Mass Spectroscopy, Example #5
Analysis: C5H8O2 MW = 100.12
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From the molecular formula, the compound has "2 degrees of unsaturation" (two double bonds, carbonyls or rings).
Fragmentation of Common Functional Groups
The spectrum shows a small molecular ion peak, and a pair of peaks at m/e = 57 and 58. The peak at m/e = 57 corresponds to loss of m/e = 43, which is the base peak and corresponds to the acylium ion (CH3CO+). The m/e = 57 fragment corresponds to C3H5O, suggesting the original compound was an ester with this molecular formula.
Common Ions and Fragments