By Terrence A. Lee
Mass spectrometry is likely one of the few strategies through which an natural compound will be uniquely pointed out. This booklet examines the translation of mass spectra of natural compounds at a degree acceptable to newcomers within the box. it's a truly written and hugely useful creation to mass spectral information, concentrating on a compound-related method of interpretation of mass spectra.
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Additional resources for A beginner's guide to mass spectral interpretation
As we have seen, the exact location of the double bond can be very difficult to determine unless other structural features are present in the molecule. Alkynes.
This mechanism accounts for the typical pattern shown by most alkanes: clusters of fragments separated by 14 amu. Please pay careful attention to the arrows shown in this and all other examples. A double headed arrow is used to show the movement of a pair of electrons. Single headed arrows are used to show the movement of a single electron. In general, linear alkanes will show significant intensity for the molecular ion peak. As the amount of branching increases, the intensity of the molecular ion peak will decrease, and when the molecule has significant branching the molecular ion may be undetectable.
Html 29/09/2003 Document Página 1 de 1 Page 38 Example 20 Cyclobutane (C4H8) The presence of a double bond increases the abundance of the CnH2n - 1+ and CnH2n+ series of ions. In general, the presence of a double bond will increase the abundance of the molecular ion for compounds with low molecular weights (Examples 14-18). The normal ionization site in an alkene is the double bond, as opposed to ionization at any C-C bond in the alkanes. 7). In propene (Example 15) the peak at m/z 27 is consistent with simple cleavage resulting in the loss of the methyl radical.
A beginner's guide to mass spectral interpretation by Terrence A. Lee