Selective hydrodechlorination of fluorinated arylamines

Chlorine-containing polyfluorinated anilines and meta-phenylenediamines undergo selective hydrodechlorination easily upon reduction by zinc in aqueous ammonia. A new approach is thus provided to synthetically valuable, partially fluorinated arylamines based on utilizing polyfluorochloroarenes, which are available as intermediates of perfluoroarene production from perchloroarenes. When chlorine atoms are present in positions both ortho and para to the amino group, para chlorine is initially eliminated. Based on this reaction, a one-pot synthesis of partially fluorinated 4-aminopyridines from 3,5-dichlorotrifluoro- and 3-chlorotetrafluoropyridine has been realized.     

Algebraic properties of the tangent cone to a quasimetric space with dilations

Doklady Mathematics -     

Stabilization of the oleic acid-water emulsion with various kraft lignins

The influence of the initial wood species and polymolecular characteristics on the characteristics of the surface of solid-phase lignin was estimated, and the correlation of these parameters with the ability of kraft lignins to stabilize the oleic acid-water emulsion was examined. The kinetics of breakdown of emulsions stabilized with kraft lignin was studied.     

System of piezosensors for prognostication of the storage life of food products

System of sensors operating on the piezoquartz microweighing principle was employed to forecast the storage life of food products based on milk serum. Signals from the sensors are integrated into an output signal forming a recognizable “visual pattern” of an odor.     

Hydrodynamic and surfactant properties of sulfate lignin solutions

The effect of low-molecular-weight electrolyte additions on the behavior of sulfate lignins in aqueous media was studied by capillary viscometry, tensiometry, and dynamic light scattering.     

New chalcones containing carbazole and 3,4-ethylenedioxythiophene fragments

Russian Journal of Organic Chemistry - Acylation of 9-(2-ethylhexyl)carbazole with acetyl bromide in the presence of tin(IV) chloride gave 3-acetyl- and 3,6-diacetyl-9-(2-ethylhexyl)carbazoles...     

On Constructive number fields and computability of solutions of PDEs

In this paper we find a connection between constructive number fields and computable reals. This connection is applied to prove the computability in the rigorous sense of computable analysis) of solutions of some important systems of partial differential equations, by means of algorithms which are really used in numerical analysis.