Pyrroles from ketoximes and acetylene. 30. The synthesis of 3-alkyl-2-arylpyrroles

Conditions were found for the synthesis of 3-alkyl-2-arylpyrroles using the Trofimov reaction at 50–70 °C both at elevated and atmospheric pressure. O-Vinyloximes and 3H-5-hydroxy-4,5-dihydropyrroles were isolated as intermediates.Communication 29, see ref. [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1501–1505, November, 1985.     

Stress state of hollow orthotropic noncircular cylinders under a local load

S. P. Timoshenko Mechanics Institute, National Academy of Sciences of the Ukraine, Kiev. Technical Center, National Academy of Sciences of the Ukraine, Kiev. Translated from Prikladnaya Mekhanika, Vol. 31, No. 5, pp. 3–11, May, 1995.     

Thermally stressed state of solids of revolution with finite dimensions

The solution of the axisymmetric elasticity problem for an unparted hyperboloid of revolution is used to obtain the exact analytical solution of the reference problem of the thermally stressed state of an isotropic solid of revolution with finite dimensions and a transverse cross section of complex configuration.Kiev. Moscow. Translated from Teoreticheskaya i Prikladnaya Mekhanika, No. 21, pp. 3–9, 1990.     

Solvent extraction of noble metals with derivatives of thiourea

Studies on the use of diphenylthiourea, hexamethylene-N'-phenylthiourea, N,N-hexa-methylene-N'-isohexylthiourea and di-tert-butylthiourea for the extraction and group concentration of noble metals are reported. A preliminary treatment of solutions of the platinum metals with tin(II) chloride is useful in accelerating the reactions. The chemistry of the extraction and the properties of the extracted compounds are discussed. Hexamethylene-N'-phenylthiourea provides the best selectivity in the presence of copper, whereas the isohexylthiourea derivative provides the greatest solubility.