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Mass spectrometric study of six cyclic esters

He1, Nie, He

  • 1Department of Chemistry, Peking University, Beijing, China.

Rapid Communications in Mass Spectrometry : RCM
|May 29, 2000
PubMed
Summary

Researchers studied optically active cyclic esters with helical structures. They found that while fragment ion stability influences fragmentation pathways, it does not correlate with the compounds' optical activity.

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Area of Science:

  • Organic Chemistry
  • Spectrometry
  • Stereochemistry

Background:

  • Cyclic esters with helical structures can exhibit optical activity.
  • Understanding structure-activity relationships is crucial in chemistry.
  • Electron impact (EI) mass spectrometry is a common tool for analyzing molecular fragmentation.

Purpose of the Study:

  • To synthesize optically active cyclic esters with helical structures.
  • To investigate the relationship between the structures of these esters and their optical activities.
  • To elucidate the electron impact fragmentation mechanisms of these compounds.

Main Methods:

  • Synthesis of six optically active cyclic esters.
  • Analysis of electron impact fragmentation patterns.

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  • Utilized accurate mass measurements.
  • Employed mass analyzed ion kinetic energy spectrometry (MIKES).

    • Main Results:

    • Confirmed fragmentation patterns for the cyclic esters.
    • Demonstrated that the stability of fragment ions significantly influences fragmentation pathways.
    • No correlation was found between fragment ion stability and the optical activity of the esters.

    Conclusions:

    • The study characterized the EI fragmentation mechanisms of helical cyclic esters.
    • Fragment ion stability is a key factor in determining fragmentation pathways.
    • Optical activity in these helical structures is independent of the observed fragmentation patterns and ion stability.