studies in organic mass spectrometry. part 25. benzyl ion formation in chemical ionisation (methane or isobutane) of some ortho-alkylhetero-substituted diphenylcarbinols for part 24 see avellone g, ceraulo l, lamartina l, cosimelli b, spinelli d, zuppiroli l. rapid commun. mass spectrom. 1999; 13: 1360; this work also constitutes part 6 of the series ‘hydrogen-carbon, carbon-carbon double rearrangement induced by proximity effect’; for part 5 see ref.7.

Autor: Bongiorno, David, Ceraulo, Leopoldo, Lamartina, Liliana, Natoli, Maria Concetta
Zdroj: Rapid Communications in Mass Spectrometry; February 2000, Vol. 14 Issue: 4 p203-206, 4p
Abstrakt: The behaviour of some ortho-alkylhetero-substituted diphenylcarbinols, including deuterium labelled derivatives, under chemical ionisation (methane or isobutane) conditions has been investigated. It has been determined that ortho-alkylhetero diphenylmethyl cations formed by water elimination from the protonated molecule undergo consecutive rearrangements which afford benzyl (or tropylium) ions previously observed for ortho-substituted diphenylcarbenium ions generated by electron ionisation. This reaction also occurs under low-energy collision conditions. Copyright © 2000 John Wiley & Sons, Ltd.
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