The mass spectra of [18]annulene derivatives. Skeletal rearrangement upon electron impact

Abstract

The mass spectra of a series of [18]annulene derivatives are reported and discussed. The majority of fragmentation modes exhibited in these spectra are produced by well-defined skeletal reorganization. In the case of one compound, all the observed fragmentations occur as the result of skeletal rearrangement processes. This appears to be the first reported example of such a phenomenon.