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Article
Low-molecular-weight metabolies of wheat. I. Components of an ethereal extract of wheat leaves
The chromatographic separation of the components of an ethereal extract of the leaves of “Mironovskaya 808” wheat has been performed. The presence in wheat of phthalic acid and its dimethyl, diethyl, and dibut...
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Article
Mass spectrometry and stereochemistry of heterocyclic compounds (review)
The possibilities of the application of mass spectrometry for the determination of the orientation of substituents, the stereochemistry of ring fusion, and the configuration of an asymmetric heteroatom are exa...
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Article
Application of chromatographic mass spectrometry in the analysis of mixtures of the stereoisomers in the 1,2-dimethyl- and 1-ethyl-2-methyl-4-alkylperhydro-4-quinolol series
It is shown on the basis of a comparison of the mass-spectral data obtained by admission of the individual substances into the ion source through direct introduction and by introduction of mixtures of the ster...
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Article
Mass-spectrometric determination of the 4-center configuration in trans-linked 1,4-dialkyldecahydroquinolol-4′s
By studying molecular ion stabilities and values of the \(I_{[M - C_2 H_5 ]^ + } /I_{[M]^ + } \) ratio (the [M-C2H
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Article
Stereochemistry of 2, 7-disubstituted and 1,2,7-trisubstituted 4-alkyldecahydro-4-quinolols
The configurations of the 2 and 4 centers in 1,2,7-trimethyl-, 2,7-dimethyl-, and 1,2-dimethyl-7-tert-butyl-4-alkyldecahydro-4-quinolols were assigned on the basis of a comparison of theI[M-CH3] +/I [M] + and I[m...
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Article
Mass-spectrometric study of substituted 4-alkyldecahydro-4-quinolols and decahydro-4-quinolones
The primary fraction of the total ion current in the mass spectra of decahydro-4-quinolones and 4-alkyl-2-methyldecahydro-4-quinolols containing various substituents in the 1, 4, and 7 positions is due to frag...
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Article
Fragmentation of substituted 4-hydroxy-2-quinolones under the influence of electron impact
The general principles of the mass-spectral disintegration of 4-hydroxy-2-quinoline derivatives containing various substituents attached to the nitrogen in the 3 position were established. It was found that th...
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Article
Growth inhibitors in buds of Betula verrucosa
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Article
Mass spectrometric study of N-oxides of quinolysidine alkaloids of the matrine series
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The mass spectra of N-oxides of matrine, allomatrine, sophoridine, isosophoridine, sophocarpine, and isosopho...
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Article
Mass spectrometric criteria of the difference between primary, secondary, and tertiary higher aliphatic alcohols
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The peculiarities of fragmentation of primary, secondary, and tertiary alcohols under electron impact were th...
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Article
Some peculiarities of the mass spectra of trifluoroacetates of higher aliphatic primary alcohols
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On the basis of a study of the mass spectra of 15 trifluoroacetates of higher aliphatic primary alcohols of n...
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Article
Identification of higher aliphatic primary alcohols and their trifluoroacetates on the basis of an analysis of the mass spectrometric data
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An algorithm of the establishment of the structure of molecules of higher primary aliphatic alcohols using on...
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Article
Comparative mass-spectrometric investigation of quinolizidine alkaloids and cytisine, sparteine, and matridine derivatives
The low- and high-resolution mass spectra of pachycarpine, tetrahydrodesoxocytisine, matridine, α-isolupanine, tetrahydrocytisine, matrine, d-thermopsine, cytisine, and isosophoramine, as well as some of their st...
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Article
Correlation between the mass-spectrometric behavior and chromatographic mobility of epimeric 4-alkyl-1,2-dimethyl-trans-perhydroquinolol N-oxides
The dependence between the Chromatographic mobility, the character of the disintegration under electron impact, and the configuration at C(4) was found for epimeric N-oxides of 1,2-dimethyl-4-ethyl-,-4-vinyl-, an...
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Article
Mass-spectrometric study of completely substituted 1,3-dioxolanes
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A study of the mass spectra of the completely substituted 1,3-dioxolanes disclosed that the principal directi...
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Article
The structure of coculine and coculidine
It was established that the alkaloids coculine and coculidine are derivatives of D-homoindophenanthridine.
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Article
Mass-spectrometric determinaton of configuration of 2nd and 4th centers in the molecules of 4-substituted 1-ethyl-2-methylperhydro-4-quinolinols
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Article
Structures of the products of the reaction of penilloic acids with acid anhydrides
N4-Acylpenilloic acid lactam structures were assigned to the products of the reaction of penilloic acids with acid anhydrides on the basis of a chemical and physicochemical study.
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Article
Mass-spectrometric study of the cleavage products of 3,4-epoxytetrahydropyrans by amines
Only 4-methyl-3-amino-4-hydroxytetrahydropyrans are formed when the oxide ring of 4-methyl-3,4-epoxytetrahydropyran is opened by ammonia and amines. The structural isomers of 4-amino-3-hydroxy-and 3-amino-4-hy...
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Article
Influence of the substituent on the decomposition of molecular ions of aromatic compounds
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The mass spectra of certain C,N-diarylnitrones were studied, and it was established that the Brown correlatio...
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