Trimethylsilyl derivatives of phenols and aniline give peaks in their mass spectra for tropylium and substituted tropylium ions and have the M– 15 peaks as the base peak.
R. H. Cragg, K. J. A. Hargreaves, J. F. J. Todd and R. B. Turner, J. Chem. Soc., Chem. Commun., 1972, 336 DOI: 10.1039/C39720000336
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