Перегляд за Автор "Shestaka, A. A."

Зараз показуємо 1 - 5 з 5
  • Ескіз
    Документ
    Condensation of Acetamide in Aqueous Solutions in the Presence of Sulfur(IV) Dioxide
    (2009) Khoma, Ruslan E.; Mazepa, A. V.; Shestaka, A. A.; Ennan, Alim-Abdul A.; Gelmboldt, V. O.; Хома, Руслан Євгенійович
    The reactions leading to formation of cyclic structures are not typical for amides, in distinct to their thio analogs that under the conditions of acid catalyzed hydrolysis are prone to cyclization processes with formation of N,S-containing heterocycles [1–3].
  • Ескіз
    Документ
    Features of Interaction in the Sulfur(IV) Oxide–Hexamethylenetetramine–Water System: A First Example of Identification of the Product with a Sulfur–Carbon Bond
    (2011) Khoma, Ruslan E.; Shestaka, A. A.; Shishkin, O. V.; Baumer, Vyacheslav N.; Brusilovskii, Yu. E.; Koroeva, L. V.; Ennan, Alim-Abdul A.; Gelmboldt, V. O.; Хома, Руслан Євгенійович
    Hexamethylenetetramine (HMTA) is a ligand in the synthesis of coordination compounds and also is used as a pharmaceutical antiseptic drug and as hexogen precursor
  • Ескіз
    Документ
    On Interaction of Sulfur(IV) Oxide with Aqueous Solutions of Ethanolamines
    (2012) Khoma, Ruslan E.; Shestaka, A. A.; Gelmboldt, V. O.; Хома, Руслан Євгенійович
    Potentio- and conductometric titration was used to study the interaction in sulfur(IV) oxide– ethanolamines–water systems in comparison with the previously obtained pH-metric data on how the corresponding onium sulfi tes, hydrosulfi tes, and pyrosulfi tes are formed. The ionic and molecular compositions of these solutions were calculated. Correlations between the characteristics of pH-metric titration curves of aqueous solutions of ethanolamines with sulfur(IV) oxide and the relative stability of onium sulfates were revealed.
  • Ескіз
    Документ
    Synthesis, Spectral Characteristics, and Some Properties of Methylammonium Sulfamate Monohydrate. A New Route to Sulfamic Acid Derivatives
    (2010) Khoma, Ruslan E. ; Mazepa, A. V.; Gelmboldt, V. O.; Shestaka, A. A.; Koroeva, L. V.; Tsapko, M. D.; Ennan, Alim-Abdul A.; Хома, Руслан Євгенійович
    Redox transformations of the products of reactions of the CH3C(S)NH2–SO2–H2O system components yield methylammonium sulfamate monohydrate [CH3NH3]+[OSO2NH2]– ⋅ H2O and elemental sulfur. The synthesized compound was characterized by IR, 1H and 13C NMR, and mass spectroscopy and some of its properties were studied.
  • Ескіз
    Документ
    Взаимодействие оксида серы (IV) с водными растворами моноэтаноламина
    (Одеський національний університет імені І. І. Мечникова, 2010) Хома, Руслан Евгеньевич; Шестака, А. А.; Гельмбольдт, В. О.; Хома, Руслан Євгенійович; Шестака, О. О.; Гельмбольдт, В. О.; Khoma, Ruslan E. ; Shestaka, A. A.; Gelmboldt, V. O.
    Показано, что ход кривых рН-метрического титрования водных растворов моноэтаноламина (МЭА) газообразным SO2 имеет аналогичный характер. Предложена схема процессов, реализующихся в реакционной системе SO2 — МЭА — Н2О. Хемосорбция завершается при мольном соотношении SO2:МЭА = n:m (n=1,1ё1,2; m = 1,0) и рН 2,10ё2,40.