Abstract
AbstractAdditional evidence for the rearrangement of the 1‐ and 3‐phenylcyclobutene radical cations, their corresponding ring‐opened 1,3‐butadiene ions and 1,2‐dihydronaphthalene radical cations to methylindenetype ions has been obtained for the decomposing ions by mass analysed ion kinetic energy spectroscopy (MIKES). The nature of the [C9H7]+ and [C10H8]+˙ daughter ions arising from the electron ionization induced fragmentation of these [C10H10]+˙ precursors has been investigated by collisionally activated dissociation (CAD), collisional ionization and ion kinetic energy spectroscopy. The [C9H7]+ produced from the various C10H10 hydrocarbons are of identical structure or an identical mixture of interconverting structures. These ions are similar in nature to the [C9H7]+ generated from indene by low energy electron ionization. The [C10H8]+˙ ions also possess a common structure, which is presumably that of the maphthalene radical cation.
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