Fragmentation of phenyl radical cations in mass spectrometry What are the main fragmentation pathways and products of a phenyl radical cation in mass spectrometry ? I notice sometimes that there's a m/z = 51 peak after the m/z = 77 for phenyl radical cation; I assume due to loss of acetylene.
What about $\ce{phenyl^{*+} -&gt; Dewar\ benzene^{*+} -&gt; cyclobutadiene^{+*} + C2H2}$?