Cyclization of azines with bifunctional nucleophiles — a one-step route to condensed heterocycles (review)

Nucleophilic diaddition and disubstitution in the azine. series with the participation of bifunctional reagents, the result of which is the formation of condensed heterocycles, were examined.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1011–1026, August, 1985.     

The chain of right simple semigroups in ordered semigroups

The relation ≤ is defined on the set of right ideals of an ordered semigroup. The main result of this paper is as follows: an ordered semigroup S is a chain of right simple ordered semigroups if and only if ≤ is an order relation. Bibliography: 3 titles. Published inZapiski Nauchnykh Seminarov POMI, Vol. 227, 1995, pp. 83–88.     

On Homomorphisms from Semigroups onto Cyclic Groups

   Communicated by     

Enhancement of the absorption capacity of soot by the action of direct-current corona electric field on hydrocarbon flame

It was shown that the action of the electric field of direct-current corona discharge on hydrocarbon flame leads to an increase in the specific surface area and enhancement of the absorption capacity of soot clusters with an increase in the electric field strength and temperature.     

Reactions of azinium cations. 7. 13C NMR spectra and electron structure of neutral σ-adducts of 1,4-diazinium cations and methylate anion

The ¹³C NMR spectra have been recorded of a number of -adducts formed by pyrazinium, quinoxalinium, and pteridinium cations with methylate anion. The experimental data were compared with CNDO/2 calculations of adduct electron structure.For Communication 6, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1385–1391, October, 1987.