Alkylation of π-donating compounds by methoxyallene-arylsulphenyl chloride adducts

Reaction of methoxyallene with arylsulphenyl chlorides proceeds nonselectively with formation of mixtures of 1,2- and 2,3-arylthiochloro adducts, the composition of which depends on the nature of the reagent and solvent. -Donating compounds of various types in the presence of Lewis acids are alkylated by adducts of methoxyallene with arylsulphenyl chlorides and primarily products are formed by attack at the C³ atom of the reagent.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 114–121, January, 1990.     

Alkylation of π-donors by (E)-1-methoxybutadiene adducts with arylsulfenyl chlorides

Conclusions 1,4-Adducts of 1-alkoxybutadiene with arylsulfenyl chlorides were obtained. It was shown that these adducts can be used as C-electrophiles to transfer 1-alkoxy-4-arylthiobuten-2-al groups in reactions with -donors.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1608–1612, July, 1989.     

Alkylation of methoxyallene by α-alkoxy-β-(arylthio)alkyl chlorides

Conclusions In the presence of Lewis acids, methoxyallene is alkylated by -alkoxy--(arylthio)alkyl chlorides, giving exclusively 1,2-addition products of a C electrophile and a nucleophile (OH, OMe, or H).Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2792–2796, December, 1988.     

Influence of the composition of a plasma-forming gas on nitriding in a non-self-maintained glow discharge with a large hollow cathode

The article presents the results of an investigation into the influence of the composition of a plasma-forming gas (N₂, Ar, He) on nitriding of VT1-0 grade titanium (0.25%-Fe; 0.1%-Si; 0.2%-O) and commercial 40X steel (0.4%-C; 1.0%-Cr) in the plasma of a non-self-maintained glow discharge with a large hollow cathode. It is shown that the efficiency of nitriding of 40X steel weakly depends on the composition of the plasma-forming gas mixture, whereas nitriding of VT1-0 titanium in a helium-nitrogen mixture leads to a noticeable increase in the microhardness of the specimen’s surface in comparison with nitriding in an argon-nitrogen gas mixture.     

Study of gas-mixture composition influence on structure and properties of titanium alloy VT6 at low-temperature nitriding

The influence of gas-mixture composition on structure and properties of titanium alloy VT6 (Ti-6Al-4V) at low-temperature nitriding in plasma of non-selfsustained low-pressure arc discharge is studied. The material was in two states: coarse-grained and submicrocrystalline. It is shown that mechanical properties and thickness of the modified layer depend on preliminary formed structure.