The molecular ions of fluoro- and chloro-toluenes are shown to have undergone a ring-expansion rearrangement prior to fragmentation; in contrast, the bromo- and iodo-toluenes do not undergo such rearrangement prior to fragmentation.
A. N. H. Yeo and D. H. Williams, J. Chem. Soc. D, 1970, 886 DOI: 10.1039/C29700000886
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