Ambiguousness of GC-MS identification of spiro[2.4]hepta-4,6-diene in natural objects

Менчиков, Л. Г.; Нефедов, О. М.; Зенкевич, И. Г.

doi:10.1007/s11172-017-1761-4

Cited by 5 publications

(2 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is caused by objectively higher information content of the mass spectra compared with one‐dimensional chromatographic data . Nevertheless, just chromatographic data appeared to be useful in identification of analytes with undistinguishable mass spectra, namely, isomers (see examples in the Introduction). Thus, the search for approaches of really joint interpretation of MS and GC data seems highly desirable.…”

Section: Resultsmentioning

confidence: 99%

“…However, the verification of these results using GC RIs indicates that these data belong to four different hydrocarbons with similar mass spectra . Another paradox is the identification of a rather “exotic” bicyclic hydrocarbon, spiro[2.4]hepta‐4,6‐diene, which was reported more than ten times in different natural objects during 2010–2016 . The reason for errors in this case is the similarity of the mass spectra of this compound (C 7 H 8 ) and such isomeric petroleum hydrocarbons as toluene…”

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Comparative gas chromatographic/mass spectrometric characterization of di‐ and trialkyl phosphites

Зенкевич

Nosova

2019

Rapid Comm Mass Spectrometry

View full text Add to dashboard Cite

Rationale: Homologous series of alkyl esters of phosphorus-containing acids, namely, dialkyl phosphonates (synonym: dialkyl phosphites) and trialkyl phosphites, were characterized by electron ionization (EI) mass spectra and gas chromatographic retention indices (GC RI) on semi-standard non-polar stationary phases. It is confirmed that GC/MS characterization of any sets of homologues should not be restricted to independent registration of these analytical parameters. Their joint processing in the form of so-called homologous increments of GC RIs means, firstly, a novel way of evaluating the chromatographic polarity of analytes and, secondly, a new algorithm for the prediction of their molecular weights if no peaks of molecular ions are registered in the mass spectra. Methods:A standard GC/MS technique, including determination of GC RIs on semi-standard nonpolar stationary phases in temperature-programmed regime and electron ionization (EI) mass spectra was used.Results: A total of 31 dialkyl phosphonate homologues and 37 trialkyl phosphite homologues were characterized by EI mass spectra and GC RIs for the first time.Joint processing of these analytical parameters allows the calculation of so-called homologous increments of GC RIs, which are useful parameters for evaluating the chromatographic polarity of analytes and predicting their molecular weights.Conclusions: GC/MS characterization of any sets of homologues should not be restricted to independent registration of the mass spectra and chromatographic retention parameters. Their joint processing in the form of so-called homologous increments of GC retention indices means, firstly, a novel way of evaluating the chromatographic polarity of analytes and, secondly, a new algorithm for predicting their molecular weights.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Comparative gas chromatographic/mass spectrometric characterization of di‐ and trialkyl phosphites

Зенкевич

Nosova

2019

Rapid Comm Mass Spectrometry

View full text Add to dashboard Cite

show abstract

Recent advances in the catalytic cyclopropanation of unsaturated compounds with diazomethane

Менчиков¹,

Shulishov²,

Tomilov³

2021

Russ. Chem. Rev.

View full text Add to dashboard Cite

The main achievements and development trends of the past 10–15 years related to the catalytic cyclopropanation of unsaturated compounds with diazomethane are integrated and analyzed. The attention is focused on the most efficient catalysts based on palladium compounds. Data on the effects of substrate structure and nature of catalyst components on the regio- and stereoselectivity of these reactions are systematized. Characteristic features of safe methods for diazomethane generation are considered, including the use of membrane technologies and continuous-flow and in situ preparation methods, which have prospects for industrial application. The bibliography includes 281 references.

show abstract

Characterization of Dialkyl Phosphites by Gas Chromatography–Mass Spectrometry

Зенкевич

Nosova

2018

J Anal Chem

View full text Add to dashboard Cite

Ambiguousness of GC-MS identification of spiro[2.4]hepta-4,6-diene in natural objects

Cited by 5 publications

References 24 publications

Comparative gas chromatographic/mass spectrometric characterization of di‐ and trialkyl phosphites

Comparative gas chromatographic/mass spectrometric characterization of di‐ and trialkyl phosphites

Recent advances in the catalytic cyclopropanation of unsaturated compounds with diazomethane

Characterization of Dialkyl Phosphites by Gas Chromatography–Mass Spectrometry

Contact Info

Product

Resources

About