· Molecular ion peak is fairly noticeable because an aromatic ring better stabilizes the molecular ion.
· If the aromatic ring is substituted by an alkyl group, a prominent peak is formed at m/z 91. This highly stabilized fragment is result from rearrangements.
· Next frequently observed peak at m/z 65 results from elimination of neutral acetylene molecule from tropylium ion.
· When alkyl group is longer than two carbon peak at m/z 92 is observed, accounts for hydrogen migration with elimination of neutral alkene molecule.
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