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Mass Spectrometry: Carboxylic Acid, Ester, and Amide Fragmentation01:01

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The fragmentation patterns observed for compounds such as carboxylic acids, esters, and amides in the mass spectra include ⍺-cleavage and McLafferty rearrangement. Fragmentation by ⍺-cleavage preferentially occurs at the carbon-carbon bond at the ⍺-position next to the carboxylic group to generate a neutral radical and a cation. Long chain compounds with hydrogen at their γ-carbon undergo McLafferty rearrangement to give a radical cation and a neutral alkene.
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Upon ionization, aromatic compounds generate a molecular ion that is observed as a prominent peak in their mass spectra. For example, the molecular ion peak for benzene appears at a mass-to-charge ratio of 78, while toluene is observed at a mass-to-charge ratio of 92. The molecular ion benzene is highly stable and does not readily undergo further fragmentation due to the significant amount of energy required to disrupt the aromatic stability of the benzene ring. In contrast, the molecular ion...
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Mass Spectrometry: Molecular Fragmentation Overview

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The ionization of a molecule into a molecular ion inside the mass spectrometer causes instability in the molecule's structure due to the loss of an electron. This eventually leads to the fragmentation or breaking of some bonds in the molecule. The fragmentation occurs predominantly at specific bonds to yield relatively stable fragments.
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In mass spectrometry, cycloalkanes exhibit distinct fragmentation patterns due to the inherent stability of their molecular ions compared to linear or branched alkanes. The ring structure of cycloalkanes provides additional stability to the molecular ions, often resulting in prominent ion peaks in the mass spectrum.
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An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a low-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.
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Mass Spectrometry: Overview01:19

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Mass spectrometry is an analytical technique used to determine the molecular mass and molecular formula of a compound. The basic principle of mass spectrometry is to generate ions from the analyte molecule and measure these ion abundances against their molecular mass.  One common type of ionization, known as electrospray ionization or EI, bombards the analyte molecules in the gas phase with high-energy electron beams. The electron beams displace an electron from the molecule and leave...
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Understanding zwitterionic ring-expansion polymerization through mass spectrometry.

Mahi Ahmad1, Scott M Grayson1

  • 1Department of Chemistry, Tulane University, New Orleans, Louisiana, USA.

Mass Spectrometry Reviews
|April 1, 2024
PubMed
Summary
This summary is machine-generated.

Zwitterionic ring-expansion polymerization (ZREP) synthesizes cyclic polymers via zwitterionic intermediates. This review highlights mass spectrometry

Keywords:
mass spectrometrymatrix‐assisted laser desorption/ionization time‐of‐flight mass spectrometrymechanismring‐opening polymerizationzwitterionic ring‐expansion polymerization

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Area of Science:

  • Polymer Chemistry
  • Organic Synthesis
  • Analytical Chemistry

Background:

  • Zwitterionic ring-expansion polymerization (ZREP) is a versatile method for cyclic polymer synthesis.
  • Understanding the reaction mechanism and product architecture is crucial for controlling polymer properties.

Purpose of the Study:

  • To review the ZREP of various cyclic polymers.
  • To explore the role of mass spectrometry in characterizing ZREP products.
  • To discuss catalyst efficiency in ZREP reactions.

Main Methods:

  • Review of literature on ZREP of cyclic polyesters, polyamides, and polyethers.
  • Analysis of mass spectrometry techniques, particularly MALDI-TOF MS, for polymer characterization.
  • Discussion of catalyst performance, including N-heterocyclic carbenes and tris(pentafluorophenyl)borane.

Main Results:

  • MALDI-TOF MS is effective for determining molecular weight in low dispersity polymers (Đ < 1.2).
  • N-heterocyclic carbenes are efficient catalysts for cyclic polyester and polyamide ZREP.
  • Tris(pentafluorophenyl)borane is optimal for cyclic polyether synthesis.

Conclusions:

  • ZREP offers a pathway to diverse cyclic polymers.
  • Mass spectrometry is essential for elucidating ZREP mechanisms and product structures.
  • Catalyst selection significantly impacts ZREP efficiency and purity.