. O. Doronina, A. A. Gall', G. V. Shishkin in Chemistry of Heterocyclic Compounds (1992)

Article

Diazabicycloalkanes with nitrogen atoms in bridgehead positions. 25. Influence of 3′-substituents on the direction of hydroxyethylation of benzo[b]-1,4-diazabicyclo[2.2.2]octenes

Substituents in the 3′ and 6′-positions of benzo[b]-1,4-diazabicyclo[2.2.2]octane are capable of influencing the reactivity of the nitrogen atoms in the hydroxyethylation reaction due to steric hindrances or a...

A. A. Gall', A. S. Trachum, G. V. Shishkin in Chemistry of Heterocyclic Compounds (1992)

Article

Diazobicycloalkanes with bridgehead nitrogen atoms in nodal positions. 22. Conformational analysis of benzodiazabicycloalkenes. Iterative evaluation of spectral and thermodynamic parameters

¹H and ¹³C NMR were used to investigate the conformational equilibrium of benzo[f]-1,5-diazabicyclo[3,2.2]nonene and benzo[g]-1,6-diazabicyclo[4.2.2]decene in solution at temperatures from 20 to–110‡C. Benzo[f]-...

G. E. Sal'nikov, A. A. Gall', G. V. Shishkin… in Chemistry of Heterocyclic Compounds (1991)

Article

Some generalizations of Volkov’s problem

Exact solutions of the Dirac equation in the presence of wave fields are considered in this work. In contrast to classical Volkov’s problem (electron in the field of plane electromagnetic wave) wave fields of ...

G. V. Shishkin in Il Nuovo Cimento B (1971-1996) (1991)

Article

Diazabicycloalkanes with nitrogen atoms in bridgehead positions. 24. Synthesis and reactions of benzo[f]-1,5-diazabicyclo[3.2.2]nonen-3-one

Benzo[f]-1,5-diazabicyclo[3.2.2]nonen-3-one was synthesized by the oxidation of benzo[f]-1,5-diazabicydo[3.2.2]nonen-3-ol by dimethyl sulfoxide in the presence of N,N′-dicycohexylcarbodiimide and the reactions...

S. O. Doronina, A. A. Gall', G. V. Shishkin in Chemistry of Heterocyclic Compounds (1991)

Article

Diazabicycloalkanes with bridging nitrogen atoms. 23. Synthesis and properties of benzo[f]-1,5-diazabicyclo[3.2.2]nonen-3-ol

Intramolecular cyclization 1-(2-hydroxyethyl)-2,3,4,5-tetrahydro-1H-1,5-benzodiazepin-3-ol gives benzo[f]-1,5-diazabicyclo[3.2.2]nonen-3-ols. Further treatment with acetic anhydride gives their 3-acetyl deriva...

S. O. Doronina, A. A. Gall', G. V. Shishkin… in Chemistry of Heterocyclic Compounds (1991)

Article

Diazabicycloalkanes with nitrogen atoms in the nodal positions. 21. Heteroatom-promoted lithiation of benzo[b]-1,4-diazabicyclo[2.2.2]octene and introduction of substituents into the annelated benzene ring

The action of n-butyllithium on benzo[b]-1,4-diazabicyclo[2.2.2]octene leads to lithiation in the 3′ position of the aromatic ring. The reaction of this lithium derivative with electrophilic reagents was used ...

A. A. Gall', A. S. Trachum, V. A. Romantsev… in Chemistry of Heterocyclic Compounds (1991)

Article

Emissions and fallout on the site of the I. V. Kurchatov Atomic Energy Institute

V. I. Bavrin, A. E. Borokhovich, A. Sh. Shakhbazov, G. V. Shishkin in Soviet Atomic Energy (1991)

Article

Radiation dose on the perimeter of the I.V. Kurchatov Institute of Atomic Energy

A. E. Borokhovich, G. V. Shishkin in Soviet Atomic Energy (1990)

Article

Diazabicycloalkanes with bridgehead nitrogen atoms. 19. Reactions of monoquaternary salts of dibenzo[b,e]-1,4-diazabicyclo[2.2.2]octadiene with nucleophilic reagents

The monoquaternary salt of dibenzo[b,e]-1,4-diazabicyclo[2.2.2]octadiene reacts with piperidine, 1,3-propylenediamine and sodium p-nitrophenolate with the formation of N,N′-disubstituted dihydrophenazines. In ...

N. P. Lukyanchuk, V. N. Sil'nikov, G. V. Shishkin in Chemistry of Heterocyclic Compounds (1989)

Article

Diazabicycloalkanes with nitrogen atoms in bridgehead positions.

1-Methyl-1-(β-haloethyl)-1,2,3,4-tetrahydroquinoxalinium salts were synthesized and the dependence of the hydrolysis and cyclization rate constants on the acidity of the medium and presence of halide was found...

S. O. Doronina, A. A. Gall', G. V. Shishkin in Chemistry of Heterocyclic Compounds (1989)

Article

Diazabicycloalkanes with nitrogen atoms in bridgehead positions.

The reaction of benzo[1′,2′-b]-1,4-diazabicyclo[2.2.2]octene with chloroformate ester is accompanied by opening of the diazabicyclo fragment and addition of chloroformate ester. A nitro group in the 4′ positio...

A. A. Gall', S. O. Doronina, G. V. Shishkin… in Chemistry of Heterocyclic Compounds (1989)

Article

Synthesis of a 4-aza analog of phencarol and its pharmacological investigation

L. N. Yakhontov, N. N. Kutina, G. V. Shishkin… in Pharmaceutical Chemistry Journal (1989)

Article

Diazabicycloalkanes with nitrogen atoms in bridgehead positions. 16. Synthesis and properties of benzo[b]-1,4-diazabicyclo[2.2.2]octene and dibenzo[b,e]-1,4-diazabicyclo[2.2.2]octadiene, containing primary aromatic amino acids

4′-Aminobenzo[1′,2′-b]-1,4-diazabicyclo[2.2.2]octene and 4′-aminodibenzo[1′,2′-b, e]-1,4-diazabicyclo[2.2.2]octadiene have been prepared by cyclization reactions of N-Β-chloroethyl derivatives of 1,2,4-triamin...

A. A. Gall', V. N. Sil'nikov, G. V. Shishkin in Chemistry of Heterocyclic Compounds (1988)

Article

Comparative catalytic efficiency of 1,4-dialkyl-1,4-diazoniabicyclo[2.2.2]octane difluorides and alkali metal fluorides in the reaction of pentafluorophenol with pentafluoropyridine

The catalytic efficiency of 1,4-dialkyl-1,4-diazoniabicyclo[2.2.2]octane difluorides in the reaction of pentafluorophenol with pentafluoropyridine is somewhat enhanced with increasing length of the alkyl subst...

V. V. Aksenov, V. I. Vysochin… in Bulletin of the Academy of Sciences of the… (1987)

Article

Diazabicycloalkanes with nitrogen atoms in bridgehead positions. 15. Reactions of benzo[b]-1,4-diazabicyclo[2.2.2]octene monoquaternary salt derivatives with nucleophilic reagents

Monoquaternary salt derivatives of benzo[b]-1,4-diazabicyclo[2.2.2]octene react with piperidine and sodium methoxide or 4-tert-butylthiophenoxide to give primarily N,N-disubstituted tetrahydroquinoxalines. Rat...

N. P. Luk'yanchuk, N. I. Sagalaeva, V. K. Soboleva… in Chemistry of Heterocyclic Compounds (1987)

Article

Criteria of separability of the variables in the dirac equation in gravitational fields

I. E. Andrushkevich, G. V. Shishkin in Theoretical and Mathematical Physics (1987)

Article

Diazabicycloalkanes with nitrogen atoms in nodal positions. 14. Synthesis of dibenzo[1′,2′-b,e]-1,4-diazabicyclo[2.2.2]octadienes containing a tertiary amino group in the aromatic ring

The corresponding 2-amino derivatives of phenazinium salts were obtained by the action of dimethylamine and morpholine on N-(2-hydroxyethyl)phenazinium chloride. The subsequent exchange of the hydroxyl group f...

G. V. Shishkin, V. N. Sil'nikov in Chemistry of Heterocyclic Compounds (1986)

Article

Diazabicycloalkanes with nitrogen atoms in nodal positions. 13. Reactions of benzo[b]-1,4-diazabicyclo[2.2.2]octene with electrophiles

The reactions of electrophiles with benzo[b]-1,4-diazabicyclo[2.2.2]octene have been examined. Electrophilic substitution is found to take place in the aromatic ring under severe conditions, in the case of hal...

A. A. Gall', G. V. Shishkin in Chemistry of Heterocyclic Compounds (1986)