A novel three-component reaction of 1, 1-dicyano-2-(trifluoromethyl)ethylenes,primary arylamines,and ketones

1, 1-Dicyano-2, 2-bis(trifluoromethyl)ethylene and 3, 3-dicyano-2-(trifluoromethyl)acrylates react with primary arylamines in the presence of ketones to form 1, 1-aryl-1, 4-dihydropyridme derivatives under mild conditions. The mechanism of this three-component reaction includes the formation of Schiffs bases as intermediates. 1, 4-Dihydropyridine derivatives, which are the products of three-component heterocyclization, were also obtained by reaction the corresponding Schiffs bases with 1, 1-dicyano-2-(trifluoromethyl)ethylenes.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 552–559, March, 1993.For preliminary communication see Ref. 1.     

2-Trifluoromethyl-4-butanolides

Specific features were elucidated for the intramolecular cyclization of 2-trifluoromethyl-4-pentenoic acids (Ia)-(Ic) under acid catalysis and upon bromination and epoxidation of the double bond. Feasibility was demonstrated for the lactonization of acids (Ia)-(Ic) upon the trifluoroacetoxylation of the double bond and some properties of the butanolide products were studied.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 516–521, February, 1991.     

Reactions of α-halonitrosoalkanes with resorcinol

-Halonitrosoalkanes react with resorcinol as nitrosylating agents to form 3-hydroxy-N-(2,4-dihydroxyphenyl)-1,4-quinone imine.Translated fromIzvestiya Akademioi Nauk. Seriya Khimicheskaya, No. 3, pp.773–774, March, 1996.     

Electric birefringence of solutions of aromatic poly(amide hydrazide) in dimethyl sulphoxide

Birefringence in a pulsed electric field has been investigated for solutions of para-aromatic polyamid hydrazide (PAH) in dimethyl sulphoxide. The values of the specific Kerr constant K extrapolated to zero concentration have been determined. The experimental data are adequately described by the theoretical dependence of K on the contour length of the PAH molecules for kinetically rigid wormlike chains. The angle formed by the dipole moment of the monomer unit and the direction of the PAH chain was found to be 61.5 ± 1.5°. Comparison between relaxation times obtained from the curves of the decay of birefringence after the end of the electric pulse and the intrinsic viscosities of some PAH samples confirm the conclusion about high kinetic rigidity of PAH macromolecules.     

Pinacone reduction of methyl trifluoropyruvate

Methyl trifluoropyruvate (1) enters into reductive dimerization during UV irradiation in the presence of isopropyl alcohol or of a sensitizer and during reaction with sodium in the presence of trimethyldichlorosilane, giving dimethyl 2,3-bis(trifluoromethyl)-2,3-dihydroxysuccinate. Unlike hexafluoroacetone, compound 1 does not form the reductive dimerization product after prolonged standing over sodium but is converted into the cyclic dimer 2-methoxycarbonyl-4-methoxy-2,4-bis(trifluoromethyl)-1,3-dioxolan-5-one.A. N. Nesmeyanov Institute of Heteroorganic Compounds, Russian Academy of Sciences, 117813 Moscow. Translated fromIzvestiya Akademii Nauk, Seriya Khimicheskaya, No. 6, pp. 1408–1411, June, 1992.     

Collective Effects in the NICA Collider

Physics of Particles and Nuclei Letters - Collective effects in the NICA collider are considered taking into account the results of calculations of induced electromagnetic fields (wakes) and...     

Physical characteristics of a heavy hydrogen ion source based on a coaxial discharge system with central filament anode

Results are presented from a study of physical characteristics of a heavy hydrogen isotope ion source using a gas filled accelerator tube for neutron generation based on a coaxial system with central filament anode. High and low current operating modes of such a source are considered, together with factors affecting its operation. Mass-spectrometer and current-voltage characteristics of orbitron ion sources are considered. The advantages and shortcomings of such sources compared to Penning sources are discussed.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 13–17, September, 1990.