Thin-layer chromatography of steroids on microplates with fixed silica gel

Summary 1. A method for chromatographing steroids on microplates with silica gel of types KSK and KSM has been developed.2. The possibility of using a solution of iodine in potassium iodide to detect steroid compounds has been demonstrated and the sensitivity of this reaction has been determined.Khimiya Prirodnykh Soedinenii, Vol. 2, No. 5, pp. 321–325, 1966     

Composition and structure of complexes formed in the reaction of uranyl di(2-ethylhexyl)phosphate and tributyl phosphate or di-N-octyl sulfoxide in benzene solutions

This paper reprots of³¹P NMR and IR studies of the interaction of tributyl phosphate (TBP) and di-n-octyl sulfoxide (DOSO) with polymer molecules of uranyl di-2-ethylhexyl phosphate (UO₂X₂)_p (I) in C₆H₆ sulutions. Detailed interpretations of the³¹P NMR spectra and the v_as(POO) IR bands and determination of the fraction of nonequivalent phosphorus atoms of X⁻ anions and uranium (VI) atoms as well as the concentration of U(VI)-bonded TBP in I have shown that only a single TBP or DOSO molecule is coordinated to the uranium atoms of polymer I at C_TBP=0.1–2 M or C_DOSO=0.1–0.5 M. In the case of 100% TBP, two TBP molecules are coordinated to some U(VI) atoms. Distribution of TBP (DOSO) molecules along the polymer chain agrees with the mean statistical value. The portion of terminal chalate POO-groups of X⁻ anions is determined. The dependence of the degree of (UO₂X₂)_p·nL (L=TBP, DOSO) polymerization on C_L is obtained. Saturation of solutions with water only slightly affects the terminal POO-groups and has no effects on the distribution of L along the polymer chain of I. Institute of Catalysis, Siberian Branch, Russian Academy of Sciences. Translated fromZhurnal Strukturnoi Khimii, Vol. 35, No. 6, pp. 66–73, November–December, 1994. Translated by K. Shaposhnikova     

Chemical transformations of 3-methyl ethers of 14β-hydroxy-8α, 9β-D-homoestrone and 14α-hydroxy-9β-D-homoestrone

Conclusions Starting with the 3-methyl ether of 14-hydroxy-8,9-D-homoestrone (I) we synthesized the 3-methyl ethers of 8, 14-D-homoestrone (V) and 8, 9-D-homoestrone (III).Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2625–2627, November, 1972.     

Cyclization of 3-methoxy-Δ1,3,5,(10)-8,14-secoestratriene-14,17-dione

Conclusions Depending on the conditions, 3-methoxy-^1,3,5(10)-8,14-secoestratriene-14,17-dione (III) under the influence of acid agents is cyclized to estradiol, equilenol, 18-norequilenane, and cyclopentanophenanthrene derivatives. As a result, the spatial factor determines the course of the reaction even if the ⁹⁽¹¹⁾-double bond, which activates the H atoms at C₇, is absent.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1628–1632, July, 1973.     

Neutron activation determination of silver in rocks and minerals using organic sulfide extraction for silver separation

A rapid method for determination of silver in rocks and minerals by neutron activation was developed. The method is based on the quantitative and selective separation of silver by organic sulfide extraction.     

Structure and composition of the polymeric products of UO2SO4 extraction by benzene solutions of uranyl bis(2-ethylhexyl) phosphate

UO₂SO₄ extracts obtained from neutral aqueous solutions of this compound and benzene solutions of uranyl bis(2-ethylhexyl) phosphate have been studied by³¹P NMR and IR spectroscopy. It has been found that in the presence of donor-active additions L=TBP or DOSO the recurrent unit of the polymer (UO₂X₂)_p adds one or two UO₂SO₄ molecules to form {UO₂X₂·UO₂SO₄·2L} and {UO₂X₂·2UO₂SO₄·6L} units. The structure of these units has been established. It has been shown that the distribution of UO₂SO₄ molecules along the polymer chain is random. Institute of Catalysis, Siberian Branch, Russian Academy of Sciences. Translated fromZhumal Struktumoi Khimii, Vol. 36, No. 4, pp. 682–689, July–August, 1995. Translated by L. Smolina     

Palladium(II) extraction by sulfur-containing calix[4,6]arenes from hydrochloric acid solutions

The comparison of the extraction properties of calixarenes, thiacalixarenes, and calix[4,6]arene thioethers showed that methyl(thiamethyl)calix[4,6]arenes 3a and 4a have the highest extraction abilities. These extractants rapidly and completely extract palladium from hydrochloric acid solutions; regarding distribution factors achieved in the kinetic mode, they three to four orders of magnitude exceed their monodentate analogue, octylbenzyl sulfide (OBnS). Approaches are considered to enhance palladium extraction via generating mixed palladium species in low-acidity solutions and via intramolecular catalysis by the protonated oxygen atoms of alkoxy groups in the lower rim. For 1 M HCl, the kinetic order of diluent effects on palladium extraction was established. The substitution of sulfur atoms for bridging CH₂ groups was discovered to enhance palladium extraction by calix[4]arene thioether 3c.     

Extraction of heterometallic complexes of ruthenium and nonprecious metals by phosphorylmethylated calix[4]arenes from nitrate solutions

Synergetic extraction of [RuNO(NO₂)₄OH]^2? by calix[4]arene phosphine oxides (L) in the form of Ru/M heterometallic complexes was studied in the presence of nonprecious metals (M²⁺). The main extraction laws were recognized for [M(NO₃)₂L _n ] and [RuNO(NO₂)₄OH])ML _m ], where M²⁺ = Zn²⁺, Cu²⁺, Co²⁺, or Ni²⁺ and n, m = 1 or 2; extraction constants were determined for these metals. The variation row of the extraction constants with varying metal (Zn²⁺ > Cu²⁺ > Co²⁺ > Ni²⁺) coincides with the Irving-Williams row. Two or three PO groups of extractant L and the OH and NO₂ groups of the ruthenium anion are coordinated to the M²⁺ atom in Ru/M complexes. The conditions for generation of the Ru/Zn complex and its complete extraction were optimized as applied to the extraction of fission ruthenium from nitrated nitric acid and imitation solutions.