Search for the ternary cluster decay of Cm isotopes using SSNTD

Investigation of the ²⁴⁶Cm spontaneous ternary decay into nearly equal clusters using polyethyleneterephthalate track detectors has been carried out. The possibility of ternary cluster decay has been found out to be of less than 10⁻⁶ with respect to all fission modes of ²⁴⁶Cm.     

Laser-induced spatial structures in a chemically active gas-phase medium illuminated by annular diffracting beams

The laws governing the propagation of diffracting beams in a two-component gaseous mixture are investigated on the basis of a computer simulation. It is discovered that several regions with high concentrations of the reaction product form. It is also found that the beam focus can move both in the direction of beam propagation and in the counter direction, and the change in its position can occur abruptly. It is shown that as time goes on, a high concentration of the reaction product is achieved in the central unilluminated region of the medium near the entrance cross section on account of diffusion (i.e., a diffusional concentration growth occurs). This leads to the formation of a dynamic concentration maximum in this region of the medium. Zh. Tekh. Fiz. 68, 8–14 (March 1998)     

Regioselectivity in the addition of alkanethiols to vinylacetylene in superbasic media of alkali-metal hydroxides in dimethyl sulfoxide

Conclusions The reaction of vinylacetylene with alkanethiols is largely directed toward the formation of alkyl 1,3-butadien-l-yl sulfide with increasing basicity of the system consisting of an alkali-metal hydroxide and DMSO. A reduction in the basicity facilitates the formation of alkyl 2,3-butadien-l-yl sulfide.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2800–2803, December, 1985.     

Addition of xanthate ions to diacetylene

Conclusions S-(1-Buten-3-ynyl) alkylxanthates were obtained by reacting diacetylene with CS₂ in an alcohol-KOH system.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2808–2811, December, 1982.     

Certain asymptotic characteristics of groups

Translated from Matematicheskie Zametki, Vol. 46, No. 6, pp. 85–93, December, 1989.     

1,1,3,3-Tetramethyl-1,3-bis(vinyloxy-methyl)disiloxane

Conclusion 1,1,3,3-Tetramethyl-1,3-bis (vinyloxymethyl)disiloxane has been obtained for the first time from 1,3-bis(hydroxymethyl)tetramethyldisiloxane and butylvinyl ether in the presence of mercury acetate.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 8, pp. 1899–1900, August, 1984.     

Effects of conjugation and the conformational structure of aromatic selenides

Conclusions In the aromatic selenides, in contrast to the corresponding sulfides, the partial steric inhibition of the conjugation of the Se atom with the aromatic -system occurs. The appreciable content (30%) of the plane conformer is observed in compounds with the tertiary and quaternary -carbon atoms of the alkyl group; this explains the weak -donor properties of Se in relation to the aromatic fragment.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 64–69, January, 1989.The authors thank V. M. Bzhezovskii for helpful discussions, as well as V. I. Mamatyuk, R. G. Kostyanovskii, and I. I. Chervin for allowing the possibility of registering the¹³C NMR spectra of some of the investigated compounds.