Abstract

AbstractUnusual behaviour has been noted for allyl methyl ether (1) chemically ionized in a high‐pressure ion source. Tandem mass spectrometry indicates the formation of methylcyclopentadienyl and methoxy‐1‐propenylcarbenium ions (d, m/z 81 and e, m/z 85). The origin of these unexpected ions has been elucidated using conventional and Fourier transform ion cyclotron resonance experiments: primary fragment ions derived from protonated 1 (allyl ions a and methoxymethyl cations b) generate collision complexes with neutral 1, giving rise to the ions d and e, respectively, after methanol elimination.

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