Chapter 15
Mass Spectrometry Fragmentation Methods
Spettrometria di Massa: Frammentazione di Alcani a Catena Lunga
The molecular ions of linear alkanes prefer to fragment at the carbon-carbon bond away from the end of the chain since the cleavage of an inner bond ...
Spettrometria di massa: Frammentazione di Alcani Ramificati
This lesson delves into the mass spectrometry of branched alkane fragmentation. Branched alkanes possess secondary or tertiary carbon atoms, which ...
Spettrometria di massa: frammentazione cicloalcano
In mass spectrometry, cycloalkanes exhibit distinct fragmentation patterns due to the inherent stability of their molecular ions compared to linear or ...
Spettrometria di Massa: Frammentazione degli Alcheni
Alkenes lose one electron from the unsaturated π bond upon ionization and form stable molecular ions. Further fragmentation of alkenes occurs through ...
Spettrometria di massa: frammentazione dei cicloalcheni
The molecular ions of cycloalkenes undergo fragmentation via a retro-Diels–Alder reaction.
The reaction proceeds via the cleavage of two ...
Spettrometria di massa: frammentazione degli alchini
The fragmentation of alkynes preferentially occurs at the carbon–carbon bond between the α and β carbon of the alkyne bond to generate a ...
Spettrometria di massa: frammentazione dell'alcol
Alcohols (R-OH) ionize to lose one non-bonded electron from the oxygen atom, forming molecular ions. Due to their tendency to fragment rapidly, the ...
Spettrometria di massa: frammentazione dei composti aromatici
Upon ionization, aromatic compounds generate a molecular ion that is observed as a prominent peak in their mass spectra. For example, the molecular ion ...
Spettrometria di massa: frammentazione delle ammine
Amines can be identified using mass spectroscopy based on their characteristic fragmentation patterns. The molecular ions of amines undergo fragmentation ...
Mass Spectrometry: Alkyl Halide Fragmentation
Chlorine isotopes exist as 35Cl and 37Cl in a 3:1 ratio, while bromine isotopes exist as 79Br and 81Br in a 1:1 ratio. The mass spectrum of alkyl halides ...
Spettrometria di Massa: Frammentazione di Aldeidi e Chetoni
In mass spectrometry, the fragmentation of aliphatic aldehydes and ketones generally occurs through three key mechanisms: α-cleavage, inductive ...
Spettrometria di Massa: Frammentazione di Acidi Carbossilici, Esteri e Ammidi
The fragmentation patterns observed for compounds such as carboxylic acids, esters, and amides in the mass spectra include ⍺-cleavage and McLafferty ...
Spettrometria di Massa a Ionizzazione Chimica (CI)
The molecular ion peak of a molecule in the mass spectrum provides vital information for molecular identification. However, conventional electron impact ...
Spettrometria di Massa a Ionizzazione Elettrospray (ESI)
Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional ...
Matrix-Assisted Laser Desorption Ionization (MALDI)
Matrix-assisted laser desorption ionization (MALDI) is a powerful analytical technique used in mass spectrometry. It enables the identification and ...
Personale delle biblioteche
Copyright © 2025 MyJoVE Corporation. Tutti i diritti riservati