Synthesis and transformations of 1,1,1-trifluoro-2-benzylthiopropene

Conclusions 1,1,1-Trifluoro-2-benzylthiopropene was synthesized and the reactions of this sulfide with electrophiles and nucleophiles (H₂SO₂, SO₂C₁₂ and NHEt₂) leading 1,1,1-trifluoroacetone, 1,1,1-trifluoro-2,3-dichloro-2-benzylthiopropane and 1-trifluoromethy1-2-(N,N-diethylamino)-ethyl benzyl sulfide, respectively, were studied.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 209–211, January, 1987.     

Study of basic properties of tert-butyl-substituted tribenzo(1,2,5-thiadiazolo)porphyrazines

Basic properties of tri(4-tert-butylbenzo)[b,g,l](1,2,5-thiadiazolo)[3,4-q]porphyrazine and its Cu complex in the H₂SO₄-CH₃COOH medium were studied by means of spectrophotometric titration. It was found that in going from an acetic acid solution 100% H₂SO₄ the complete acid-base interaction consecutively involves all the four meso-nitrogen atoms of the porphyrazine macroring, as well as one of the nitrogen atoms of the 1,2,5-thiadiazol fragment. The stability constants of the resulting acid forms were determined and compared with the gas-phase proton affinities calculated by the AM1 method. Annulation of a 1,2,5-thiadiazole fragment to the porphyrazine macroring increases the basicity of the 1,2,5-thiadiazole nitrogen atoms and decreases the basicity of macroring meso-nitrogen atoms.     

Effect of structural states in near-surface layers of commercial titanium on its fatigue life and fatigue fracture mechanisms

Changes of structural states in near-surface layers of α-titanium strongly affect its fatigue life and fatigue fracture mechanisms. In α-titanium subjected to alternate bending a sliding mode crack develops, resulting in slight delamination of the material. Hydrogenation of α-titanium surface layers preserves their sliding mode cracking but greatly enhances their delamination. Nanostructuring of α-titanium surface layers increases their nanohardness and elastic modulus and causes opening mode cracking. The fatigue life of the material after surface hydrogenation decreases three times, and after surface nanostructuring, it increases four times.     

Addition of nucleophilic reagents to bis(trifluoromethyl) ketene

Conclusions When -hydrohexafluorothiolisobutyric acid is reacted with bis (trifluoromethyl) ketene, the initial act is addition bo the C=O multiple bond of the latter.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2408–2410, October, 1982.     

α,β-unsaturated fluorine-containing thiocyanates

A new method has been developed for the synthesis of perfluorinated,-unsaturated thiocyanates by the reaction of the corresponding sulfenyl chlorides with KCN in water. The thiocyanate form of perfluoro-2-methyl-2-pentene-3-thiocyanate was isomerized to the isothiocyanate form. This rearrangement is initiated by both fluoride and thiocyanate anions.For previous communication, see [1].Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2862–2865, December, 1990.