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Search Publications by: Nino G Todua (Assoc)

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Displaying 1 - 8 of 8

Unusual Regularity in GC Retention of Simple Amino Acid Derivatives

August 8, 2019
Author(s)
Anzor I. Mikaia, Nino G. Todua, Zenkevich G. Igor
Background. Application of simple regularities and the general principles along with direct use of reference retention index data is a useful approach for reliable structure determination of compounds by GC-MS. Objective. Interpretation of anomaly in

Mass Spectrometry of Analytical Derivatives. 2. “Ortho” and “Para” Effects in Electron Ionization Mass Spectra of Derivatives of Hydroxyl, Mercapto and Amino Benzoic Acids

May 1, 2016
Author(s)
Nino G. Todua, Anzor I. Mikaia
Derivatives requiring either anhydrous or aqueous reaction conditions were prepared for robust and reliable gas chromatography – mass spectrometry (GC-MS) characterization of hydroxyl, mercapto, and amino benzoic acids. Methylation and trialkylsilylation

Electron Ionization Mass Spectra of Alkylated Sulfabenzamides

March 30, 2011
Author(s)
Nino G. Todua, Kirill V. Tretyakov, Roman S. Borisov, Dmitry I. Zhilyaev, Vladimir G. Zaikin, Stephen E. Stein, Anzor I. Mikaia
Mono-, di- and trialkyl derivatives of "sulfabenzamide" (N-4-aminophenylsulfonyl-benzamide) are prepared and their EI mass spectra are examined. It is found that the fragmentation of N- alkylsulfabenzamides (Alkyl = CH3 to n-C5H11) proceeds via a very

Unique para-effect in electron ionization mass spectra of bis(perfluoroacyl) derivatives of bifunctional aminobenzenes

September 15, 2010
Author(s)
Kirill V. Tretyakov, Nino G. Todua, Roman S. Borisov, Vladimir G. Zaikin, Stephen Stein, Anzor I. Mikaia
A new kind of "para-effect" under EI conditions has been discovered for a series of bis(perfluoroacyl) derivatives of o-, m- and p- phenylendiamines, hydroxybenzeneamines and mercaptobenzeneamines of a common structure RCOX C 6H 4 NHCOR (X = NH, S, O; R =