Compounds of aziadamantane type: Mass spectrometric study

1989 ◽  
Vol 54 (3) ◽  
pp. 691-698 ◽  
Author(s):  
Sergei D. Isaev ◽  
Nataliya F. Karpenko ◽  
Aleksandr G. Yurchenko ◽  
Luděk Vodička ◽  
Valentin I. Kadentsev ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Mass Spectrometric Study ◽  
Nitrogen Molecule ◽  
Molecular Ions ◽  
Mass Spectrometric ◽  
Spectrometric Study ◽  
Molecular Ion ◽  
Mechanism Of Decomposition ◽  
Derivatives Of ◽  
Type Mass

Azi and hydrazi derivatives of adamantane,adamantanone and diamantane were studied by mass spectrometry. The EI spectra of azi derivatives lack completely molecular ions; the presence of abundant dehydroadamantane or dehydrodiamantane ions corresponds to elimination of nitrogen molecule from the molecular ion. Comparison of the EI ionization with photolysis or pyrolysis allowed to deduce some analogies and to suggest the mechanism of decomposition of the molecular ion.

ChemInform Abstract: Mass-spectrometric Study of Some Derivatives of 2,6-Dimethyloxazolo[4,5-d]pyrimidines.

1983 ◽  
Vol 14 (9) ◽  
Author(s):  
R. G. MITZOYAN ◽  
K. E. BASENTSYAN ◽  
P. B. TERENT'EV ◽  
R. G. MELIKOGANDZHANYAN ◽  
T. A. KHACHATURYAN
Keyword(s):  
Mass Spectrometric Study ◽  
Mass Spectrometric ◽  
Spectrometric Study ◽  
Derivatives Of

Mass spectrometry of the vapours over PbBr2+MBr mixtures (M = Na, K, Rb, Cs)

1971 ◽  
Vol 24 (10) ◽  
pp. 2001 ◽  
Author(s):  
H Bloom ◽  
RG Anthony
Keyword(s):  
Mass Spectrometry ◽  
General Formula ◽  
Mass Spectrometric Study ◽  
Mass Spectrometric ◽  
Enthalpies Of Formation ◽  
Second Law ◽  
Spectrometric Study ◽  
Complex Molecules ◽  
Bipyramidal Structure

A mass spectrometric study of vapours above molten PbBr2+MBr mixtures has revealed the existence of vapour species of general formula MPbBr3 (M = Na, K, Rb, Cs). Second-law enthalpies of formation of these complexes were found to be in the range -39 to -44 kcal/mol; entropies of formation are estimated between -20 to -21 e.u. It is believed that these complex molecules have a bipyramidal structure.

scholarly journals Gas chromatographic-mass spectrometric study of metabolites of C21 and C19 steroids in neonatal porcine testicular microsomes

1985 ◽  
Vol 227 (3) ◽  
pp. 909-916 ◽  
Author(s):  
T K Kwan ◽  
N F Taylor ◽  
D Watson ◽  
D B Gower
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Mass Spectrometric Study ◽  
Mass Spectrometric ◽  
Spectrometric Study ◽  
Selected Ion Monitoring ◽  
17 Hydroxyprogesterone ◽  
Porcine Testis ◽  
Steroid Pathway ◽  
Chromatographic Mass

Microsomal fractions obtained from testes of 3-week-old piglets have been incubated, separately, with progesterone, 17-hydroxyprogesterone, 5-pregnene-3 beta,20 beta-diol, 16 alpha-hydroxypregnenolone, 5-androstene-3 beta,17 alpha-diol and dehydro-epiandrosterone. The metabolites, after derivatization, have been separated by capillary gas chromatography and identified by mass spectrometry. Quantification was by selected ion monitoring. Progesterone was shown to be 17-hydroxylated and also converted into 4,16-androstadien-3-one (androstadienone). The major metabolite of 17-hydroxyprogesterone was 4-androstene-3,17-dione (4-androstenedione), but little, if any, androstadienone was formed, indicating that this particular biosynthesis did not require 17-hydroxylation. The metabolites of 5-pregnene-3 beta, 20 beta-diol were found to be 17-hydroxypregnenolone, 3 beta-hydroxy-5,16-pregnadien-20-one (16-dehydropregnenolone) and 5,16-androstadien-3 beta-ol. Dehydroepiandrosterone and 5-androstene-3 beta,17 alpha-diol were interconvertible but neither steroid acted as a substrate for 16-androstene formation. However, dehydroepiandrosterone was metabolized to a small quantity of 4-androstenedione. Under the conditions used, no metabolites of 16 alpha-hydroxypregnenolone could be detected. The present results, together with those obtained earlier, indicate that the neonatal porcine testis has the capacity to synthesize weak androgens, mainly by the 4-en-3-oxo steroid pathway. Although 16-androstenes cannot be formed from C19 steroids, progesterone served as a substrate and may be converted directly to androstadienone, without being 17-hydroxylated first. The pathway to 5,16-androstadien-3 beta-ol, however, involves 17-hydroxypregnenolone and 16-dehydropregnenolone as intermediates.

ChemInform Abstract: MASS-SPECTROMETRIC STUDY OF NITRO DERIVATIVES OF 2(4)-AZAFLUORENES AND AZAFLUORENONES

1981 ◽  
Vol 12 (50) ◽  
Author(s):  
V. K. SHEVTSOV ◽  
P. I. ZAKHAROV ◽  
V. P. ZVOLINSKII ◽  
V. G. PLESHAKOV ◽  
G. V. GRIGOR'EV ◽  
...  
Keyword(s):  
Mass Spectrometric Study ◽  
Mass Spectrometric ◽  
Spectrometric Study ◽  
Nitro Derivatives ◽  
Derivatives Of

Synthesis and NMR and mass spectrometric study of ammonioacetohydrazones of formylphenylboronic acids as novel ionic prospective sugar receptors

2015 ◽  
Vol 39 (6) ◽  
pp. 4695-4707 ◽  
Author(s):  
Grażyna Bartkowiak ◽  
Łukasz Popenda ◽  
Stefan Jurga ◽  
Grzegorz Schroeder
Keyword(s):  
Mass Spectrometry ◽  
Mass Spectrometric Study ◽  
Maldi Mass Spectrometry ◽  
Mass Spectrometric ◽  
Spectrometric Study ◽  
Receptor Molecule ◽  
Ionic Group ◽  
Sugar Receptors

We report sugar receptors in which the sensitivity of detection through MALDI mass spectrometry is enhanced due to the introduction of an ionic group to the receptor molecule.

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